Gabbro
Rock
Also called Black granite (trade name)
About it
Dark, coarse-grained rock of grey plagioclase and black pyroxene, the slowly cooled equivalent of basalt. It makes up the lower ocean crust and is often sold as black granite for countertops.
- Type
- Rock (igneous)
- Group
- Igneous (plutonic)
- Specific gravity
- 2.8–3.2
- Colours
- dark grey, black, greenish black
- Transparency
- opaque
Typical values: real specimens vary. For more, see mindat.org.