| A general guide for using the Forum with some rules and tips |
| Search found 196 matches |
| Author | Message |
|---|---|
 Topic: Variscite? Turquoise? |
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| Josele Replies: 15 Views: 695 |
 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: 695 |
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: 267 |
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: 922 |
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: 380 |
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: 829 |
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! | |
| Topic: Some carvings |
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| Josele Replies: 11 Views: 705 |
Forum: Off-Topic and Introductions Posted: Jan 14, 2020 12:38 Subject: Re: Some carvings |
| Agree with Tobi, is not rose quartz, looks like quartzite or maybe massive quartz stained by oxides.
Also in accord that most FMF members we prefer natural crystals. But I think this kind of handcra ... |
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| Topic: Rock Identification |
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| Josele Replies: 8 Views: 489 |
Forum: FOR BEGINNERS: What is it? Where is it from? Posted: Jan 12, 2020 12:33 Subject: Re: Rock Identification |
| Hello Mark, maybe you have no responses because often is not possible identifying rocks just seeing photos.
I don't know what these beautiful rocks are but to me they don't look like basalt. You can ... |
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| Topic: I really need some help with identifying |
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| Josele Replies: 3 Views: 281 |
Forum: FOR BEGINNERS: What is it? Where is it from? Posted: Jan 11, 2020 15:15 Subject: Re: I really need some help with identifying |
| In index page (home page) look for "FOR BEGINNERS: What is it? Where is it from?" or "What is it? - Where is it from?". Click the appropriate option and a new page will be open. Up ... | |
| Topic: The concept of matrix |
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| Josele Replies: 8 Views: 997 |
Forum: Minerals and Mineralogy Posted: Jan 07, 2020 19:14 Subject: Re: The concept of matrix |
| Let me clarify that I used the concept "mother rock" as literal translation of roca madre which is Spanish is synonym of "host rock" (roca encajante) and also synonym of "matr ... | |
| Topic: The concept of matrix |
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| Josele Replies: 8 Views: 997 |
Forum: Minerals and Mineralogy Posted: Jan 07, 2020 05:14 Subject: The concept of matrix |
| Often the word matrix is used in mineral forums as the substrate of the main specie or most prominent crystals of a specimen, even when this substrate is another mineral specie and not the rock where ... | |
| Topic: What type of metamorphic rock is this? |
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| Josele Replies: 16 Views: 1027 |
Forum: FOR BEGINNERS: What is it? Where is it from? Posted: Dec 12, 2019 08:14 Subject: Re: What type of metamorphic rock is this? |
| Is strange that in a museum there is not a label identifying the sample.
It looks like gneiss with a quite high proportion of mafic minerals, which would be a HIGH grade metamorphic rock. |
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| Topic: What is this? |
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| Josele Replies: 3 Views: 599 |
Forum: What is it? - Where is it from? Posted: Dec 11, 2019 18:25 Subject: Re: What is this? |
| Some additional data will help identification. Please see: Asking: "What is this? / Where is it from?"
Maybe there is more than one species here. Closeup photos will help too. |
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| Topic: Unstable pyrite |
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| Josele Replies: 15 Views: 1512 |
Forum: Conserving, Preparing and Cleaning Minerals Posted: Nov 12, 2019 17:55 Subject: Re: Unstable pyrite |
| My experience is that, when kept under the same conditions, pyrite from some localities tends to decompose after a time, while pyrite from other localities stays stable. In my very first rock drawers ... | |
| Topic: What rock is this? |
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| Josele Replies: 9 Views: 1421 |
Forum: FOR BEGINNERS: What is it? Where is it from? Posted: Sep 20, 2019 04:08 Subject: Re: What rock is this? |
| My humble opinion is based on the fact that I don't know of volcanic deposits near Como. But maybe they exist... | |
| Topic: What rock is this? |
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| Josele Replies: 9 Views: 1421 |
Forum: FOR BEGINNERS: What is it? Where is it from? Posted: Sep 19, 2019 10:15 Subject: Re: What rock is this? |
| To me, it looks like slag glass. | |
| Topic: First Post, Black Specimen |
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| Josele Replies: 8 Views: 1249 |
Forum: FOR BEGINNERS: What is it? Where is it from? Posted: Sep 04, 2019 17:23 Subject: Re: First Post, Black Specimen |
| The black one seems a kind of chert / flint that can be used as touchstone to check precious metals. | |
| Topic: Purchased online, what is this blueish green stone? |
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| Josele Replies: 8 Views: 1806 |
Forum: What is it? - Where is it from? Posted: Jul 16, 2019 12:52 Subject: Re: Purchased online, what is this blueish green stone? |
| My crystal ball says:
If it is from Bahía (Brasil) it could be fluorapatite. If it is from Madagascar then it could be grandidierite. |
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| Topic: Please help identify : BLACK glass like stone with tiny pink „crystals”??? |
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| Josele Replies: 6 Views: 1387 |
Forum: FOR BEGINNERS: What is it? Where is it from? Posted: May 26, 2019 16:48 Subject: Re: Please help identify : BLACK glass like stone with tiny pink „crystals”??? |
| Hello Olivia, welcome to FMF.
Enlarged photos show what seem to be small bubbles. If so, I think it could be a slag glass. A nice find anyway. |
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| Topic: Favourite Barytes? |
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| Josele Replies: 20 Views: 7378 |
Forum: Favourite Minerals Posted: May 13, 2019 08:05 Subject: Re: Favourite Barytes? |
| Here comes a honey colored Chinese baryte with weird deformed faces and unusual fluorescence: | |
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