 |
| 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.
 |
| 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.
 |
| 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.
 |
| Click on image to enlarge. |
Higher-magnification (40X objective) view of center of previous image. PPL. Imaged area 0.13 mm by 0.2 mm.
 |
| Click on image to enlarge. |
Optical Scan of remnants of hand specimen after removing material for billet for thin section. Imaged area 54 mm by 51 mm.
 |
| Click on image to enlarge. |
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.
