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Identity Helptetragonal mineral.
2nd Jul 2012 01:42 UTChomer cole
2nd Jul 2012 04:14 UTCDavid Garske
Dave
2nd Jul 2012 08:38 UTCPeter Haas
Reminds me more of andalusite than pyrite.
30th Jun 2012 20:59 UTChomer cole
30th Jun 2012 21:09 UTCJolyon Ralph Founder
Jolyon
30th Jun 2012 21:29 UTCUwe Ludwig
Uwe Ludwig
1st Jul 2012 21:39 UTCBecky Coulson 🌟 Expert
2nd Jul 2012 08:33 UTCPeter Haas
I see nothing wrong with it - except that I don't think it's pyrite (and the matrix possibly not rhyolite). There is a damage along one edge of the crystal, and the reflections on it can lead one into thinking that the mineral has a golden colour. This taken aside (since we can't be really sure about it), there's nothing left to indicate that it is pyrite. The iron-staining does not necessarily indicate that the mineral is iron-bearing, because there's obviously plenty of iron in the host rock: note the colour along the cleavage plane, which is different from that of the bulk rock (as seen on top of the chunk). The iron does not appear to originate from the mineral in question, as this would have resulted in the formation of a more or less pronounced halo around the crystal.
2nd Jul 2012 09:19 UTCPeter Lyckberg Expert
2nd Jul 2012 12:04 UTCSpencer Ivan Mather
Spencer.
2nd Jul 2012 15:27 UTCD Mike Reinke
Where I used to live, a lot of the blacktopping on parking lots was done with crushed limestone in the mix, and the limestone was loaded with pyrite, so after some few weeks of rain and wear, the oil film was gone from the surface, and gleaming bits of pyrite, a quarter inch square or so, would reflect in the sunlight.. A quick geology lesson to anyone who I went with to Wal-mart. (Sorry; it was a small town, we had no choice!)
2nd Jul 2012 15:48 UTCAlfredo Petrov Manager
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