Thanks for commenting, Steve, Jack, Attila, Paul, Ann, Bruce, Godfrey, Bob
W, Brian, Frank and Dan.
I asked a ranger what kind of minerals we were looking at, and told him I
suspected the tuquoise to contain a lot of copper. He could not confirm but
told me the purple stuff was manganese. According to Wikipedia, the green
stuff is mica, but that's a family of minerals that can have a lot of
different metallic "contaminants".
Jostein
-----Opprinnelig melding-----
From: Alunfoto - Jostein Øksne
Sent: Friday, November 22, 2013 3:44 PM
To: Pentax-Discuss Mail List
Subject: PESO - Minerals exposed
http://alunfoto.blogspot.no/2013/11/minerals-exposed.html
Jostein
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