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| Click on image to enlarge. Specimen: Michael Davis Photo: Dan Snyder |
Olivine (left and right) with interstitial pyroxene (center). Note that opaque secondary mineral(s) occupying fractures in olivine do not extend through pyroxene. Montserate Mountain, San Diego County, California. XPL. Imaged area 1.3 mm x 2 mm.
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| Click on image to enlarge. |
Plane-polarized light image of same area shown above. Fractures appear to end at the olivine/pyroxene border. In the center of the image, the pyroxene is colored by parallel streaks of a red material, probably iddingsite, a late magmatic alteration product of olivine.
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| Click on image to enlarge. |
Higher-magnification (10X objective) view of center of previous image. PPL. Imaged area 0.54 mm by 0.8 mm.
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Higher-magnification (40X objective) view of center of previous image. PPL. Imaged area 0.13 mm by 0.2 mm.
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Optical Scan of remnants of hand specimen after removing material for billet for thin section. Imaged area 54 mm by 51 mm.
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Optical scan of outside of hand specimen minus billet material. Red material appears to be iddingsite. Imaged area 57 mm by 51 mm.
Many thanks to Prof. Michael Davis of the University of California at Riverside for the specimen.
I recently came across your blog and have been reading along. I thought I would leave my first
ReplyDeletecomment. I don't know what to say except that I have enjoyed reading. Nice blog.
I will keep visiting this blog very often.
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Thank you for your comment, Saad. I'm glad you like the blog. If you have any suggestions, or any specimens you would like me to photograph and post, please let me know. ...Dan S
DeleteThird year geology undergrad here - your blog has really helped me study for my petrology lab exam! Thanks Dan!
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