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A rock's hardness is usually measured in compressive fracture strength rather than a Mohs hardness which measures a mineral's relative hardness in comparison to other minerals. ASTM standard tests have rated gneiss at 50-200 MPa (roughly 350-1400 psi), a range lower than slate, quartzite, or basalt.

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15y ago
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10y ago

The hardness of metagabbro, or schists, depends on their composite minerals.

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9y ago

The hardness of gabbro is 6.

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9y ago

Gabbro is a 6.

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11y ago

4 to 6

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Q: What is the hardness of gabbro in mohs hardness scale?
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It's called the Ore


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