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29 Jan-08:18:57 Re: tucson shows 2023 - let the fun begin (Minsur)
28 Jan-22:29:08 Re: tucson shows 2023 - let the fun begin (Bob Kerr)
28 Jan-22:10:34 Re: tucson shows 2023 - let the fun begin (Bob Kerr)
28 Jan-21:08:19 Re: tucson shows 2023 - let the fun begin (Bob Kerr)
28 Jan-20:44:47 Re: don lum collection (Don Lum)
28 Jan-18:35:22 Re: tucson shows 2023 - let the fun begin (Minsur)
28 Jan-15:22:59 Elte ttk museum of natural history (Robert Seitz)
28 Jan-11:59:23 Re: collection of tobi (Tobi)
28 Jan-11:07:47 Re: collection of volkmar stingl (Volkmar Stingl)
28 Jan-10:00:28 Re: collection of michael shaw (Michael Shaw)
28 Jan-08:52:06 Re: collection of tobi (Michael Shaw)
28 Jan-06:25:33 Re: collection of enrique llorens (Enrique Llorens)
28 Jan-06:09:11 Re: collection of enrique llorens (Enrique Llorens)
28 Jan-03:46:13 Re: collection of tobi (Tobi)
27 Jan-23:11:58 Re: tucson shows 2023 - let the fun begin (Bob Kerr)
27 Jan-22:55:21 Re: tucson shows 2023 - let the fun begin (Bob Kerr)
27 Jan-22:42:12 Re: tucson shows 2023 - let the fun begin (Bob Kerr)
27 Jan-22:28:50 Re: tucson shows 2023 - let the fun begin (Bob Kerr)
27 Jan-22:16:46 Re: tucson shows 2023 - let the fun begin (Bob Kerr)
27 Jan-22:11:51 Re: tucson shows 2023 - let the fun begin (Bob Kerr)
27 Jan-13:11:51 Re: museum der natur hamburg - mineralogie (Gagat Minerals)
27 Jan-11:59:26 Re: collection of enrique llorens (Enrique Llorens)
27 Jan-11:53:22 Re: collection of enrique llorens (Enrique Llorens)
27 Jan-11:06:38 Hungarian natural history museum - budapest (Robert Seitz)
27 Jan-04:20:30 Re: iolite and big quartz crystals from bc canada (Tobi)

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  Topic: Tucson Shows 2023 - let the fun begin
alfredo

Replies: 28
Views: 3567

PostForum: News about shows   Posted: Jan 26, 2023 15:40   Subject: Re: Tucson Shows 2023 - let the fun begin
Let's note too that Nature has no method for making loops of spheres like that. Spherules, whether their internal structure is radiating or concentric, start growing from a point in the center. How wo ...
  Topic: Tucson Shows 2023 - let the fun begin
alfredo

Replies: 28
Views: 3567

PostForum: News about shows   Posted: Jan 26, 2023 09:38   Subject: Re: Tucson Shows 2023 - let the fun begin
On line discussions of fluorite "loops" came to the conclusion that they are carvings made from the fluorite hemispheres that occur in India. Easy enough to do nowadays with the air abrasive ...
  Topic: Iolite and big quartz crystals from BC Canada
alfredo

Replies: 4
Views: 446

PostForum: Mines and Mineral Localities   Posted: Jan 25, 2023 21:56   Subject: Re: Iolite and big quartz crystals from BC Canada
Reminds me a lot about the Swiss "strahlers" in the Alps - same environment, same working conditions, same alpine-type quartz finds. Amazing.
  Topic: Cleaning Cookeite over pink Tourmaline
alfredo

Replies: 9
Views: 903

PostForum: Off-Topic and Introductions   Posted: Jan 15, 2023 12:47   Subject: Re: Cleaning Cookeite over pink Tourmaline
Get it professionally analysed and make sure it really is cookeite, and not the closely related species borocookeite! When the pink tourmalines from Malkhan in Siberia started coming out, dealers quic ...
  Topic: Cleaning Cookeite over pink Tourmaline
alfredo

Replies: 9
Views: 903

PostForum: Off-Topic and Introductions   Posted: Jan 14, 2023 00:18   Subject: Re: Cleaning Cookeite over pink Tourmaline
Cookeite is a member of the chlorite group, not a mica. I've dissolved other chlorites (clinochlore-chamosite) in hot sulphuric acid, but whether that would also work on cookeite, I'm not sure.
  Topic: Please identify.
alfredo

Replies: 8
Views: 879

PostForum: FOR BEGINNERS: What is it? Where is it from?   Posted: Jan 12, 2023 20:01   Subject: Re: Please identify.
The pink ones look like rose quartz.
  Topic: Any Ideas?
alfredo

Replies: 22
Views: 2577

PostForum: FOR BEGINNERS: What is it? Where is it from?   Posted: Dec 29, 2022 12:00   Subject: Re: Any Ideas?
Don't waste your money on a thermal conductivity "diamond tester". They are designed for use on the flat polished facets of gemstones and give very unreliable results on rough stones and cry ...
  Topic: Melanophlogite?
alfredo

Replies: 20
Views: 7410

PostForum: What is it? - Where is it from?   Posted: Dec 18, 2022 12:28   Subject: Re: Melanophlogite?
What you have there is concentric layers of iron oxide, nothing related to melanophlogite, chayesite, osumilite, nor cordierite. Indeed a curious rock - I'd keep it too if I found it - but nothing wit ...
  Topic: Found this today
alfredo

Replies: 14
Views: 1499

PostForum: FOR BEGINNERS: What is it? Where is it from?   Posted: Dec 13, 2022 09:02   Subject: Re: Found this today
https://www.mindat.org/mesg-506598.html
Sorry, it's a bit facetious, but...
  Topic: Found this today
alfredo

Replies: 14
Views: 1499

PostForum: FOR BEGINNERS: What is it? Where is it from?   Posted: Dec 12, 2022 20:33   Subject: Re: Found this today
It's not a diamond, so don't waste your money buying a diamond tester. They don't work reliably on rough surfaces anyway, they're designed for use on polished gemstone facets.
  Topic: Rockhounding in Israel - contact needed
alfredo

Replies: 18
Views: 26816

PostForum: Rockhounding trips   Posted: Dec 12, 2022 19:44   Subject: Re: Rockhounding in Israel - contact needed
Chalcedony/Quartz nodules are abundant on some parts of the slopes of Mt Meron, looking like cauliflower on the outside, occasionally with hollow centers. Nothing terribly exciting.
  Topic: Zunyite from Canada
alfredo

Replies: 6
Views: 1161

PostForum: Minerals and Mineralogy   Posted: Nov 30, 2022 12:54   Subject: Re: Zunyite from Canada
As David points out, "Silverstone" is likely an error for Silverton, and Silverton has plenty of sphalerite and chalcopyrite, which this specimen appears to be. It does not look to me like z ...
  Topic: Zunyite from Canada
alfredo

Replies: 6
Views: 1161

PostForum: Minerals and Mineralogy   Posted: Nov 28, 2022 18:38   Subject: Re: Zunyite from Canada
I too suspect sphalerite.
  Topic: Minerals to be found in only one location
alfredo

Replies: 10
Views: 1703

PostForum: Minerals and Mineralogy   Posted: Nov 26, 2022 20:22   Subject: Re: Minerals to be found in only one location
There are thousands of mineral species found at only one locality: henmilite, ferrivauxite, nikischerite, favreauite, petermegawite... to name only a few that I've happened to be looking at recently, ...
  Topic: How hard is it to find a new mineral species?
alfredo

Replies: 10
Views: 1500

PostForum: Minerals and Mineralogy   Posted: Nov 19, 2022 16:54   Subject: Re: How hard is it to find a new mineral species?
Around a hundred or so new mineral species are approved by the International Mineralogical Association every year. ("IMA approval" is only given after scientists have studied the material su ...
  Topic: Pebbles from Elba, containing... tourmaline?
alfredo

Replies: 4
Views: 796

PostForum: What is it? - Where is it from?   Posted: Nov 16, 2022 00:57   Subject: Re: Pebbles from Elba, containing... tourmaline?
Pete, does the white porcellanous matrix fluoresce dull red under SW UV light? (If so, it's probably feldspar and an aplitic or pegmatitic origin is more likely.)
  Topic: Mojave, California: What is It?
alfredo

Replies: 1
Views: 757

PostForum: FOR BEGINNERS: What is it? Where is it from?   Posted: Aug 19, 2022 23:20   Subject: Re: Mojave, California: What is It?
Perhaps not what you want to hear but, based on the color, luster, surface texture, interior bubbles, and sand incorporated into some surfaces - I think it's a beer bottle melted in a fire. I've found ...
  Topic: Unknown crystal
alfredo

Replies: 16
Views: 2791

PostForum: What is it? - Where is it from?   Posted: Aug 09, 2022 23:51   Subject: Re: Unknown crystal
I think John has got it! Check these photos here: https://www.mindat.org/gallery.php?loc=14241&min=549
Thanks. I am not familiar with this locality.
  Topic: Unknown crystal
alfredo

Replies: 16
Views: 2791

PostForum: What is it? - Where is it from?   Posted: Aug 09, 2022 21:46   Subject: Re: Unknown crystal
Looks like barite to me.
  Topic: Calcite is acting strange under UV
alfredo

Replies: 11
Views: 2714

PostForum: Minerals and Mineralogy   Posted: Aug 08, 2022 22:33   Subject: Re: Calcite is acting strange under UV
I agree with Joseph that the little tabular white crystals are stilbite.
 
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