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(mineralogy) Naturally-occurring silicon carbide, having various crystalline polymorphs.

Colorless, green, yellow – Generally found as inclusions in other minerals – (0001) indistinct – Conchoidal – fractures developed in brittle materials characterized by smoothly curving surfaces, e.g., quartz – ~9.5 – Adamantine to metallic – Greenish gray – Transparent – 3.218–3.22 – Nω = 2.654 nε = 2.967 – 0.313 (6H form) – 0.104 – Orange-red – 2730 °C (decomposes) – None – Not radioactive, diamagnetic.