what do i have here ? |
Colorado Prospector - Gem and mineral prospecting and mining forums > Prospecting, Mineral Collecting and Treasure Hunting Forums > Gem and Mineral Specimen Finds or Processes  |
what do i have here ? |
 Mar 18 2022, 09:50 AM
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#1
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Diggin' In!  Group: Members Posts: 30 Joined: 8-January 13 From: Denver Member No.: 51,779  |
see attached . . .
Long time lurker ... occasional panner. But found this pretty rock. Wonder what all the colors mean.
Attached thumbnail(s)
-------------------- -dbx-
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Mar 18 2022, 07:38 PM
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#2
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Rock Bar! Group: Members Posts: 563 Joined: 13-June 15 From: South of Gunnison in Gold Basin, Saguache County Member No.: 120,659 |
Hard to tell but looks similar to oxidized copper.
-------------------- Level 2 member -12/25/16
Referral code JL697 |
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Mar 19 2022, 09:42 AM
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#3
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 Master Mucker! Group: Admin Posts: 7,197 Joined: 7-October 03 From: Colorado Member No.: 4 |
Cool rock! Very hard to tell by just the picture but looks a bit like Zeolites to me the way the white crystals fan out.
 ![confused0082[1].gif](style_emoticons/default/confused0082[1].gif)  Nice find!
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Apr 1 2022, 12:00 PM
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#4
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 Rock Bar! Group: Members Posts: 730 Joined: 6-July 14 From: Grant, CO Member No.: 117,890 |
Looks like some kinda copper related mineral to me.
Or perhaps (after looking closer at the first pic) really decayed pyrite. -------------------- - You Rock! (Literally)
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Sep 2 2022, 12:08 AM
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#5
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Diggin' In! Group: Members Posts: 9 Joined: 3-January 22 Member No.: 225,633 |
Looks to be partially oxidized Chalcopyrite. It could also be some Magnetite. The early smelters would use course Magnetite, FeO. as a flux in sulphide ores. It adsorbs the sulphur from the pyrite, leaving the Gold behind to get collected by the Lead. The smelting process leaves the Magnetite looking like a mass of sulphide . If you get a good tone from a decent Gold detector, it is probably Magnetite. You can also get a good detector tone from a pyritic Gold sample, if the Gold is 3-5 ounces minimum, per ton, is what I am finding out. Easy test, a magnet will attract to Magnetite, not to sulfides though.
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Sep 6 2022, 07:26 PM
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#6
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Diggin' In! Group: Members Posts: 9 Joined: 3-January 22 Member No.: 225,633 |
QUOTE (Goldshark @ Sep 2 2022, 01:08 AM)  Looks to be partially oxidized Chalcopyrite. It could also be some Magnetite. The early smelters would use course Magnetite, FeO. as a flux in sulphide ores. It adsorbs the sulphur from the pyrite, leaving the Gold behind to get collected by the Lead. The smelting process leaves the Magnetite looking like a mass of sulphide . If you get a good tone from a decent Gold detector, it is probably Magnetite. You can also get a good detector tone from a pyritic Gold sample, if the Gold is 3-5 ounces minimum, per ton, is what I am finding out. Easy test, a magnet will attract to Magnetite, not to sulfides though. It also looks like a typical ore specimen from the Silverton, Colo. area. |
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