Amphibolite
Rock
About it
Dark, heavy, coarse rock mostly of black hornblende and plagioclase, often with a shiny, lined-up grain, formed from basalt or gabbro. The big garnets of Gore Mountain, New York, grow in amphibolite.
- Type
- Rock (metamorphic)
- Group
- Metamorphic (foliated)
- Specific gravity
- 2.9–3.1
- Colours
- black, dark green, black and white
- Transparency
- opaque
Typical values: real specimens vary. For more, see mindat.org.