harvestmoon
off to a rocking start
Member since October 2023
Posts: 2
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Post by harvestmoon on Oct 7, 2023 17:30:41 GMT -5
Had these in my collection for awhile now and would like to know what they are exactly. I believe they are Rosasite but no expert. ibb.co/rMvdcpx
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Post by jasoninsd on Oct 7, 2023 19:44:56 GMT -5
Here's your pic... Welcome to the forum from South Dakota! The color is the "copper" color...which is right for Rosasite. (Take my ID skills with a grain of salt though! )
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Post by vegasjames on Oct 8, 2023 4:03:12 GMT -5
I find a lot of rosasite locally, but it is all a sky blue.
If you know where these came from, you can start by checking on Mindat to see if rosasite is even known at that location.
Otherwise, you will probably have to do some chemical testing to see if this is a carbonate to begin with, and if it contains zinc.
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Post by rockjunquie on Oct 8, 2023 10:20:01 GMT -5
I find a lot of rosasite locally, but it is all a sky blue. If you know where these came from, you can start by checking on Mindat to see if rosasite is even known at that location. Otherwise, you will probably have to do some chemical testing to see if this is a carbonate to begin with, and if it contains zinc. I knew you'd have the answer.
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Post by vegasjames on Oct 9, 2023 2:03:11 GMT -5
The sky blue in these specimens is rosasite.
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Post by rmf on Oct 14, 2023 6:05:15 GMT -5
FWIW if you are close to a place that does scrap metal recycle or gold/silver purchases check to see if the have an XFR analyzer. That might give you the Cu and Zn ratios to prove Rosasite. From Wikipedia: Rosasite is a carbonate mineral with minor potential for use as a zinc and copper ore. Chemically, it is a copper zinc carbonate hydroxide with a copper to zinc ratio of 3:2, occurring in the secondary oxidation zone of copper-zinc deposits. It was originally discovered in 1908 in the Rosas mine in Sardinia, Italy, and is named after the location. Fibrous blue-green rosasite crystals are usually found in globular aggregates, often associated with red limonite and other colorful minerals. It is very similar to aurichalcite, but can be distinguished by its superior hardness. H=4
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