Silicon carbide
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Silicon carbide, also known as carborundum, is a hard chemical compound of silicon and carbon. A wide bandgap semiconductor, it occurs in nature as the extremely rare mineral moissanite, but has been
Sample of silicon carbide as a boule
A replication of H.J. Round's LED experiments
Synthetic SiC crystals ~3 mm in diameter
Two six-inch (≈ 15 cm) wafers made of silicon carbide
Corundum
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Corundum is a crystalline form of aluminium oxide typically containing traces of iron, titanium, vanadium, and chromium. It is a rock-forming mineral. It is a naturally transparent material, but can h
Silicon carbide
…operate at high temperatures, high voltages or both. Naturally occurring moissanite is found in only minute quantities in certain types of meteorite, corundum deposits and kimberlite. Virtually all the silicon carbide sold in the world, including moissanite jewelry, is synthetic. Natural moissanite was first…
Several corundum crystals
Corundum from Brazil, size about 2 cm × 3 cm (0.8 in × 1 in)