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Tyrol, Austria
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Amphibole, Tyrol, Austria. A 5.5 x 3.5 x 1.5 cm specimen of amphibole, a large family of silicate minerals (double-chain inosilicates) rich in iron, magnesium or calcium. Found in igneous and metamorphic rocks, they are recognisable by their elongated prismatic or needle-like shape and their often dark colour.