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Search found 538 matches |
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Matt_Zukowski Replies: 7 Views: 648 |
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Can you tell us what the two minerals are that make up the matrix? Are you sure it comes from PAK? | |
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Matt_Zukowski Replies: 4 Views: 466 |
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It sure looks like a chunk of quartz, but one cannot tell just by looking at a picture that doesn't show good crystal faces and the relations between them.
The odds that you found a diamond in your ... |
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Matt_Zukowski Replies: 10 Views: 890 |
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I agree that this is likely to be artificial. The only way i thought it could be natural is for it to be some sort of vesicular volcanic with the beads being quartz or something filling the vesicles. ... | |
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Matt_Zukowski Replies: 6 Views: 860 |
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I agree with Alfredo - it looks like a layered volcanic with obsidian and pumice. | |
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Matt_Zukowski Replies: 10 Views: 1287 |
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My initial reaction is Naica, but the pic looks a little too blurry to me to really see the habit of either the fluorite or galena. You may get a better response if you provide some closeups of both ... | |
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Matt_Zukowski Replies: 13 Views: 2011 |
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Michael Shaw pulled out an amazingly similar photo to your piece suggesting that it may well be titanium (good catch Michael!). If i *had* to guess, i would say that that is what it is. But it is st ... | |
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Matt_Zukowski Replies: 9 Views: 1754 |
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Am I the only one frustrated by this thread? Some guy shows us a box of broken up quartz rock, lists a bunch of characteristics that are mostly, seemingly just generic for quartz, and asks us if this ... | |
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Matt_Zukowski Replies: 6 Views: 1113 |
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You should look at your pictures before you post them. They are impossibly blurry.
That said - it is probably pyrite. To learn more about pyrite, go to the mindat page on pyrite: https://www.min ... |
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Matt_Zukowski Replies: 7 Views: 1786 |
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A good website that you may not know about is Mindat. You can look up any mineral and learn all about it, find all the minerals reported in a particular locality like a single mine or a state, and ma ... | |
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Matt_Zukowski Replies: 2 Views: 962 |
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I have never heard the term "honey calcite" before, but there is plenty of honey-colored calcite around. If you are concerned, do an acid test to see if it is calcite. | |
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Matt_Zukowski Replies: 8 Views: 2745 |
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The mottled grey mineral in 20211025_215604.jpg and 20211025_215836.jpg is quartz.
The golden platy mineral in 20211025_215743.jpg and 20211025_215815.jpg is muscovite. The black platy-looking m ... |
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Matt_Zukowski Replies: 6 Views: 2133 |
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These are probably glass slag. | |
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Matt_Zukowski Replies: 4 Views: 2091 |
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I just read this article and thought it would be of general interest to this group. I especially like the picture from Pulpí, Spain.
https://cen.acs.org/physical-chemistry/geochemistry/Naicas-crysta ... |
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Matt_Zukowski Replies: 5 Views: 2242 |
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What else in on the piece. Is the orange stuff orpiment? There is some off-white/maybe yellowish material, is this quartz? | |
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Matt_Zukowski Replies: 15 Views: 3977 |
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Like Lluis and Alfredo, my first impression was that this sounds like snake oil. But the authors are at good universities (MIT and Purdue) and the paper was published in a good peer-reviewed journal. ... | |
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Matt_Zukowski Replies: 11 Views: 3540 |
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Sometimes stilbite can present with chlorite inclusions, but your piece doesn't look like any of this material that i have seen. That said, all i have is to go on is one picture, so perhaps my impres ... | |
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Matt_Zukowski Replies: 8 Views: 2613 |
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I doubt we will be able to help you further. I recommend you go to a Univ or museum and talk to someone in person with the rock in hand. | |
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Matt_Zukowski Replies: 14 Views: 3795 |
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If the dealer is still active, why not contact them and ask why they think it is Tuscan? | |
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Matt_Zukowski Replies: 10 Views: 3229 |
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Could be from many localities. Can you constrain the locality? Is it likely from Europe, or could it be from anywhere in the world? | |
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Matt_Zukowski Replies: 6 Views: 2191 |
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If you know the locality, you can go to the mindat page for that locality, and look through pictures of specimens with their identified minerals from that locality. | |
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