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| Search found 204 matches |
| Author | Message |
|---|---|
 Topic: New technology for crystal models |
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| Josele Replies: 3 Views: 1135 |
 Forum: Off-Topic and Introductions Posted: Jul 07, 2020 17:55 Subject: Re: New technology for crystal models |
| In Spanish FMF there is a thread about these crystal models: Modelos cristalográficos
(If you are not comfortable with Spanish can use Google translator at top left of the page) |
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| Topic: Tourmaline |
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| Josele Replies: 16 Views: 2191 |
Forum: FOR BEGINNERS: What is it? Where is it from? Posted: Jul 05, 2020 19:44 Subject: Re: Tourmaline |
| And the two poles are different.
Not necessarily. Although tourmaline belongs to 3m class of the trigonal system and does not have a symmetry center nor symmetry plane perpendicular to the c-axis, it ... |
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| Topic: Tourmaline |
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| Josele Replies: 16 Views: 2191 |
Forum: FOR BEGINNERS: What is it? Where is it from? Posted: Jul 05, 2020 09:04 Subject: Re: Tourmaline |
| ... I don't have a goniometer, and if I had one, it would be difficult to use since the specimen is glued on an acrylic display base. ... The specimen seems to be glued with thermal silicone. If this ... | |
| Topic: Tourmaline |
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| Josele Replies: 16 Views: 2191 |
Forum: FOR BEGINNERS: What is it? Where is it from? Posted: Jul 02, 2020 16:14 Subject: Re: Tourmaline |
| Another vote for tourmaline from Malkhan pegmatite field. This dark purple color is typical from this location. | |
| Topic: Complex calcite |
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| Josele Replies: 7 Views: 1536 |
Forum: Minerals and Mineralogy Posted: Jun 25, 2020 05:09 Subject: Re: Complex calcite |
| Pete, thank you very much for your help. That's more than an elaborate response, it is a master class lesson! It's amazing your ability to draw conclusions from a few simple and imprecise data. A plea ... | |
| Topic: Complex calcite |
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| Josele Replies: 7 Views: 1536 |
Forum: Minerals and Mineralogy Posted: Jun 24, 2020 07:14 Subject: Re: Complex calcite |
| Thank you Bob, you are always ready to help.
At the moment I have not a program to deal with crystals. It's long time ago that I miss this kind of application. |
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| Topic: Complex calcite |
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| Josele Replies: 7 Views: 1536 |
Forum: Minerals and Mineralogy Posted: Jun 23, 2020 19:18 Subject: Complex calcite |
| A few weeks ago I received a calcite crystal on dolomite from La Florida mining area (Spain). The crystal shows faces of a polyhedron combination: flat rhombohedron, scalenohedron, prism, “normal” rho ... | |
| Topic: Habit restriction of garnets |
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| Josele Replies: 13 Views: 4042 |
Forum: Minerals and Mineralogy Posted: Jun 13, 2020 17:18 Subject: Re: Habit restriction of garnets |
| Thank you Pete and Steve. Asking is always easier than answering. But often for the asker (me in this case!) the problem is understanding the smart responses.
This garnet issue has always puzzled me ... |
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| Topic: Habit restriction of garnets |
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| Josele Replies: 13 Views: 4042 |
Forum: Minerals and Mineralogy Posted: Jun 13, 2020 09:25 Subject: Habit restriction of garnets |
| Although they belong to the isometric system holohedral class (hexaoctahedral) and although they occur in a variety of rocks with diverse pressure and temperature conditions of formation, garnets habi ... | |
| Topic: Rose Quartz, Morganite or other? |
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| Josele Replies: 9 Views: 1722 |
Forum: FOR BEGINNERS: What is it? Where is it from? Posted: May 20, 2020 16:22 Subject: Re: Rose Quartz, Morganite or other? |
| Hola Andreu, welcome to FMF.
Some pics seem show cleavage planes and others show conchoidal fracture... Without reconocible faces is hard to say what it could be. Do you know the locality of origin ... |
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| Topic: Natural Blue Topaz w/ Multiple Tiny Unknown Mineral Inclusions |
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| Josele Replies: 4 Views: 1115 |
Forum: What is it? - Where is it from? Posted: May 16, 2020 08:57 Subject: Re: Natural Blue Topaz w/ Multiple Tiny Unknown Mineral Inclusions |
| To my understanding, epidote, diopside and galena are not species that one expect to find in a pegmatite.
The green one, could not be elbaite? |
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| Topic: Ice, H2O in Alaska |
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| Josele Replies: 1 Views: 1339 |
Forum: Micros & Macros - Images of Minerals Posted: May 11, 2020 07:16 Subject: Re: Ice, H2O in Alaska |
| Under certain conditions of humidity and temperature, fog crystallizes forming aggregates on the previous snowed surface, like in these pics: | |
| Topic: Red fluorescence in Fluorite |
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| Josele Replies: 6 Views: 2004 |
Forum: Minerals and Mineralogy Posted: May 05, 2020 16:21 Subject: Re: Red fluorescence in Fluorite |
| Berbes sample with a moderated blue fluorescence concentrated at the edges and a slight red fluorescence in some interior layers: | |
| Topic: Mines active for mineral specimens only |
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| Josele Replies: 9 Views: 6613 |
Forum: Mines and Mineral Localities Posted: Apr 04, 2020 11:07 Subject: Re: Mines active for mineral specimens only |
| David, with very few exceptions you can add all the hundreds of single locations in Afghanistan and Pakistan listed in Mindat, most of them working on pegmatite minerals but also for metamorphic and a ... | |
| Topic: Variscite? Turquoise? |
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| Josele Replies: 15 Views: 6853 |
Forum: FOR BEGINNERS: What is it? Where is it from? Posted: Feb 04, 2020 14:19 Subject: Re: Tortoise Variscite? Spiderweb Turqoise? |
| ... I’m not sure if I understand fully - are you saying you think these are not all the same material? ...Hello, Joe, no, I meant the black one, your samples are rocks (mix of minerals), metamorphic r ... | |
| Topic: Variscite? Turquoise? |
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| Josele Replies: 15 Views: 6853 |
Forum: FOR BEGINNERS: What is it? Where is it from? Posted: Feb 04, 2020 13:45 Subject: Re: Tortoise Variscite? Spiderweb Turqoise? |
| Hello X (sorry I don't know your name), welcome to FMF.
When asking for identification should provide the maximum of additional data, as is stated in the introduction thread of this section: Asking ... |
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| Topic: Help to identify this rock, please |
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| Josele Replies: 4 Views: 4196 |
Forum: What is it? - Where is it from? Posted: Feb 02, 2020 16:13 Subject: Re: Help to identify this rock, please |
| Could be a mafic igneous rock, gabbro type for example.
As said, without proper analysis is not possible to classify a rock with precision. Bob gives a good clue with the geological map when it ... |
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| Topic: A giant Vanadinite |
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| Josele Replies: 4 Views: 9642 |
Forum: Micros & Macros - Images of Minerals Posted: Jan 20, 2020 18:38 Subject: Re: A giant Vanadinite |
| Wow!
Hexagons are more than one inch big! It must feel very heavy in hand! A world class piece, best I've ever seen. Thanks for sharing it. |
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| Topic: New to the site ! Beginner trying to identify. |
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| Josele Replies: 2 Views: 3710 |
Forum: FOR BEGINNERS: What is it? Where is it from? Posted: Jan 18, 2020 12:50 Subject: Re: New to the site ! Beginner trying to identify. |
| Hello Elana, welcome to FMF.
Identification requests should be accompanied with some additional data. Please read Asking: "What is this? / Where is it from?" and give us the maximum of info ... |
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| Topic: Charcas - Pink Mineral |
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| Josele Replies: 10 Views: 5020 |
Forum: What is it? - Where is it from? Posted: Jan 18, 2020 06:16 Subject: Re: Charcas - Pink Mineral |
| How misleading can be a mineral photo, last one could be confused with globular chalcedony from Mamuju, Indonesia! | |
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