Forums
New posts
Search forums
What's new
New posts
Latest activity
Members
Registered members
Current visitors
Charts
Log in
Register
What's new
Search
Search
Search titles only
By:
New posts
Search forums
Menu
Log in
Register
Install the app
Install
Gemstones, Minerals & Fossils
Gemstones and Minerals
Identification please
JavaScript is disabled. For a better experience, please enable JavaScript in your browser before proceeding.
You are using an out of date browser. It may not display this or other websites correctly.
You should upgrade or use an
alternative browser
.
Reply to thread
Help Support Prospecting Australia:
This site may earn a commission from merchant affiliate links, including eBay, Amazon, and others.
Message
<blockquote data-quote="user 4386" data-source="post: 660262" data-attributes="member: 4386"><p>I don't think I suggested bronze - my guess is native copper but hardness alone would be fairly diagnostic, combined with the colour change. Native copper does not react with common acids at room temperature but does react slightly with acetic acid (vinegar):...</p><p></p><p>[ATTACH=full]6987[/ATTACH]</p><p></p><p>I suspect the actual reaction of the surface layer formed is with oxygen from the air to form green brochantite (a hydrous sulphate) - there is often sulphate ion around ore deposits - or with carbon dioxide from the air or soil, to give things like malachite (copper carbonate).</p></blockquote><p></p>
[QUOTE="user 4386, post: 660262, member: 4386"] I don't think I suggested bronze - my guess is native copper but hardness alone would be fairly diagnostic, combined with the colour change. Native copper does not react with common acids at room temperature but does react slightly with acetic acid (vinegar):... [ATTACH type="full"]6987[/ATTACH] I suspect the actual reaction of the surface layer formed is with oxygen from the air to form green brochantite (a hydrous sulphate) - there is often sulphate ion around ore deposits - or with carbon dioxide from the air or soil, to give things like malachite (copper carbonate). [/QUOTE]
Verification
Post reply
Gemstones, Minerals & Fossils
Gemstones and Minerals
Identification please
Top