Tanzanite is a blue-violet variety of the mineral zoisite. It is known for its striking trichroism (displaying three different colours when viewed from different angles). Its composition is calcium aluminium silicate. Tanzanite is a relatively recent discovery, first found in 1967. This gemstone is exclusively found in the Merelani Hills of Tanzania, near Mount Kilimanjaro, the only known source in the world, making it a rare and valuable gemstone.
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