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| Search found 201 matches |
| Author | Message |
|---|---|
 Topic: What rock is this? |
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| Josele Replies: 9 Views: 626 |
 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: 626 |
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: 601 |
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: 1183 |
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: 914 |
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: 5465 |
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: | |
| Topic: Help identifying beautiful mineral |
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| Josele Replies: 3 Views: 1005 |
Forum: FOR BEGINNERS: What is it? Where is it from? Posted: Mar 31, 2019 16:42 Subject: Re: Help identifying beautiful mineral |
| ... could it be silicon carbide with such low density?For what can see at photos, seem to be plenty of bubbles inside which could explain the low density in addition to confirm that it is a slag. | |
| Topic: Help identifying beautiful mineral |
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| Josele Replies: 3 Views: 1005 |
Forum: FOR BEGINNERS: What is it? Where is it from? Posted: Mar 31, 2019 08:30 Subject: Re: Help identifying beautiful mineral |
| If it really is so hard could be silicon carbide. | |
| Topic: Faden article |
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| Josele Replies: 3 Views: 995 |
Forum: Mineralogical Literature Posted: Feb 20, 2019 07:21 Subject: Re: Faden article |
| In MINERAL UP magazine, Vol VI, nº 4, December 2016 (published in Spain in English language), there is an extensive article about faden quartz authored by Jesus Fraile and Miguel Calvo with photos by ... | |
| Topic: What stone is around this fireplace? |
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| Josele Replies: 1 Views: 688 |
Forum: What is it? - Where is it from? Posted: Feb 03, 2019 14:02 Subject: Re: What stone is around this fireplace? |
| The darkest one looks like a brecciated black marble and the brown one could be also a carbonate rock, maybe with any degree of metamorphism too.
Is more reliable to do the acid test with a drop of d ... |
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| Topic: Black mineral ID help needed |
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| Josele Replies: 13 Views: 2190 |
Forum: FOR BEGINNERS: What is it? Where is it from? Posted: Nov 24, 2018 13:38 Subject: Re: Black mineral ID help needed |
| I bet these small grains will stick a neodymium magnet but this will occur both with schorl and hornblende, not a useful test to distinguish between these minerals but will discard manganese oxides. | |
| Topic: Black mineral ID help needed |
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| Josele Replies: 13 Views: 2190 |
Forum: FOR BEGINNERS: What is it? Where is it from? Posted: Nov 23, 2018 18:58 Subject: Re: Black mineral ID help needed |
| Kara, did you find it in a pegmatite area? Could be micro-crystallized schorl.
Maybe you can check the hardness trying to scratch a bottle glass pressing hard and dragging an acute corner of the samp ... |
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| Topic: Black tourmaline in a fan shape |
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| Josele Replies: 13 Views: 2432 |
Forum: FOR BEGINNERS: What is it? Where is it from? Posted: Nov 10, 2018 13:03 Subject: Re: Black tourmaline in a fan shape |
| Here is the link:
Schorl from North Korea |
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| Topic: Collection of Fiebre Verde |
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| Josele Replies: 692 Views: 456082 |
Forum: Collection photos and Collector's page Posted: Nov 03, 2018 20:59 Subject: Re: Collection of Fiebre Verde |
| Lovely apatite Gérard, and from a unusual locality, thanks for sharing. It's a pleasure this pink touch in your green jungle.
Color and transparency reminds me some Baltistan apatites that are very f ... |
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| Topic: Noob....need a little guidance here... |
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| Josele Replies: 16 Views: 2610 |
Forum: FOR BEGINNERS: What is it? Where is it from? Posted: Oct 31, 2018 20:43 Subject: Re: Noob....need a little guidance here... |
| I have to disagree with Josele, not all agates are geodes.
... I do concur with Tobi in the sense that "geode" is a morphological term.Touché! ...Or maybe your flat agate is the excepti ... |
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| Topic: Noob....need a little guidance here... |
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| Josele Replies: 16 Views: 2610 |
Forum: FOR BEGINNERS: What is it? Where is it from? Posted: Oct 31, 2018 11:14 Subject: Re: Noob....need a little guidance here... |
| Coming back to the original question, I think that a proper name for these samples could be underdevelloped agate
To me, all agates are geodes (or were in a primary state, later collapsed) but not al ... |
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| Topic: inclusion in aquamarine? |
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| Josele Replies: 4 Views: 1059 |
Forum: FOR BEGINNERS: What is it? Where is it from? Posted: Oct 21, 2018 03:39 Subject: Re: inclusion in aquamarine? |
| Looks like schorl to me. Where is it from? | |
| Topic: Green crystals in Pegmatite? |
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| Josele Replies: 13 Views: 2376 |
Forum: FOR BEGINNERS: What is it? Where is it from? Posted: Oct 20, 2018 06:28 Subject: Re: green crystals in Pegmatite? |
| Hard to say without seeing any crystal face but in a pegmatite and with this color I think it could be tourmaline. Try to check the hardness... | |
| Topic: Large rocks on our property |
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| Josele Replies: 5 Views: 1617 |
Forum: FOR BEGINNERS: What is it? Where is it from? Posted: Sep 21, 2018 18:32 Subject: Re: Large rocks on our property |
| It looks like quartz but I think is not a conglomerate (sedimentary origin) but a boulder of massive quartz related to igneous rocks.
Matt, you can check hardness trying to scratch a bottle glass. ... |
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| Topic: Unidentified vitreous stone |
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| Josele Replies: 12 Views: 2510 |
Forum: FOR BEGINNERS: What is it? Where is it from? Posted: Sep 18, 2018 10:45 Subject: Re: Unidentified vitreous stone |
| After seeing this last photo, I would say it looks like an "aura quartz", that's a polished quartz pebble (natural) with a thin metallic exterior layer (artificial).
Polished stones can be ... |
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