Basalt

Basalt
Wikimedia Commons

Basalt

Igneous

Hardness: ≈6 Approximate

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GraniteObsidianRhyolite

Basalt is a dark, fine-grained volcanic rock rich in plagioclase and pyroxene; it forms from fast-cooling, low‑silica lava and makes up much of the oceanic crust.

Parent: Igneous Rocks

Related: Granite, Obsidian, Rhyolite

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