#hudson higlands

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This rock is a quartzofeldspathic gneiss from Surebridge Mine in Harriman State Park, NY. What’s so cool about this is you can see the hydrothermal process which alters biotite to chlorite. The large brown grain being biotite, and the purple/blue/green in the center being chlorite. (10x XPL)

#geology #mineralogy #geochemistry #minerals #earth science #geologist #optical mineralogy #physics #volcano #aestheitcs #petrology #chemistry #optmin #nature #new york #hudson higlands #harriman state park #granite #gneiss #biotite #biotite mica #chlorite #chlorite mica #quartzofeldspathic gneiss 
Optical Mineralogy@optical-mineralogy
Mon, 26 Nov 2018 00:38:07
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