We use cookies to show content based on your preferences. If you continue to browse you accept their use and installation. More information. >

FMF - Friends of Minerals Forum, discussion and message board
The place to share your mineralogical experiences


Spanish message board






Newest topics and users posts
28 Mar-09:37:50 Re: 2 unknowns co-occurring with caledonite, grand reef mine, az (Cfrench58)
27 Mar-19:47:08 Re: 2 unknowns co-occurring with caledonite, grand reef mine, az (Pete Richards)
27 Mar-16:15:44 Re: 2 unknowns co-occurring with caledonite, grand reef mine, az (Cfrench58)
27 Mar-15:18:59 Re: 2 unknowns co-occurring with caledonite, grand reef mine, az (Alfredo)
27 Mar-14:39:29 2 unknowns co-occurring with caledonite, grand reef mine, az (Cfrench58)
27 Mar-05:21:48 Re: the mim museum in beirut, lebanon (Mim Museum)
27 Mar-05:03:26 Re: trying to find information on rose/pink quartz and tourmaline associations. (Ning)
27 Mar-02:39:50 Re: the mim museum in beirut, lebanon (Tobi)
27 Mar-00:23:28 Re: collection of volkmar stingl (Volkmar Stingl)
26 Mar-00:53:41 Re: collection of volkmar stingl (Volkmar Stingl)
25 Mar-13:32:10 Re: collection of michael shaw (Michael Shaw)
25 Mar-00:25:58 The mizunaka collection - quartz (Am Mizunaka)
23 Mar-13:35:22 Re: collection of firmo espinar (Firmo Espinar)
22 Mar-08:32:28 Re: collection of michael shaw (Michael Shaw)
22 Mar-04:20:41 Re: the mim museum in beirut, lebanon (Mim Museum)
21 Mar-22:49:19 Re: green seam. Looks like it in a state of decay. (Ning)
21 Mar-22:47:40 Re: green seam. Looks like it in a state of decay. (Ning)
21 Mar-22:45:25 Re: green seam. Looks like it in a state of decay. (Ning)
21 Mar-15:34:23 Re: the mizunaka collection - quartz (Am Mizunaka)
21 Mar-14:35:08 Re: jim’s mineral collection (Jim Wilkinson)
21 Mar-14:15:36 The 4th phoenix heritage mineral show (phms) hosted by mineralogical society of arizona (m (Chris Whitney-smith)
21 Mar-04:36:10 Re: the mizunaka collection (Tobi)
21 Mar-04:11:47 Re: jim’s mineral collection (James Catmur)
20 Mar-23:34:15 The mizunaka collection - quartz (Am Mizunaka)
20 Mar-18:13:16 Re: jim’s mineral collection (Jim Wilkinson)

For lists of newest topics and postings click here


RSS RSS

View unanswered posts

Why and how to register

Index Index
 FAQFAQ RegisterRegister  Log inLog in
 {Forgotten your password?}Forgotten your password?  

Like
111802


The time now is Mar 28, 2024 11:11

Search for a textSearch for a text   

A general guide for using the Forum with some rules and tips
The information provided within this Forum about localities is only given to allow reference to them. Any visit to any of the localities requires you to obtain full permission and relevant information prior to your visit. FMF is strictly against any illicit activities related to collecting minerals.
Preparing a list of light sensitive minerals - (14)
  Goto page Previous  1, 2, 3, 4, 5
  Index -> Featured Columns of FMF
Like
7


View previous topic :: View next topic  
Author Message

ellencmoe




Joined: 02 Aug 2010
Posts: 35
Location: Los Angeles, CA

View user's profile

Send private message

PostPosted: Jun 03, 2012 13:35    Post subject: Re: Preparing a list of light sensitive minerals - (14)  

This is a great topic.

My experience is very limited - mostly with pegmatite specimens from San Diego County, California, US.

Beryls can develop color when exposed to sun. I left a bucket of chunks of what I assumed were quartz in my yard. A few months later, one piece on top had developed a very nice aquamarine color. Unfortunately, a nice crystal from the 49-er pocket which is pale aquamarine on one corner, mostly colorless in the center, and pale peach morganite on the far corner, did not develop better color even when left in the sun all summer.

Spodumenes are also affected by sunlight, although I am not sure they always lose color. Kunzite has the nickname "The Evening Stone" since it may fade if exposed to sunlight/UV light. The pieces of spodumene I find on the old tailings from the Pala Chief Mine tends to be totally lacking color. But, the owner of the Oceanview Mine, also on Chief Mountain in Pala, California has experimented with some pieces of spodumeme he has been finding in abundance the last few years. A few of the beautiful purple Kunzites he left in the sun did not lose color. He also tried putting sunblock (sun tan lotion on pieces). The Oceanview Mine website www(dot)digforgems(dot)com may still have the results of his tests.

_________________
EllenMoe
Los Angeles, CA
Back to top
Reply to topic Reply with quote
Like
   

Carles Millan
Site Admin



Joined: 05 May 2007
Posts: 1463
Location: Catalonia


Access to the FMF Gallery title=

View user's profile

Send private message

PostPosted: Jun 03, 2012 13:50    Post subject: Re: Preparing a list of light sensitive minerals - (14)  

Snowman wrote:
I came across some copper sulfate minerals(Cant find the name) that were sitting in the shade. After about a few days i decided to collect some and once they were in the sunlight their colour faded within an hour.

Hi !

For the hydrated copper (II) sulphate to keep its typical blue color it has to retain all the five water molecules. If it loses some of the water, the color fades, and will eventually become white when anhydrous. Exposing it to the sun is an easy way to have it partially dehydrated.
Back to top
Reply to topic Reply with quote
Like
   

Maxilos




Joined: 02 Nov 2010
Posts: 191
Location: Boskoop, The Netherlands


Access to the FMF Gallery title=

View user's profile

Send private message

PostPosted: Jun 03, 2012 14:46    Post subject: Re: Preparing a list of light sensitive minerals - (14)  

I think this is a great topic for starters, and especially if they don't know everything about their specimens.

Mark

_________________
"Still looking for the philosopher's stone" => Dutch proverb
Back to top
Reply to topic Reply with quote
Like
   

Riccardo Modanesi




Joined: 07 Nov 2011
Posts: 618
Location: Milano

View user's profile

Send private message

PostPosted: Jun 04, 2012 08:41    Post subject: Re: Preparing a list of light sensitive minerals - (14)  

Hi!
From the photos of the (at present) two amethyst specimen I can't appreciate so big a difference in color! Maybe by seeing these specimen truly and not through a picture, the difference would be clearer.
Greetings from Italy by Riccardo.

_________________
Hi! I'm a collector of minerals since 1973 and a gemmologist. On Summer I always visit mines and quarries all over Europe looking for minerals! Ok, there is time to tell you much much more! Greetings from Italy by Riccardo.
Back to top
Reply to topic Reply with quote
Like
   

Olivier




Joined: 12 Oct 2020
Posts: 4
Location: Nevada

View user's profile

Send private message

PostPosted: Oct 23, 2020 09:22    Post subject: Re: Preparing a list of light sensitive minerals - (14)  

Out of curiosity, did this list ever see the light of day? (pun intended)
Back to top
Reply to topic Reply with quote
Like
   

James Catmur
Site Admin



Joined: 14 Sep 2006
Posts: 1340
Location: Cambridge


Access to the FMF Gallery title=

View user's profile

Send private message

PostPosted: Feb 11, 2024 07:07    Post subject: Re: Preparing a list of light sensitive minerals - (14)  

Good question - I am not sure it did. If needs someone to scrape the thread and then compile it
Back to top
Reply to topic Reply with quote
Like
   

James Catmur
Site Admin



Joined: 14 Sep 2006
Posts: 1340
Location: Cambridge


Access to the FMF Gallery title=

View user's profile

Send private message

PostPosted: Feb 11, 2024 07:14    Post subject: Re: Preparing a list of light sensitive minerals - (14)  

Asking an AI tool I got this response, with a few locality comments:

Here are some minerals known to be sensitive to light:

Apatite: Certain pink variants from Pakistan and Afghanistan exhibit light sensitivity.
Aragonite: This mineral, especially when it has color, can be light-sensitive.
Argentite: A silver mineral that may react to light exposure.
Calcite: Some calcite specimens from Elmwood, Tennessee, are sensitive to light.
Corundum: Yellow corundum (sapphire) can be light-sensitive.
Diamond: Various colored diamonds may exhibit light sensitivity.
Fluorapatite: Pink fluorapatite is known to be sensitive to light.
Fluorite: Numerous colors of fluorite can react to light.
Halite: Blue and yellow halite crystals may be light-sensitive.
Mercury Halides: These compounds containing mercury should be kept away from light.
Pyrostilpnite: A mineral that can be sensitive to light.
Sodalite: Blue sodalite may exhibit light sensitivity.
Spinel: Red spinel can react to light exposure.
Spodumene: Green spodumene may be sensitive to light.
Topaz: Brown, sherry, and blue topaz can be light-sensitive.
Tourmaline: Some pink and red tourmaline varieties may react to light.
Vivianite: Green and blue vivianite can be sensitive to light.
Xanthoconite: A mineral known for its light sensitivity.
Zircon: Brown zircon may react to light exposure.

Remember that sensitivity can vary based on specific localities and conditions. Proper care is essential to preserve the beauty and stability of these minerals.
Back to top
Reply to topic Reply with quote
Like
2
   

alfredo
Site Admin



Joined: 30 Jan 2008
Posts: 979


Access to the FMF Gallery title=

View user's profile

Send private message

PostPosted: Feb 11, 2024 10:42    Post subject: Re: Preparing a list of light sensitive minerals - (14)  

"Blue sodalite"? The AI seems to have messed up. At La Fuente, in Tucson, we've had barrels of blue sodalite from both Bolivia and Brazil siting out in the burning Arizona sun for years, with no change at all.

The hackmannite variety of sodalite, on the other hand, is extremely light sensitive, changing color in mere seconds, but that isn't blue.
Back to top
Reply to topic Reply with quote
Like
   

Jordi Fabre
Overall coordinator of the Forum



Joined: 07 Aug 2006
Posts: 4888
Location: Barcelona


Access to the FMF Gallery title=

View user's profile

Send private message

PostPosted: Feb 11, 2024 14:23    Post subject: Re: Preparing a list of light sensitive minerals - (14)  

And Argentite is a not existing mineral, at least at a human temperature 😏
Back to top
Reply to topic Reply with quote
Like
1
   

Peter Lemkin




Joined: 18 Nov 2016
Posts: 398
Location: Prague

View user's profile

Send private message

PostPosted: Feb 11, 2024 15:21    Post subject: Re: Preparing a list of light sensitive minerals - (14)  

list-in-progress [some repetition; some need more explanation.....

Apatite (pink from Pakistan, Afghanistan)
Aurivilliusite
Barite (blue)
Beryl (maxixe emerald)
Morganite
Bromargyrite
Calcite (from Elmwood, TN)
Aragonite (w/ color)
Celestine (blue)
Cinnabar
Corderoite (pink from the Cordero and McDermitt Mines)
Corundum (yellow)
Diamond (various colors)
Djurelite (from Mount Gabriel, County Cork, Ireland)
Feldspar
Microcline
Amazonite
Fluorapatite (pink)
Fluorite (numerous colors and localities)
Halite (blue, yellow)
Huantajayite (contains silver halides)
Mercury Halides
Pararealgar
Pyrostilpnite
Pyrargyrite
Proustite
Quartz
Amethyst (especially Brazilian amethyst)
Rose Quartz
Smokey Quartz
Realgar
Scapolite (violet)
Silver (native – can tarnish when exposed to light and moisture)
Silver Halides
Silver Halogenides
Sodalite (blue)
Hackmanite (salmon/pink)
Spinel (red)
Spodumene (green)
Kunzite
Tetrahedrite
Topaz (brown, sherry, blue)
Tourmaline (some pink, red)
Vanadinite
Vivianite (green, blue)
Xanthoconite
Zircon (brown)
------------------------
Anglesite (brown to colorless)
Anhydrite (blue to colorless)
Apatite (mauve or pink to colorless)
– Pakistan, Afghanistan* pink fades
– La Marina, Mine, Pauna, Boyacá Colombia* pink fades
– Moro Vehlo Mine, Nova Lima, Minas Gerais pink fades
– Himalaya Mine, CA
Aragonite (w/ color)
Argentite
Aurivilliusite
Barite (colorless or blue to darker; blue to colorless; yellow/brown to green or blue)
– “Hartsel” Barite can turn from white to blue in sunlight.
– Moscona Mine barite goes from white to blue in sunlight but reversible.
Beryl v Aquamarine*
– Blue beryl can be made irradiating certain pale natural beryls but like maxime, the electron trap is shallow and so unstable. Fe-colored aquamarines are perfectly stable.
Beryl v Emerald
Beryl v Maxixe* (Blue to colorless or pink)
Beryl v Morganite (apricot or purplish to pink; pink to paler pink)
– One Afghanistan find, pink beryl turned deep yellow with a few hours of sunlight.
– S. CA pegmatites, morganites would be left in the sun to “bring the pink up”
Brazilianite (green to colorless)
Bromargyrite (darkens, Ag liberated)
Calcite (colors fade)
– Elmwood, TN*
– Santa Eulalia (yellow ones from Santa Eulalia temporarily turn pinkish on 15-20 min exposure to sunlight, turn white permanently with 30-60 min exposure to sunlight.
Celestine (blue to colorless)
Chlorargyrite* (gray to violet-brown, Ag liberated)
Cinnabar (red to black metacinnabar)
Corderoite
– McDermitt (Cordero) Mine, NV, Pink Corderoite turns a mouse gray color
Corundum (yellow to colorless)
Crocoite
Creedite (purple creedites are VERY light sensitive)
Cuprite* (darkens, Cu liberated)
Diamond (yellow to green; red to pink)
Djurelite
– Mount Gabriel, County Cork, Ireland
Fayalite (green to blue)
Feldspar v Amazonite*
Fluorapatite (pink fades)
Fluorite (pink to colorless; green to purple; blue or purple to colorless or pink)
– Bingham, NM, blue will fade with exposure to sunlight.
– El Hamman, Morocco, Ink blue pales with 30 min direct sun exposure *
– Elmwood fluorite is reported to be stable.
– Haute-Loire, France, sky blue turns colorless with 30 min direct sunlight.
– Hilton yellow fluorite is reported to be stable.
– Navidad Mine, deep grape purple when mined, but miners put in sun for 6-9 weks to turn them pink.
– Sant Marçal, Montseny, Spain, deep blue turns dirty green with 1 hr direct sunlight exposure. *
– Weardale (Cowshill area), Pale green changed to purple almost immediately on exposure to daylight (not even direct sunlight!).
– Weardale (Rogerly, Heights, Cement Quarry, and the old White’s Level), green are all potentially unstable, though to varying degrees. Purple color appears more stable. Deep green fluorite from the Rogerly (Solstice Pocket) permanently changed almost instantly to a muddy gray-green if exposed to a LWUV lamp; this process took longer in sunlight.
Halite (blue or yellow may change)
– Huantajayite (argentian halite, contains silver halides)
– Searles lake, pink color from halophylic bacteria and algae fade with exposure to sun.
Haüyne (blue pales)
Hisingerite (red to brown)
Ianthinite (purple to greenish yellow)
Inesite
Kleinite (yellow to orange)
Lepidolite (purple to gray)
Marcasite (w/ high humidity – can speed up oxidation)
Metatyuyamunite (yellow to green)
Mercury Halides like Aurivilliusite
Miargyrite
Miersite (darkens, Ag liberated)
Mosesite (yellow to green)
Nepheline (pink to colorless)
Orpiment
Pabstite (pink to colorless)
Pararealgar*
Phenakite (red to pink)
– Lemon yellow phenakite from Mt Antero turned colorless after one day in sunshine.
– Orange/brown phenakite from the emerald/alexandrite deposits in the Urals turn colorless or white depending on inclusion content within hours or days if exposed to UV light.
Proustite*
Pyrargyrite
Pyrite (w/ high humidity, light can speed up oxidation)
Pyrostilpnite
Quartz (most colored quartz is light sensitive)
Quartz v Amethyst (fades)
– Brazilian amethyst
– Nebraska amethyst will bleach after a couple of days in the sun.
Quartz v Citrine
Quartz v Morion
Quartz v Rose* (fades)
Quartz v Smoky (smoky to greenish yellow to colorless)
Quartz v Agate
Quartz v Opal
Realgar* (red to yellow pararealgar)
– Realgar is only sensitive to green light
Rutile (pale to darker)
Scapolite (violet to colorless)
Selenite (pink fades)
Silver, native – can tarnish when exposed to light and moisture
Silver Halides (these generally darken and Ag is liberated)
Silver Sulfides/Sulfosalts like Miargyrite
Sodalite (blue)*
Sodalite v Hackmanite* (red to green, blue, or colorless)
Spinel (red)
Spodumene v Hiddenite
Spodumene v Kunzite (pink to colorless)
Stephanite
Tetrahedrite
Topaz* (brown to colorless or blue; blue to paler or colorless)
– Most Thomas Range, UT sherry topaz xtals turn colorless with exposure to sunlight.
– Some topaz xtals from east side of the Thomas Range, UT start out as sherry but turn pink after one to three weeks in the sun. This is due to an unusually high content of pseudobrokite inclusions. The pink is stable, at least after one year of leaving these in the sun.
– Some topaz from the Little Three Mine were collected as colorless but turned blue upon exposure to the sun. Blue crystals that came out of the 1976 and 1991 pockets became much more blue with exposure. This blue color appears stable.
– Sherry colored topaz from Villa Garcia, Zacatecas, Mexico is reported to have stable color.
– The sherry colored portions of topaz xtals from Mokrusha Mine, Urals fade and seem to turn light blue with exposure to sunlight.
– Volodarsk/Volhynsk, Ukraine topazes usually start out dark orange but fade quickly with exposure to sunlight. Bicolored samples found in some pockets (light pinkish champagne and blue) seem to be more stable (at least for 15 years).
Tourmaline (some pink, red)
Tuperssuatsiaite
– Tuperssuatsiaite specimens from Aris started out mauve but turned green.
Vanadinite (red or yellow to darker)
Vivianite (green, blue)*
Wulfenite
– Red Cloud wulfenites will fade over time
Xanthoconite
Zircon (brown)*
Back to top
Reply to topic Reply with quote
Like
1
   

Jordi Fabre
Overall coordinator of the Forum



Joined: 07 Aug 2006
Posts: 4888
Location: Barcelona


Access to the FMF Gallery title=

View user's profile

Send private message

PostPosted: Feb 11, 2024 15:33    Post subject: Re: Preparing a list of light sensitive minerals - (14)  

James Catmur wrote:
Good question - I am not sure it did. If needs someone to scrape the thread and then compile it

Scouring through the thread, I believe these two posts could be helpful in enhancing Peter's list:

https://www.mineral-forum.com/message-board/viewtopic.php?p=6890#6890

and

https://www.mineral-forum.com/message-board/viewtopic.php?p=8271#8271
Back to top
Reply to topic Reply with quote
Like
   

Peter Lemkin




Joined: 18 Nov 2016
Posts: 398
Location: Prague

View user's profile

Send private message

PostPosted: Feb 12, 2024 02:42    Post subject: Re: Preparing a list of light sensitive minerals - (14)  

Jordi Fabre wrote:
James Catmur wrote:
Good question - I am not sure it did. If needs someone to scrape the thread and then compile it

Scouring through the thread, I believe these two posts could be helpful in enhancing Peter's list:

https://www.mineral-forum.com/message-board/viewtopic.php?p=6890#6890

and

https://www.mineral-forum.com/message-board/viewtopic.php?p=8271#8271


Thanks. Anyone is welcome to work to combine the various sub-lists into one and annotate where necessary about certain locations or to explain for clarity. Not necessary, but a combined [or two separate] lists of 'light-effected' and 'heat-sensitive' minerals would be helpful - minerals that sometimes need special care in display, storage, etc. I'm not talking about intentional changing of the color of minerals mostly for gemological color.

I guess this could be made into a more complete project of 'minerals with special care needs': light sensitive; heat-sensitive; liable to chemically disintegrate (and methods to stabilize some); minerals that should not be near specific other minerals (or isolated), etc.

If one searches the internet there are some other such lists and if i remember Sinkankas made such a partial list in one of his books [I'd have, but no time to search through just now]. Must be a PhD Thesis out there somewhere on this.....;-)

Absolutely NOT needed, but for me of interest is the WHY/HOW some are sensitive to light; i.e., what mechanism light causes changes in. One must remember that all but surface minerals have spent thousands, millions or billions of years without light.
Back to top
Reply to topic Reply with quote
Like
1
   

James Catmur
Site Admin



Joined: 14 Sep 2006
Posts: 1340
Location: Cambridge


Access to the FMF Gallery title=

View user's profile

Send private message

PostPosted: Feb 12, 2024 08:25    Post subject: Re: Preparing a list of light sensitive minerals - (14)  

- Barite, La Unión, Murcia, Spain / white -> blue
Back to top
Reply to topic Reply with quote
Like
   
Display posts from previous:   
   Index -> Featured Columns of FMF   All times are GMT - 5 Hours
Page 5 of 5
  Goto page Previous  1, 2, 3, 4, 5  

 
Jump to:  
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
You cannot attach files in this forum
You can download files in this forum


All pictures, text, design © Forum FMF 2006-2024


Powered by FMF