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An aluminium hydrate α-AlO(OH), forming a continuous series with its polymorph boehmite γ-AlO(OH); sp. gr. 3.3–3.5; hardness 6.5–7.0; white; massive or foliaceous or as orthorhombic prismatic crystals; it is a constituent of bauxite and laterite deposits along with emery and corundum.

Subjects: Earth Sciences and Geography — Biological Sciences.

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