Andalusite

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An old-time Alpine specimen (from the Tyrolean Alps in Austria, not Swiss) of blocky, rectangular, translucent crystals of andalusite (part of the sillimanite group (Al2SiO5 = Al[6]Al[5]OSiO4). The crystals are embedded in grey graphite schist. Frequently, these crystals show a cross-shaped pattern of light and dark inside. This locality in the Alps is known as a classic locality for andalusite.