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pyromorphite and others

Pyromorphite is a pseudomorph after galena and cerussite and takes the form of these minerals which it replaces.  It is found in association with lead. 

The phosphate called vanadinite is formed by water which alters the lead ore.  I do have a very nice sample of this somewhere in my collection.  The crystals can be many colors, usually a cinnamon brown.  As far as lead is concerned, vanadinite can be found in commercially viable amounts.  Torbernite is hydrous copper uranium phosphate, and autunite is hydrous calcium uranium phosphate.  The two occur together.  Torberite is bright green.  Autunite is greenish or yellowish and is vividly fluorescent.  

And so I've come to the end of the phosphates.  Next I will dispose of the chromates.  When will I get around to collecting all of these?  Should I blog about rocks next, as opposed to minerals?

Posted by oh5/ojhoff at 8:22 PM CST
Updated: 03/19/10 11:06 PM CDT
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