Anorthosite
Rock
About it
Almost entirely plagioclase feldspar, with flat cleavage faces that catch the light; some shows blue labradorite flash. The pale highlands of the Moon are anorthosite; on Earth it is found in Labrador, Quebec, and the Adirondacks.
- Type
- Rock (igneous)
- Group
- Igneous (plutonic)
- Specific gravity
- 2.65–2.9
- Lustre
- vitreous (glassy)
- Colours
- white, light grey, dark grey, blue-grey, black
- Transparency
- opaque
Typical values: real specimens vary. For more, see mindat.org.