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24 Jun-05:53:51 Re: what rock matt black color high density medium hard ? (Matt_zukowski)
24 Jun-04:49:27 Re: what rock matt black color high density medium hard ? (Steveb)
24 Jun-00:17:02 Re: what rock matt black color high density medium hard ? (User4242333)
24 Jun-00:02:38 Re: what rock matt black color high density medium hard ? (Peter Lemkin)
23 Jun-23:56:42 Re: what rock matt black color high density medium hard ? (User4242333)
23 Jun-23:43:12 Re: what rock matt black color high density medium hard ? (User4242333)
23 Jun-23:34:25 Re: what rock matt black color high density medium hard ? (User4242333)
23 Jun-15:41:10 Re: collection of firmo espinar (Firmo Espinar)
23 Jun-15:13:48 Re: favourite barytes? (Bob Harman)
23 Jun-14:38:11 Re: a mineralogical trip through italy by sante celiberti (Sante Celiberti)
23 Jun-13:44:53 Re: favourite barytes? (Bob Harman)
23 Jun-12:47:58 Re: what rock matt black color high density medium hard ? (Peter Lemkin)
23 Jun-10:27:01 Re: what rock matt black color high density medium hard ? (Steveb)
23 Jun-10:18:38 Re: what kind of mineral is it ? (Carpathian Gems)
23 Jun-10:10:11 Re: what kind of mineral is it ? (Alfredo)
23 Jun-09:08:54 Re: what kind of mineral is it ? (Carpathian Gems)
23 Jun-08:54:49 Re: what kind of mineral is it ? (Bob Harman)
23 Jun-08:25:56 Re: what rock matt black color high density medium hard ? (Bob Carnein)
23 Jun-08:14:24 What kind of mineral is it ? (Carpathian Gems)
23 Jun-08:11:46 Re: the mizunaka collection (Bob Morgan)
23 Jun-07:56:10 Re: favourite quartzes? (Bob Morgan)
23 Jun-07:29:21 Re: what rock matt black color high density medium hard ? (User4242333)
23 Jun-07:28:26 What rock matt black color high density medium hard ? (User4242333)
23 Jun-02:55:37 Re: the mizunaka collection - quartz (Am Mizunaka)
22 Jun-23:18:14 Re: favourite quartzes? (Eck Noch)

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  Topic: Strange green & brown geode
Bergur_E_Sigurdarson

Replies: 8
Views: 684

PostForum: FOR BEGINNERS: What is it? Where is it from?   Posted: Jun 07, 2021 00:33   Subject: Re: Strange green & brown geode
Bob.... your response to Volkmar sounds very aggressive... whether that was intended or not.

I tend to agree with Volkmar, that using scientific metods to establish what a mineral is and teaching h ...
  Topic: Price changes
Bergur_E_Sigurdarson

Replies: 16
Views: 2022

PostForum: Off-Topic and Introductions   Posted: Apr 25, 2021 13:14   Subject: Re: Price changes
Funny how we got into maths....
even if assumed cost of obtaining a specimen is $1 ... 3000% would be $30
:-P

I often see (mostly those older than me, being 44) long time collectors complain abo ...
  Topic: Melanophlogite?
Bergur_E_Sigurdarson

Replies: 10
Views: 1720

PostForum: What is it? - Where is it from?   Posted: Apr 06, 2021 17:42   Subject: Re: Melanophlogite?
Sounds like you need a lab to test your samples.
  Topic: Melanophlogite?
Bergur_E_Sigurdarson

Replies: 10
Views: 1720

PostForum: What is it? - Where is it from?   Posted: Apr 06, 2021 14:56   Subject: Re: Melanophlogite?
Try mindat?

https://www.mindat.org/min-2630.html
  Topic: Sometimes fluorescent
Bergur_E_Sigurdarson

Replies: 5
Views: 1356

PostForum: Off-Topic and Introductions   Posted: Feb 27, 2021 08:34   Subject: Re: Sometimes fluorescent
Sometimes the fluorescence is not caused by the basic elements of the mineral.
Decent example is Beryl var. Emerald.
In that case iron, vanadium and chromium are the microelements that cause the col ...
  Topic: Final balance time.
Bergur_E_Sigurdarson

Replies: 18
Views: 4785

PostForum: Comments & Suggestions   Posted: Jan 13, 2021 09:41   Subject: Re: Final balance time.
That's a beauty Bergur, congratulations. Is that a Japan Law twin I see at around 10 o'clock in the bottom photo?

No, but it has a different habit to the rest, being tabular
  Topic: Final balance time.
Bergur_E_Sigurdarson

Replies: 18
Views: 4785

PostForum: Comments & Suggestions   Posted: Jan 12, 2021 16:21   Subject: Re: Final balance time.
MFFN1-jXDD0

I have been "stuck" in Colombia since the end of 2019, so no shows for me.

I did manage a couple of visits to mines before quarantine.

I did though manage to find myself ...
  Topic: This crazy mineral market!
Bergur_E_Sigurdarson

Replies: 14
Views: 3777

PostForum: Comments & Suggestions   Posted: Jan 04, 2021 18:41   Subject: Re: This crazy mineral market!
I like to browse the "bargain bin" material at most shows I've managed to attend.
Often not to find exceptional pieces, but minors that remind me of things I like and would some day like to ...
  Topic: Collection of Bergur E. Sigurdarson
Bergur_E_Sigurdarson

Replies: 49
Views: 31854

PostForum: Collection photos and Collector's page   Posted: Dec 08, 2020 15:39   Subject: Collection of Bergur E. Sigurdarson
Thank you Tobi
...and for the input on the Peruvian piece
...at the moment Jordi is right.
I have been searching the internet (mindat and more) and just recently found several near identical pieces ...
  Topic: Collection of Bergur E. Sigurdarson
Bergur_E_Sigurdarson

Replies: 49
Views: 31854

PostForum: Collection photos and Collector's page   Posted: Dec 08, 2020 11:37   Subject: Re: Collection of Bergur E. Sigurdarson
Some green xmas colour.
A chain of emeralds in calcite and shale.
Some are even double terminated.

Bought in Bogota, so the location isn't 100%
... seller said Coscuez area, and that looks right ...
  Topic: Collection of Bergur E. Sigurdarson
Bergur_E_Sigurdarson

Replies: 49
Views: 31854

PostForum: Collection photos and Collector's page   Posted: Dec 06, 2020 11:18   Subject: Collection of Bergur E. Sigurdarson
I got this and a few more specimens at Peñas Blancas in the beginning of the year.
This one has a faden like line running through the quartz and in the same direction a line runs through the fluorite ...
  Topic: Please help! Is this "Ocean Jasper" Real or Dyed/Fake/Enhanced?
Bergur_E_Sigurdarson

Replies: 14
Views: 6930

PostForum: Incorrect classification and fakes   Posted: Sep 12, 2020 14:39   Subject: Re: Please help! Is this "Ocean Jasper" Real or Dyed/Fake/Enhanced?
You do know you can have multiple photos in a single post, right?

Judging by your initial description, which failed to show us the photos of the vendor (no link is needed, just save from his site, ...
  Topic: History of the Chivor Emerald Mine, Colombia (Part 1)
Bergur_E_Sigurdarson

Replies: 4
Views: 3664

PostForum: The histories behind mineral specimens   Posted: Jul 24, 2020 14:12   Subject: Re: History of the Chivor Emerald Mine, Colombia (Part 1)
Awesome!

Haven't taken the time to read it all, but as I quickly glanced through I was wondering about El Toro.... which isn't marked on fig.3
....is that Gachala and not Chivor area?
  Topic: Collection of Bergur E. Sigurdarson
Bergur_E_Sigurdarson

Replies: 49
Views: 31854

PostForum: Collection photos and Collector's page   Posted: Jul 10, 2020 14:54   Subject: Collection of Bergur E. Sigurdarson
The biggest microcline feldspar I've ever found myself, and I believe it's a manebach-twin, tho parts of it are missing.
I wasn't fortunate enough to find the pocket came from (I was just going throu ...
  Topic: Collection of Bergur E. Sigurdarson
Bergur_E_Sigurdarson

Replies: 49
Views: 31854

PostForum: Collection photos and Collector's page   Posted: Jul 09, 2020 11:29   Subject: Collection of Bergur E. Sigurdarson
Before the lockdown I had to leave Colombia for a few days and went for a quick weekend hop to Lima, Peru. I used the opportunity to get some specimens from there.

Didn't have much time to prepare, ...
  Topic: Collection of Bergur E. Sigurdarson
Bergur_E_Sigurdarson

Replies: 49
Views: 31854

PostForum: Collection photos and Collector's page   Posted: Jul 04, 2020 16:53   Subject: Collection of Bergur E. Sigurdarson
Small but perfect little Emerald sitting on "wings" of Calcite... I called it the butterfly... but maybe it's so small, that just fly would be more appropriate :-)
  Topic: Collection of Bergur E. Sigurdarson
Bergur_E_Sigurdarson

Replies: 49
Views: 31854

PostForum: Collection photos and Collector's page   Posted: Jul 02, 2020 15:10   Subject: Collection of Bergur E. Sigurdarson
Quite large crystal of Euclase, with several smaller ones in matrix.

Although the piece seems to have suffered a bit in the ground or extraction, the main crystal has only that missing piece on top ...
  Topic: Collection of Bergur E. Sigurdarson
Bergur_E_Sigurdarson

Replies: 49
Views: 31854

PostForum: Collection photos and Collector's page   Posted: Jun 25, 2020 15:16   Subject: Collection of Bergur E. Sigurdarson
A cute quartz cluster from Santander, Colombia.
I'm not 100% on whether it's from La Belleza or up the valley La Playa (I'm guessing they're the same "municipio").
My sources tell me there ...
  Topic: Collection of Bergur E. Sigurdarson
Bergur_E_Sigurdarson

Replies: 49
Views: 31854

PostForum: Collection photos and Collector's page   Posted: Jun 22, 2020 12:54   Subject: Re: Collection of Bergur E. Sigurdarson
Nope, the actual matrix parts are quite solid.
Attached a half-decent phone-cam picture to show the back.

Crumbly rock?
  Topic: Collection of Bergur E. Sigurdarson
Bergur_E_Sigurdarson

Replies: 49
Views: 31854

PostForum: Collection photos and Collector's page   Posted: Jun 22, 2020 12:26   Subject: Re: Collection of Bergur E. Sigurdarson
Yes, the Dolomites sit on a light grey matrix :-)

Not a common specimen in that area.
Any patches of host rock on the opposite side?
Gérard
 
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