This huge, clear topaz crystal weighing 5.5 kg has a perfect and sharp crystal shape (orthorhombic crystal system) with a diamond-shaped cross-section. It was mined from a prominent Brazilian pegmatite deposit. Its chemical composition is aluminium fluorine silicate.
12 x 17.5 x 17.5 cm
This specimen has been on continuous display in successive mineral exhibitions since its acquisition in 1941 through an exchange with Warner & Geiger, a Californian company supplying mineral specimens and noted for its pegmatite minerals.
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