Spectrum Syntax
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Igneous Rocks
Igneous Rocks
Basalt
Igneous
Hardness: ≈6
Approximate
...
Granite
Igneous
Hardness: ≈6–7
Approximate
...
Obsidian
Igneous
Hardness: 5–6
...
Rhyolite
Igneous
Hardness: ≈6–7
Approximate
...
