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
02 Aug-23:55:17 Re: collection of volkmar stingl (Volkmar Stingl)
02 Aug-23:11:49 Re: don lum collection (Don Lum)
02 Aug-10:20:30 Re: stay at home - coronavirus / covid-19 (Roger Warin)
02 Aug-09:15:31 Re: collection of michael shaw (Michael Shaw)
02 Aug-00:58:34 Re: stay at home - coronavirus / covid-19 (Peter Lemkin)
01 Aug-14:31:32 Re: stay at home - coronavirus / covid-19 (Don Lum)
01 Aug-14:24:20 Re: stay at home - coronavirus / covid-19 (Riccardo Modanesi)
01 Aug-14:21:52 Re: collection of sante celiberti (Jordi Fabre)
01 Aug-09:27:00 Re: corona covid-19 virus - what is it ? where is it from ? (Roger Warin)
01 Aug-07:15:53 Re: collection of volkmar stingl (Volkmar Stingl)
01 Aug-06:48:22 Re: corona covid-19 virus - what is it ? where is it from ? (Peter Lemkin)
01 Aug-04:45:19 Re: corona covid-19 virus - what is it ? where is it from ? (R Saunders)
31 Jul-22:40:40 Corona covid-19 virus - what is it ? where is it from ? (Roger Warin)
31 Jul-16:32:56 Re: collection of firmo espinar (Firmo Espinar)
30 Jul-14:58:22 Re: melanophlogite? (Luiz Oliveira)
30 Jul-14:51:23 Re: about a rutile epitaxy on hematite in quartz (Roger Warin)
30 Jul-03:36:43 The mizunaka collection - quartz (Am Mizunaka)
29 Jul-22:49:31 Re: collection of volkmar stingl (Volkmar Stingl)
29 Jul-21:35:18 Re: about a rutile epitaxy on hematite in quartz (Alfredo)
29 Jul-14:10:03 Re: collection of michael shaw (Michael Shaw)
28 Jul-21:29:06 Re: about a rutile epitaxy on hematite in quartz (Roger Warin)
28 Jul-21:24:20 Re: unknown quartz? (Steveb)
28 Jul-21:23:26 About a rutile epitaxy on hematite in quartz (Roger Warin)
28 Jul-15:43:19 Unknown quartz? (R Saunders)
28 Jul-13:15:33 Re: collection of volkmar stingl (Volkmar Stingl)

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
84001


The time now is Aug 03, 2021 01:37

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.
What type of Tourmaline?
  
  Index -> FOR BEGINNERS: What is it? Where is it from?
Like
3


View previous topic :: View next topic  
Author Message

BridgetownTreasures




Joined: 03 Feb 2020
Posts: 9
Location: Oregon

View user's profile

Send private message

PostPosted: Mar 16, 2020 16:45    Post subject: What type of Tourmaline?  

Hi all - I have this piece of tourmaline from Northern California and I’m struggling to find the specific variety. It is pink-to-purple, with a lot of rainbow/iridescent refractions throughout.

Are there specific tests that will narrow down more than just “tourmaline”

Thanks for your patience with a beginner!



IMG_1325.jpg
 Mineral: Tourmaline
 Locality:
California, USA
 Dimensions: Approx. 5cm x 3.5cm
 Description:
Specimen is 66 grams
 Viewed:  7292 Time(s)

IMG_1325.jpg



IMG_1322.jpg
 Mineral: Tourmaline
 Locality:
California, USA
 Dimensions: Approx. 5cm x 3.5cm
 Description:
 Viewed:  7293 Time(s)

IMG_1322.jpg



IMG_1317.jpg
 Mineral: Tourmaline
 Locality:
California, USA
 Dimensions: Approx. 5cm x 3.5cm
 Description:
 Viewed:  7289 Time(s)

IMG_1317.jpg



IMG_1324.jpg
 Locality:
California, USA
 Dimensions: Approx. 5cm x 3.5cm
 Description:
 Viewed:  7289 Time(s)

IMG_1324.jpg



IMG_1316.jpg
 Mineral: Tourmaline
 Locality:
California, USA
 Dimensions: Approx. 5cm x 3.5cm
 Description:
 Viewed:  7288 Time(s)

IMG_1316.jpg



IMG_1320.jpg
 Mineral: Tourmaline
 Locality:
California, USA
 Dimensions: Approx. 5cm x 3.5cm
 Description:
 Viewed:  7289 Time(s)

IMG_1320.jpg



IMG_1321.jpg
 Mineral: Tourmaline
 Locality:
California, USA
 Dimensions: Approx. 5cm x 3.5cm
 Description:
 Viewed:  7292 Time(s)

IMG_1321.jpg



IMG_1313.jpg
 Mineral: Tourmaline
 Locality:
California, USA
 Dimensions: Approx. 5cm x 3.5cm
 Description:
 Viewed:  7296 Time(s)

IMG_1313.jpg


Back to top
Reply to topic Reply with quote
Like
   

Pete Richards
Site Admin



Joined: 29 Dec 2008
Posts: 748
Location: Northeast Ohio


Access to the FMF Gallery title=

View user's profile

Send private message

PostPosted: Mar 16, 2020 16:49    Post subject: Re: What type of Tourmaline?  

Most probably it's elbaite, given the color and California. Can you be more specific about where in Northern California it came from, and how you got it?

There are tests that can be done to determine the chemical composition, which defines the kind of tourmaline, but they are not cheap and it might be hard to find someone who could do them for you. Locality may be the best indicator.

_________________
Collecting and studying crystals with interesting habits, twinning, and epitaxy
Back to top
Reply to topic Reply with quote
Like
2
   

BridgetownTreasures




Joined: 03 Feb 2020
Posts: 9
Location: Oregon

View user's profile

Send private message

PostPosted: Mar 16, 2020 16:56    Post subject: Re: What type of Tourmaline?  

Thank you!

As I look at grandpa's chicken scratch (This piece came to me through a gorgeous collection I inherited - unfortunately the labeling is not good), there are two tourmaline entries. One says "N. Calif" and the other says "Mesa Grande". There is only one piece of tourmaline, so I'm not 100% sure which locale it is, which I know limits ID efforts.

Thank you again - I know that you are limited by my lack of info - even broad "musings" are if interest to me!
Back to top
Reply to topic Reply with quote
Like
   

Jesse Fisher




Joined: 18 Mar 2009
Posts: 591
Location: San Francisco


Access to the FMF Gallery title=

View user's profile

Send private message

PostPosted: Mar 17, 2020 00:05    Post subject: Re: What type of Tourmaline?  

There are few, if any locations for colored tourmaline (most likely elbaite) in Northern California. Mesa Grande, which is in San Diego County, is the location of the Himalaya Mine, which along with the nearby Pala District was a prolific source of the mineral for much of the 20th century.
Back to top
Reply to topic Reply with quote
Like
   

basti




Joined: 29 Mar 2012
Posts: 27
Location: Brno, Czech Republic

View user's profile

Send private message

PostPosted: Mar 17, 2020 04:23    Post subject: Re: What type of Tourmaline?  

The pink tourmaline is very likely elbaite or fluor-elbaite, pink tourmaline is labeled as variety rubellite. I have some analyses from Victor, Caterina, Himalaya and Stewart - all are elbaites.

The green layer outside on the pink tourmies is often very close to the border between lithium-rich schorl or iron-rich elbaite. Green variety is labeled as verdelite.

Finding precise locality based on geochemistry of tourmaline chunk alone is very difficult. They are very similar and many localities contain several lithium-turmaline generations.

For advanced collectors: Pink rubellite can be also darrellhenryite, rossmanite and couple other tourmalines - not sure if these were found in California so far. Also some schorls and less often dravites can be green, but these do not usually form in the LCT pegmatite core.
Back to top
Reply to topic Reply with quote
Like
1
   
Display posts from previous:   
   Index -> FOR BEGINNERS: What is it? Where is it from?   All times are GMT - 5 Hours
Page 1 of 1
    

 
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 2006-2021


Powered by FMF