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11 Feb-04:03:47 Re: crystal habit identification (James Catmur)
10 Feb-17:25:08 Re: crystal habit identification (Jaime_cerdeira)
10 Feb-16:55:09 Re: collection of michael shaw (Michael Shaw)
10 Feb-15:39:10 Re: crystal habit identification (Roger Warin)
10 Feb-08:38:39 Re: the mim museum in beirut, lebanon (Mim Museum)
10 Feb-06:25:34 Re: crystal habit identification (Jaime_cerdeira)
10 Feb-06:12:49 Re: crystal habit identification (Jaime_cerdeira)
10 Feb-04:03:46 Re: crystal habit identification (Roger Warin)
09 Feb-21:37:19 Crystal habit identification (Jaime_cerdeira)
09 Feb-18:40:20 Re: mineral identification question (Godscreation1988)
09 Feb-15:16:35 Re: mineral identification question (Kevin Schofield)
09 Feb-14:38:10 Re: mineral identification question (Godscreation1988)
09 Feb-12:09:21 Re: mineral identification question (Herwig)
09 Feb-11:27:18 Re: mineral identification question (Godscreation1988)
09 Feb-10:51:50 Re: mineral identification question (Bob Carnein)
09 Feb-10:48:11 Re: mineral identification question (Godscreation1988)
09 Feb-09:52:28 Re: mineral identification question (Godscreation1988)
09 Feb-09:37:46 Re: mineral identification question (Godscreation1988)
09 Feb-09:36:08 Re: mineral identification question (Godscreation1988)
09 Feb-09:34:57 Re: mineral identification question (Godscreation1988)
09 Feb-09:14:38 Re: mineral identification question (Godscreation1988)
09 Feb-07:51:20 Re: mineral identification question (James Catmur)
09 Feb-07:26:34 Re: mineral identification question (Herwig)
09 Feb-06:56:42 Re: mineral identification question (Tobi)
09 Feb-06:21:58 Re: mineral identification question (Godscreation1988)

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  Topic: mim Museum supports FMF!
Linus

Replies: 16
Views: 2826

PostForum: Comments & Suggestions   Posted: Jan 02, 2025 13:17   Subject: Re: mim Museum supports FMF!
Congratulations to FMF and all of you who have worked hard to keep it going. If this news means that fmf will be with us for a good long time going forward, it is great news indeed!
  Topic: Sagenite agate from Bulgaria
Linus

Replies: 9
Views: 3200

PostForum: Micros & Macros - Images of Minerals   Posted: Aug 06, 2024 14:53   Subject: Re: Sagenite agate from Bulgaria
I have seen this style of agate from several locations, notably brazil and mexico. the "rutile" like features are actually strings of micro-bubbles.
  Topic: Is Malachite Rare?
Linus

Replies: 3
Views: 2375

PostForum: Minerals and Mineralogy   Posted: Jun 20, 2024 16:24   Subject: Re: Is Malachite Rare?
Bisbee supplied some of the most gorgeous velvety malachite on the planet, long since exhausted, alas...
  Topic: Nifontovite
Linus

Replies: 8
Views: 7817

PostForum: Minerals and Mineralogy   Posted: Dec 09, 2023 15:52   Subject: Re: Nifontovite
Tired of looking at those skinny clear nifontovites? For the size freaks out there, here's one of the plumpest single nifontovites Ive seen (single crystal near center right edge on the photo), 0.5&qu ...
  Topic: Dissolution enables dolomite crystal growth near ambient conditions
Linus

Replies: 9
Views: 9052

PostForum: Mineralogical Literature   Posted: Nov 24, 2023 15:48   Subject: Re: Dissolution enables dolomite crystal growth near ambient conditions
I like to hear of your three methods of dolomite formation. I'm particularly a fan and supporter of the third method you describe, which I have seen in the field in several important mineral districts ...
  Topic: Calcite geode from Idar
Linus

Replies: 2
Views: 4484

PostForum: Minerals and Mineralogy   Posted: Apr 21, 2023 18:27   Subject: Re: Calcite geode from Idar
I think its cool! Wonder whether parts of it fluoresce?
  Topic: Amethyst
Linus

Replies: 17
Views: 12853

PostForum: FOR BEGINNERS: What is it? Where is it from?   Posted: Feb 25, 2023 14:08   Subject: Re: Amethyst
Amir, I visited your quartz website, very nicely done! It really helps to clarify this situation.
  Topic: Amethyst
Linus

Replies: 17
Views: 12853

PostForum: FOR BEGINNERS: What is it? Where is it from?   Posted: Feb 25, 2023 13:20   Subject: Re: Amethyst
I see Fluorite cubes. Could you test the hardness?

I agree it looks like fluorite, I see a lot of 90 degree angles and almost no conchoidal fractures. A hardness test would be very useful - does g ...
  Topic: Semi-spherical exterior, radiating interior stone
Linus

Replies: 31
Views: 20429

PostForum: FOR BEGINNERS: What is it? Where is it from?   Posted: Feb 11, 2023 12:26   Subject: Re: Semi-spherical exterior, radiating interior stone
Hi, I do think your image of mcrowrock3 shows a centralized protrusion - thus shell is a better explanation for the spherical bottom. shell or coral, either way, I still am leaning towards fossil. The ...
  Topic: Semi-spherical exterior, radiating interior stone
Linus

Replies: 31
Views: 20429

PostForum: FOR BEGINNERS: What is it? Where is it from?   Posted: Feb 10, 2023 20:16   Subject: Re: Semi-spherical exterior, radiating interior stone
Cretaceous age fossil corals are known from the San Antonio area of south Texas, and from north of Nuevo Laaredo, both approximately 200 kms from Zapata.I have enclosed a cross section drawing of a Cr ...
  Topic: Semi-spherical exterior, radiating interior stone
Linus

Replies: 31
Views: 20429

PostForum: FOR BEGINNERS: What is it? Where is it from?   Posted: Feb 10, 2023 17:54   Subject: Re: Semi-spherical exterior, radiating interior stone
I guess the real question is, "was this transported? or found in outcrop"? judging from all the eocene sediments surrounding zapata, tx and the pronounced rounding and abrasion of the item I ...
  Topic: Semi-spherical exterior, radiating interior stone
Linus

Replies: 31
Views: 20429

PostForum: FOR BEGINNERS: What is it? Where is it from?   Posted: Feb 10, 2023 17:15   Subject: Re: Semi-spherical exterior, radiating interior stone
oh come now, fossils can easily be preserved by silica (corals in the Horquilla Formation in Southern Arizona, petrified wood; and brachiopods on the Colorado Plateau; I have seen them preserved as we ...
  Topic: Semi-spherical exterior, radiating interior stone
Linus

Replies: 31
Views: 20429

PostForum: FOR BEGINNERS: What is it? Where is it from?   Posted: Feb 10, 2023 14:25   Subject: Re: Semi-spherical exterior, radiating interior stone
I agree - fossil. Most all concretions form concentric rings, the radial pattern is not at all typical of a concretion.
  Topic: Brazil Amethyst
Linus

Replies: 1
Views: 13369

PostForum: Mineralogical Literature   Posted: May 31, 2022 18:41   Subject: Brazil Amethyst
Hi all! A couple months ago I ran across a brilliant old article by Rock Currier detailing one of his early trips to Rio Grande do Sul with lots of great photos. I can't find it now! Does anyone have ...
  Topic: Location in Romania
Linus

Replies: 5
Views: 5644

PostForum: What is it? - Where is it from?   Posted: Sep 30, 2021 17:31   Subject: Re: Location in Romania
just ran across this:
Boița is a commune in Sibiu County, Transylvania, Romania, at the foothills of the Cindrel Mountains, 22 km south of the county capital Sibiu
 
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