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| Search found 199 matches |
| Author | Message |
|---|---|
 Topic: Faden article |
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| Josele Replies: 3 Views: 259 |
 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: 287 |
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: 1110 |
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: 1110 |
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: 1307 |
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: 680 Views: 379853 |
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: 1468 |
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: 1468 |
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: 602 |
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: 1337 |
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: 898 |
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: 1517 |
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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| Topic: Unidentified vitreous stone |
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| Josele Replies: 12 Views: 1517 |
Forum: FOR BEGINNERS: What is it? Where is it from? Posted: Sep 18, 2018 07:08 Subject: Re: Unidentified vitreous stone |
| ... Labradorite is dark green and mostly opaque. This stone is clear and colourless. Labradorescence only occurs in one plane and usually displays shades of yellow, green, and blue. This stone display ... | |
| Topic: Unidentified vitreous stone |
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| Josele Replies: 12 Views: 1517 |
Forum: FOR BEGINNERS: What is it? Where is it from? Posted: Sep 17, 2018 20:03 Subject: Re: Unidentified vitreous stone |
| Could be Labradorite. | |
| Topic: Possible slag |
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| Josele Replies: 2 Views: 734 |
Forum: FOR BEGINNERS: What is it? Where is it from? Posted: Sep 16, 2018 17:28 Subject: Re: Possible slag. |
| It seems that there are many bubbles in the lower half seen on first photo that would reveal a glass slag. | |
| Topic: Who to trust with gemstone identification? Are some gemologists better than others? |
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| Josele Replies: 11 Views: 1321 |
Forum: Incorrect classification and fakes Posted: Sep 07, 2018 10:10 Subject: Re: Who to trust with gemstone identification? Are some gemologists better than others? |
| ..., I have a piece of Citrine that I wanted to make certain was genuine, and not baked Amethyst. ...
Adrian, some photos of the "citrine" in question will help to know what we are talking ... |
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| Topic: New find ID help |
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| Josele Replies: 10 Views: 1720 |
Forum: FOR BEGINNERS: What is it? Where is it from? Posted: Sep 05, 2018 14:33 Subject: Re: New find ID help |
| Another vote for basalt, which usually contains enough magnetite to be attracted by a magnet. | |
| Topic: Unknown rock and mineral?? |
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| Josele Replies: 5 Views: 1294 |
Forum: FOR BEGINNERS: What is it? Where is it from? Posted: Aug 22, 2018 14:50 Subject: Re: Unknown rock and mineral?? |
| Welcome to FMF!
Can't see very well the crystals lining the pocket but in the first photo some reflections look like rhombohedral faces of quartz to me. You can check by trying to scratch a glass wi ... |
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| Topic: Could anyone identify this stone? |
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| Josele Replies: 12 Views: 1668 |
Forum: FOR BEGINNERS: What is it? Where is it from? Posted: Aug 17, 2018 07:35 Subject: Re: Could anyone identify this stone? |
| Really looks like a piece of flint / chert (sedimentary siliceous rock).
Can check it trying to scratch a bottle glass with it. If glass stays permanent scratched will be as said. Regards. |
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| Topic: Dog tooth calcite from where? |
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| Josele Replies: 8 Views: 1007 |
Forum: FOR BEGINNERS: What is it? Where is it from? Posted: Aug 14, 2018 06:39 Subject: Re: dog tooth calcite |
| Size is in mm or cm?
Some testing and a closeup in higher resolution of the blue stuff will help. |
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