Gneiss
Gneiss is a rock. It has a Mohs hardness of 6 to 7 and variable, typically dull to lustrous luster.
Gneiss properties
| Type | Rock |
|---|---|
| Mohs hardness | 6 to 7 |
| Luster | variable, typically dull to lustrous |
| Typical colors | often banded, colors include gray, white, pink, and black |
| Formation | metamorphic, formed from the alteration of granite or volcanic rock under high-grade metamorphic conditions |
| Rarity | 4 / 10 |
Mohs hardness 6–7 — hard
1 · Talc5 · Apatite10 · Diamond
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