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21 Oct-04:40:54 Re: munich show (mineralientage) 2019 (Tobi)
21 Oct-04:38:10 Re: don lum collection (Tobi)
21 Oct-04:36:57 Re: new kyanite discovery bc canada (Tobi)
21 Oct-04:35:02 Re: new sapphire corundum deposit found in bc canada (Tobi)
20 Oct-19:33:44 Re: don lum collection (Don Lum)
20 Oct-14:25:56 Re: new generation for picture - ploum (Ploum)
20 Oct-13:25:47 Re: pyrrhotite herja? (Nicu)
20 Oct-12:15:49 Re: pyrrhotite herja? (Bob Morgan)
20 Oct-11:03:11 Munich show (mineralientage) 2019 (Jordi Fabre)
20 Oct-08:59:06 Re: collection of tobi (Tobi)
20 Oct-08:36:44 Re: pyrrhotite herja? (Roger Warin)
20 Oct-07:01:52 Re: collection of tobi (Tobi)
20 Oct-06:48:05 Re: pyrrhotite herja? (Raystraw)
20 Oct-06:42:59 Re: pyrrhotite herja? (Jordi Fabre)
20 Oct-06:14:53 Pyrrhotite herja? (Mathias)
20 Oct-02:06:50 Re: new kyanite discovery bc canada (Philippe Durand)
19 Oct-23:37:58 The mizunaka collection - quartz (Am Mizunaka)
19 Oct-16:26:01 Re: collection of firmo espinar (Firmo Espinar)
19 Oct-15:48:56 New kyanite discovery bc canada (Thecrystalfinderbc)
19 Oct-15:40:43 Re: pegmatite exploration bc canada (Thecrystalfinderbc)
19 Oct-15:31:22 Pegmatite exploration bc canada (Thecrystalfinderbc)
19 Oct-15:02:16 Re: new sapphire corundum deposit found in bc canada (Thecrystalfinderbc)
19 Oct-14:59:12 New sapphire corundum deposit found in bc canada (Thecrystalfinderbc)
19 Oct-14:05:30 Re: new generation for picture - ploum (Jose Luis Jara Jara)
19 Oct-13:27:29 Re: new generation for picture - ploum (Ploum)

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  Topic: Help identification
John Betts

Replies: 7
Views: 563

PostForum: What is it? - Where is it from?   Posted: Sep 27, 2019 13:02   Subject: Re: Help identification
DSC_0015.JPG and DSC_0016.JPG = covellite with pyrite
  Topic: Does anyone know what the proper name for "Jack Rock" is?
John Betts

Replies: 4
Views: 524

PostForum: FOR BEGINNERS: What is it? Where is it from?   Posted: Aug 11, 2019 18:45   Subject: Re: Does anyone know what the proper name for "Jack Rock" is?
I suggest contacting the nearest college/university with a geology department, or the state geological survey. Also try searching Google for "Mineral Club Directory" to find the local minera ...
  Topic: Fake Ruby?
John Betts

Replies: 13
Views: 1593

PostForum: What is it? - Where is it from?   Posted: Jun 19, 2019 20:48   Subject: Re: Fake Ruby?
Using LW or SW UV to detect glues no longer is applicable. Many modern adhesives are UV-curing and they work by absorbing the UV illumination.

I use UV-curing adhesive to restore Herkimer Diamond ...
  Topic: Stability of Azurite vs Malachite
John Betts

Replies: 23
Views: 2723

PostForum: Minerals and Mineralogy   Posted: Jun 10, 2019 07:58   Subject: Re: Stability of Azurite vs Malachite
The interpretation of the thin-skinned azurite over malachite is interpreted as "azurite over malachite ps. after azurite."

I believe these are actually "malachite ps. after azurite& ...
  Topic: Stability of Azurite vs Malachite
John Betts

Replies: 23
Views: 2723

PostForum: Minerals and Mineralogy   Posted: Jun 06, 2019 17:37   Subject: Re: Stability of Azurite vs Malachite
Ray, the key to pseudomorphism, as you wrote, is that the primary mineral is a larger volume than the secondary mineral. Malachite is less volume than same weight of azurite, resulting in porous pseud ...
  Topic: Are there any Sicilian Sulphur fakes still around?
John Betts

Replies: 12
Views: 1525

PostForum: Incorrect classification and fakes   Posted: May 20, 2019 13:19   Subject: Re: Are there any Sicilian Sulphur fakes still around?
Sulfur fakes

The crystals sit on the authentic rock matrix. Differentiating the "fakes" from real levels is very difficult or almost impossible


In the early years he used incorrect ...
  Topic: Calcite Cone?
John Betts

Replies: 15
Views: 1172

PostForum: What is it? - Where is it from?   Posted: May 16, 2019 15:18   Subject: Re: Calcite Cone?
Ed Raines at the Colorado School of Mines has seen similar from Fort Collins area and from east of Colorado Springs.

Case Closed.

Thanks everyone for your help.
  Topic: Calcite Cone?
John Betts

Replies: 15
Views: 1172

PostForum: What is it? - Where is it from?   Posted: May 16, 2019 12:44   Subject: Re: Calcite Cone?
Hi, for me this is a classic cone-in-cone concretion. No calcite inside, but sediment of shale type.

It is definitely composed of calcite.
One friend commented that he has seen these specimens be ...
  Topic: Calcite Cone?
John Betts

Replies: 15
Views: 1172

PostForum: What is it? - Where is it from?   Posted: May 16, 2019 12:25   Subject: Re: Calcite Cone?
This does not look like the "classic" "cone-in cone" structures associated with impact structures, i.e., Crooked Creek, Missouri, but more resembles the similar forms I've seen sur ...
  Topic: Calcite Cone?
John Betts

Replies: 15
Views: 1172

PostForum: What is it? - Where is it from?   Posted: May 16, 2019 12:01   Subject: Re: Calcite Cone?
Yes, I am aware of cone-in-cone structures, and I already exhaustively searched the Internet. No luck.

I was hoping someone here would have personal knowledge of a calcite formation perfect conical ...
  Topic: Calcite Cone?
John Betts

Replies: 15
Views: 1172

PostForum: What is it? - Where is it from?   Posted: May 16, 2019 11:03   Subject: Calcite Cone?
Does anybody recognize what this is and where it is from?

It is from the collection of Colorado collector Ruth Schwarz and was labeled as a "natural calcite cone" that was loaned for a c ...
  Topic: Grossular Peru?
John Betts

Replies: 9
Views: 1282

PostForum: What is it? - Where is it from?   Posted: May 05, 2019 10:31   Subject: Re: Grossular Peru
It looks like fluorite.
  Topic: Galena, Kommern
John Betts

Replies: 42
Views: 4328

PostForum: What is it? - Where is it from?   Posted: Apr 20, 2019 15:03   Subject: Re: Galena, Kommern
This reference describes the habit of galena found:

"As small concretionary nodules, it occurs disseminated through sand-stone at Kommern in the Eifel."

See: https:(/)(/)en(.)wikisourc ...
  Topic: Galena, Kommern
John Betts

Replies: 42
Views: 4328

PostForum: What is it? - Where is it from?   Posted: Apr 20, 2019 14:52   Subject: Re: Galena, Kommern
To see references for galena from Kommern search for "Bleiglanz von kommern" or "Galenit von kommern."

Many results are available.
  Topic: Galena, Kommern
John Betts

Replies: 42
Views: 4328

PostForum: What is it? - Where is it from?   Posted: Apr 20, 2019 14:38   Subject: Re: Galena, Kommern
[quote="Kevin Conroy"]For what it's worth, there's a similar looking specimen on Mindat: https://www.mindat.org/photo-69466.html

I think the NY State collection was well curated and well ...
  Topic: Galena, Kommern
John Betts

Replies: 42
Views: 4328

PostForum: What is it? - Where is it from?   Posted: Apr 20, 2019 14:23   Subject: Re: Galena, Kommern
Galena from
Gottessegen open pit, Griesberg, Kommern, Mechernich, Eifel, North Rhine-Westphalia, Germany

References: Graf, HW., (1992): Fundstellen und Mineralien in de Nordeifel (Teil 1+2), Mine ...
  Topic: Galena, Kommern
John Betts

Replies: 42
Views: 4328

PostForum: What is it? - Where is it from?   Posted: Apr 20, 2019 13:07   Subject: Re: Galena, Kommern
Is the specimen heavy?
  Topic: Galena, Kommern
John Betts

Replies: 42
Views: 4328

PostForum: What is it? - Where is it from?   Posted: Apr 20, 2019 13:00   Subject: Re: Galena, Kommern
"Kommen von" means "comes from" in German
  Topic: Galena, Kommern
John Betts

Replies: 42
Views: 4328

PostForum: What is it? - Where is it from?   Posted: Apr 20, 2019 12:54   Subject: Re: Galena, Kommern
Galena is well known in this habit (Bulgaria).

Let's not condemn these as synthetic bismuth without a simple hardness test.
Galena streak = Lead-grey
Bismuth streak = Silver-white
  Topic: Wulfenite USA
John Betts

Replies: 4
Views: 896

PostForum: What is it? - Where is it from?   Posted: Apr 09, 2019 12:48   Subject: Re: Wulfenite USA
It is Positively wulfenite on barite from the Rowley Mine, Az.
 
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