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05 Jun-03:08:20 Re: any interesting minerals from ukraine? (David)
05 Jun-03:00:29 Re: any interesting minerals from ukraine? (David)
05 Jun-02:51:24 Re: any interesting minerals from ukraine? (David)
04 Jun-17:36:55 Re: stay at home - coronavirus / covid-19 (Fena Kuiperi)
04 Jun-15:53:19 Re: collection of sante celiberti - a mineralogical trip through italy (Sante Celiberti)
04 Jun-13:15:12 Stay at home - coronavirus / covid-19 - magic castle (Jordi Fabre)
04 Jun-10:23:50 Re: collection of annemieke en rob schnerr (Rob Schnerr)
04 Jun-09:05:12 Re: collection of firmo espinar (Firmo Espinar)
04 Jun-08:42:41 Re: collection of volkmar stingl (Volkmar Stingl)
04 Jun-07:04:54 Re: any interesting minerals from ukraine? (Riccardo Modanesi)
03 Jun-15:36:00 Re: collection of sante celiberti - a mineralogical trip through italy (Sante Celiberti)
03 Jun-13:10:03 Re: stay at home - coronavirus / covid-19 (Enrique Llorens)
02 Jun-18:27:15 Re: collection of sante celiberti - a mineralogical trip through italy (Sante Celiberti)
02 Jun-12:40:16 Stay at home - coronavirus / covid-19 - hibiscus (Jordi Fabre)
02 Jun-03:16:14 Re: any interesting minerals from ukraine? (David)
02 Jun-02:04:21 Re: any interesting minerals from ukraine? (Riccardo Modanesi)
02 Jun-01:50:10 Re: any interesting minerals from ukraine? (David)
01 Jun-22:24:16 Re: any interesting minerals from ukraine? (Peter Lemkin)
01 Jun-17:47:51 Re: any interesting minerals from ukraine? (Robert Seitz)
01 Jun-11:16:03 Re: collection of firmo espinar (Firmo Espinar)
01 Jun-06:27:15 Re: any interesting minerals from ukraine? (David)
01 Jun-06:03:02 Re: any interesting minerals from ukraine? (David)
01 Jun-04:01:30 Re: any interesting minerals from ukraine? (Peter Lemkin)
01 Jun-03:34:37 Re: any interesting minerals from ukraine? (Jordi Fabre)
01 Jun-03:14:49 Re: any interesting minerals from ukraine? (David)

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  Topic: Calcite Mexico
John Betts

Replies: 4
Views: 421

PostForum: What is it? - Where is it from?   Posted: May 13, 2020 19:43   Subject: Re: Calcite Mexico
Looks like calcite from Henyan, China to me.
See:
www [dot] johnbetts-fineminerals [dot] com/jhbnyc/mineralmuseum/picshow.php?id=11992
  Topic: Another "where is it from"
John Betts

Replies: 10
Views: 2975

PostForum: FOR BEGINNERS: What is it? Where is it from?   Posted: Apr 20, 2020 19:22   Subject: Re: Another "where is it from"
I think that this may be from one of the Viburnum Trend mines. The shape of the pyrite, and the size and color of the dolomite crystals, is very similar to some that I've seen from the mid to southe ...
  Topic: Another "where is it from"
John Betts

Replies: 10
Views: 2975

PostForum: FOR BEGINNERS: What is it? Where is it from?   Posted: Apr 20, 2020 17:43   Subject: Re: Another "where is it from"
Just a guess, but with the limestone matrix and very small chalcopyrites, Pleasant Ridge Quarry and a couple of nearby quarries near Rensselaer Indiana produced somewhat similar examples of pyrite and ...
  Topic: Rounded yellow-green crystals in calcite
John Betts

Replies: 8
Views: 5109

PostForum: What is it? - Where is it from?   Posted: Mar 27, 2020 19:41   Subject: Re: Rounded yellow-green crystals in calcite
I should have mentioned, there is no reaction to HCL which rules out most carbonates.
  Topic: Rounded yellow-green crystals in calcite
John Betts

Replies: 8
Views: 5109

PostForum: What is it? - Where is it from?   Posted: Mar 27, 2020 19:39   Subject: Re: Rounded yellow-green crystals in calcite
Seems to be Prehnite on Calcite from Merelani

Thanks Jordi. That was actually my first thought, except there is no sign of bladed structure.

They look like the "melted" appearance fou ...
  Topic: Rounded yellow-green crystals in calcite
John Betts

Replies: 8
Views: 5109

PostForum: What is it? - Where is it from?   Posted: Mar 27, 2020 15:43   Subject: Re: Rounded yellow-green crystals in calcite
Another photo.
  Topic: Rounded yellow-green crystals in calcite
John Betts

Replies: 8
Views: 5109

PostForum: What is it? - Where is it from?   Posted: Mar 27, 2020 15:42   Subject: Rounded yellow-green crystals in calcite
I acquired an unlabeled specimen from a collection assembled around 1985-1995 that contained this specimen of translucent gray calcite with rounded yellow to yellow-green "blebs" of an unide ...
  Topic: Hematite Confirmation and Location
John Betts

Replies: 8
Views: 3410

PostForum: What is it? - Where is it from?   Posted: Mar 22, 2020 15:12   Subject: Re: Hematite Confirmation and Location
I don't know the location, but this looks like spinel-law twinned galena crystals.

The red-brown streak is not galena.
  Topic: Hematite Confirmation and Location
John Betts

Replies: 8
Views: 3410

PostForum: What is it? - Where is it from?   Posted: Mar 22, 2020 14:57   Subject: Re: Hematite Confirmation and Location
Is it magnetic?
  Topic: Malachite twinning
John Betts

Replies: 5
Views: 9116

PostForum: Minerals and Mineralogy   Posted: Mar 05, 2020 09:58   Subject: Re: Malachite twinning
Any good mineralogical reference lists twinning as common on {100} and {201}. See Dana's Mineralogy or the Mineral Handbook. This forum makes it difficult to post links, but you can search for the lat ...
  Topic: La Morita Mine
John Betts

Replies: 1
Views: 8571

PostForum: Mines and Mineral Localities   Posted: Feb 21, 2020 13:50   Subject: La Morita Mine
Many dealers are now offering wulfenite specimens from:
"La Morita Mine, Sierra Mojina District, Chihuahua, Mexico"

Mindat lists a similarly named locality:
"La Morita Mine, Ascenc ...
  Topic: Unidentified green crystal
John Betts

Replies: 21
Views: 7722

PostForum: What is it? - Where is it from?   Posted: Feb 17, 2020 14:24   Subject: Re: Unidentified green crystal
Where was it collected?
Knowing the geologic setting (pegmatite? skarn? vein?) will help narrow the possibilities...
  Topic: What does this mean?
John Betts

Replies: 5
Views: 4122

PostForum: What is it? - Where is it from?   Posted: Jan 25, 2020 11:44   Subject: Re: What does this mean?
..The color that attracts you is undoubtedly due to the heat treatment with titanium...
In fact, I believe they are using vacuum vapor deposition to coat the quartz.
  Topic: An Overview of Minerals Toxicity - (32)
John Betts

Replies: 7
Views: 8741

PostForum: Featured Columns of FMF   Posted: Jan 02, 2020 17:38   Subject: Re: An Overview of Minerals Toxicity - (32)
What about absorption through the skin?
  Topic: Fake Colombian Emeralds
John Betts

Replies: 35
Views: 47066

PostForum: Incorrect classification and fakes   Posted: Dec 14, 2019 11:24   Subject: Re: Fake Colombian Emeralds
One word of caution about using UV illumination to test for adhesives:
The new generation of UV-cured adhesives do NOT fluoresce.

These are water-clear colorless adhesives that remain liquid unt ...
  Topic: Spherical formations from a 1990s collection
John Betts

Replies: 7
Views: 1962

PostForum: What is it? - Where is it from?   Posted: Dec 01, 2019 20:12   Subject: Re: Spherical formations from a 1990s collection
Your pic 2.jpg shows the exact thing I see in person, but was unable to photograph.
  Topic: Spherical formations from a 1990s collection
John Betts

Replies: 7
Views: 1962

PostForum: What is it? - Where is it from?   Posted: Dec 01, 2019 20:10   Subject: Re: Spherical formations from a 1990s collection
That's it Pete! Thanks.
  Topic: Spherical formations from a 1990s collection
John Betts

Replies: 7
Views: 1962

PostForum: What is it? - Where is it from?   Posted: Dec 01, 2019 16:47   Subject: Re: Spherical formations from a 1990s collection
Here is a larger photo of one.
  Topic: Spherical formations from a 1990s collection
John Betts

Replies: 7
Views: 1962

PostForum: What is it? - Where is it from?   Posted: Dec 01, 2019 16:44   Subject: Re: Spherical formations from a 1990s collection
S.G. will not help as it is a mixture.

No fluorescence.
Not magnetic.
The pink mineral does not react to HCL.
  Topic: Spherical formations from a 1990s collection
John Betts

Replies: 7
Views: 1962

PostForum: What is it? - Where is it from?   Posted: Dec 01, 2019 15:18   Subject: Re: Spherical formations from a 1990s collection
The collection had many specimens from Colorado and Utah, but that should not limit your suggestions.

Any suggestions for where these originated and the minerals?
 
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