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Identity HelpUnknowns from Cornwall

24th Jun 2012 21:15 UTCAlan Barnes (2)

I have a large cabinet sized specimen of uraninite from St. Terras Mine in Cornwall. Sat on the quartz matrix are two blue, presumably copper, minerals. Do any of you Cornish experts know what these two minerals are? One is a pale blue whilst the other is a much darker blue. There are no crystals because I broke a huge specimen in two and the blue patches were found in between the tightly packed quartz crystals. The very small amount of these minerals on the specimen has prevented me from being able to do a streak test so unfortunately I can't offer anything scientific that might help people identify the minerals........but if anybody has any ideas I'd be glad to hear them


Best wishes,

Alan

24th Jun 2012 21:28 UTCJolyon Ralph Founder

Welcome to the world of the Blue/Green Grotties. Could be malachite, chrysocolla, connellite, botallacite, atacamite, paratacamite, brochantite or one of a dozen others. Unlikely to be able to identify it much further without some chemical work (eg dissolving in acid)

Jolyon

24th Jun 2012 22:16 UTCRowan Lytle

Maybe a uranium secondary, being with uraninite?

1st Jul 2012 20:32 UTCAmanda Hawkins

Rashleighite?

1st Jul 2012 21:09 UTCSteve Rust Manager

I love these green grotty things you never know what thy might be,

I would guess at something like Brochantite/Malachite on Native Copper for the 1st photo

The 2nd photo could be Malachite, it can be very pale green, or my be completely some thing else.


Steve
 
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