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EducationCopper Both Near and Far second incarnation

14th Jan 2020 17:13 UTCRolf Luetcke Expert

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Hi Gareth, 
Since Jolyon closed the first thread, thought I continue in its second incarnation.   This cuprian adamite I just took this morning from Gold Hill Mine in Utah material a friend gave us.  Field of view is 5mm across.
In so many photos on mindat of Gold Hill Mine material, so many photos are on pseudomorphs of iron oxide after smithsonite but I have never actually seen a smithsonite from the mine, which I thought kind of odd.  Wonder if any original smithsonite is actually left somewhere in the mine?

16th Jan 2020 13:17 UTCRolf Luetcke Expert

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Here is a pseudomorph of chrysocolla after two distinct original minerals.  Think the bladed ones may be after azurite but not certain of this and the bundles may be after mixite but again, not sure of this.   There are tiny mixite crystals on the piece in acicular form and those green balls are an unidentified mineral.  Field of view is 4mm and the piece is from the Gold Hill Mine in Utah.

17th Jan 2020 19:12 UTCRolf Luetcke Expert

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This unstable mineral is from Bisbee and in this case was quite stable and has been in our collection unchanged for many years..   The chalcanthite came as a post mine deposit from underground.   The field of view here is 3x3cm.  Some other pieces that were gifts from one of the miners in Bisbee were not stable at all and started altering in less than a week and started turning to a powder rather quickly.

23rd Jan 2020 23:13 UTCRolf Luetcke Expert

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This broken piece of rosasite shows the internal habit of the mineral as it grew.  Field of view is 4mm and it is from an unnamed prospect near Portal, Cochise Co. Arizona and one I collected.

23rd Jan 2020 23:14 UTCRolf Luetcke Expert

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From the same location as the above photo, this piece was a tightly packed cluster of acicular malachite that was overgrown by a blue-green layer of rosasite.  Field of view is 4mm.
 
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