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Search found 91 matches |
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Kevin Schofield Replies: 1 Views: 324 |
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Looking Good Forrest!! | |
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Kevin Schofield Replies: 3 Views: 1632 |
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looking at your photograph in detail, the associated mineral doesn't look like calcite unless it has been very etched (which is possible given that the copper has had its patina removed). The greenish ... | |
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Kevin Schofield Replies: 10 Views: 3851 |
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Hi Forrest...yes, that one has always intrigued me too.
It looks for all the world as if the original cores with the beige colour concentric growth and "coxcombe" barite surfaces were som ... |
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Kevin Schofield Replies: 10 Views: 3851 |
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I collected here with my father in the early seventies. Lots of galena, fluorite and calcite, but the prize pieces that I still have were the pink and white banded barites, of which I include a few pi ... | |
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Kevin Schofield Replies: 23 Views: 16941 |
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You are correct Herwig; I just don't have it in me to test the mineral Specimen with chemical means. The substance is likely toxic and could create fumes (?) and I do not have a fume hood.
My curr ... |
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Kevin Schofield Replies: 5 Views: 2622 |
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Looks like either calcite or quartz that has grown in a fault gouge, crystallizing in a pocket between the handingwall and footwall, changing orientation as the fault moved.
The tests that Bob sugg ... |
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Kevin Schofield Replies: 8 Views: 6483 |
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I bought this from a South African dealer who said he was pretty sure it was malachite after barite on dioptase from the DR Congo. I know malachite after barites were found in Mashamba West but they ... | |
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Kevin Schofield Replies: 6 Views: 3560 |
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Hi forum,
I am here seeking some help. Just to confirm Is this dolomite-pyrite-siderite? or something else? dim.: approx. 15 cm X 10 cm X 13 cm net weight: 1633 gr. origin: Unknown ... |
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Kevin Schofield Replies: 4 Views: 4274 |
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I have recently acquired multiple minerals and stones and need help identifying them. I'm new to this forum and hope that the experience of the members can point me in the right direction and teach me ... | |
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Kevin Schofield Replies: 21 Views: 13374 |
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Could it be charcoal or even coal?
I agree with you James...the very straight sides and right-angled edges on the larger piece look like cleat breakage, which would be typical of coal. Take that w ... |
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Kevin Schofield Replies: 4 Views: 5517 |
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Looks like an epimorph or perimorph of something. Find a broken crystal and see if you can work out the form of the mineral the epimorph covered
I agree with James that these look like epimorphs. ... |
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Kevin Schofield Replies: 5 Views: 5892 |
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Here is a closeup, I hope, of better quality.
Not really. It may help to know where it was found, but I think I can say with certainty that it isn't a sand rose of any sort, ancient or otherwis ... |
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Kevin Schofield Replies: 9 Views: 12237 |
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Following on from my post above, by an odd coincidence an article came up on my LinkedIn feed, pointing out the cover article from the magazine SCIENCE VOLUME 382| ISSUE 6673|24 NOV 2023 entitled &quo ... | |
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Kevin Schofield Replies: 9 Views: 12237 |
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Pete I have to contradict you. Your explanation of the replacement of calcite by dolomite during diagenesis was the ancient solution to the origin of dolomite formations such as the Dolomite Mountains ... | |
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Kevin Schofield Replies: 6 Views: 6019 |
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I found it in a rock pile at work. It’s pretty heavy I’d say nearly 90% is all geode. However as you can see it’s been roughed up scraping against rocks. My question is how do I polish it or get rid ... | |
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