is a member of the feldspar mineral
family. Like Plagioclase Feldspar
, potassium feldspars are silicate minerals
that contain a considerable amount of potassium
. Feldspar crystals are stubby prisms, often pink
. Some potassium feldspars, such as the one shown to the left have a streaky appearance (see closeup) called perthitic texture.
- ↑ http://wrgis.wr.usgs.gov/docs/parks/rxmin/mineral.html#amphibole