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In the mix: sphalerite/wurtzite

Mixture of wurtzite and sphalerite from: Horn Silver Mine, Frisco, San Francisco District, San Francisco Mts, Beaver Co., Utah, USA.

When Don Newsome visited me in 2002 he gave me this specimen as a door prize. It's very strongly triboluminescent ! (you can see the scratchmarks.)

The orange fluorescence is probably wurtzite, the violet stuff sphalerite. Photo in SW-UV.

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