A Geoscience Digital Image Library
A Geoscience Digital Image Library
| Title | Orthoclase in granite |
|---|---|
| Description | Orthoclase belongs to the feldspar group. It is a polymorph of other minerals that share the same chemistry, but have different crystal structures. Orthoclase is the main k-spar of granites and syenites that cooled moderately quickly. Twinning is common in all feldspars and Carlsbad twinning is more common in orthoclase. Orthoclase comes from the Greek, orthos, meaning “right” and, kalo, meaning “I cleave” in allusion to the mineral's right angle of good cleavage. |
| Location | USA ▹ Montana. Near Bear Tooth Pass. |
| Photographer | Shannon Heinle. 2002-09-13. |
| Collection | University of North Dakota Mineralogy Collection #5014. |
| Key words | orthoclase, feldspar, twinning |
| Tech details | 724 KB. Fujifilm FinePix S1Pro digital camera; 60mm AF Nikon micro lens. |
| GeoDIL number | 2925 |
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