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Search found 702 matches |
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alfredo Replies: 28 Views: 3567 |
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Let's note too that Nature has no method for making loops of spheres like that. Spherules, whether their internal structure is radiating or concentric, start growing from a point in the center. How wo ... | |
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alfredo Replies: 28 Views: 3567 |
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On line discussions of fluorite "loops" came to the conclusion that they are carvings made from the fluorite hemispheres that occur in India. Easy enough to do nowadays with the air abrasive ... | |
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alfredo Replies: 4 Views: 446 |
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Reminds me a lot about the Swiss "strahlers" in the Alps - same environment, same working conditions, same alpine-type quartz finds. Amazing. | |
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alfredo Replies: 9 Views: 903 |
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Get it professionally analysed and make sure it really is cookeite, and not the closely related species borocookeite! When the pink tourmalines from Malkhan in Siberia started coming out, dealers quic ... | |
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alfredo Replies: 9 Views: 903 |
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Cookeite is a member of the chlorite group, not a mica. I've dissolved other chlorites (clinochlore-chamosite) in hot sulphuric acid, but whether that would also work on cookeite, I'm not sure. | |
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alfredo Replies: 8 Views: 879 |
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The pink ones look like rose quartz. | |
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alfredo Replies: 22 Views: 2577 |
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Don't waste your money on a thermal conductivity "diamond tester". They are designed for use on the flat polished facets of gemstones and give very unreliable results on rough stones and cry ... | |
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alfredo Replies: 20 Views: 7410 |
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What you have there is concentric layers of iron oxide, nothing related to melanophlogite, chayesite, osumilite, nor cordierite. Indeed a curious rock - I'd keep it too if I found it - but nothing wit ... | |
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alfredo Replies: 14 Views: 1499 |
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https://www.mindat.org/mesg-506598.html
Sorry, it's a bit facetious, but... |
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alfredo Replies: 14 Views: 1499 |
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It's not a diamond, so don't waste your money buying a diamond tester. They don't work reliably on rough surfaces anyway, they're designed for use on polished gemstone facets. | |
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alfredo Replies: 18 Views: 26816 |
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Chalcedony/Quartz nodules are abundant on some parts of the slopes of Mt Meron, looking like cauliflower on the outside, occasionally with hollow centers. Nothing terribly exciting. | |
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alfredo Replies: 6 Views: 1161 |
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As David points out, "Silverstone" is likely an error for Silverton, and Silverton has plenty of sphalerite and chalcopyrite, which this specimen appears to be. It does not look to me like z ... | |
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alfredo Replies: 6 Views: 1161 |
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I too suspect sphalerite. | |
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alfredo Replies: 10 Views: 1703 |
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There are thousands of mineral species found at only one locality: henmilite, ferrivauxite, nikischerite, favreauite, petermegawite... to name only a few that I've happened to be looking at recently, ... | |
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alfredo Replies: 10 Views: 1500 |
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Around a hundred or so new mineral species are approved by the International Mineralogical Association every year. ("IMA approval" is only given after scientists have studied the material su ... | |
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alfredo Replies: 4 Views: 796 |
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Pete, does the white porcellanous matrix fluoresce dull red under SW UV light? (If so, it's probably feldspar and an aplitic or pegmatitic origin is more likely.) | |
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alfredo Replies: 1 Views: 757 |
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Perhaps not what you want to hear but, based on the color, luster, surface texture, interior bubbles, and sand incorporated into some surfaces - I think it's a beer bottle melted in a fire. I've found ... | |
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alfredo Replies: 16 Views: 2791 |
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I think John has got it! Check these photos here: https://www.mindat.org/gallery.php?loc=14241&min=549
Thanks. I am not familiar with this locality. |
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alfredo Replies: 16 Views: 2791 |
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Looks like barite to me. | |
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alfredo Replies: 11 Views: 2714 |
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I agree with Joseph that the little tabular white crystals are stilbite. | |
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