Mineral Of The Day #97: Oligoclase
- Oligoclase is a rock-forming mineral that is usually white with shades of red, grey, or green.
- It is named for the Greek oligos (little) and kasein (to break).
- Perfectly colorless and transparent oligoclase has been occasionally faceted as a gemstone. A red gemstone called sunstone is oligoclase with flashes of reddish color caused by inclusions of hematite.
An old (albeit enthusiastic!) note was found with the first specimen pictured above. It reads:
Sunstone deep pink
If you can get the right light on this, it is superlatively gorgeous. You seem to see miles down into it in a blaze of fire.
Black = magnetite