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Orthoclase
Orthoclase
Adularia (KAlSi3O8) with pyrite (FeS2) incrustations
Adularia (KAlSi3O8) with pyrite (FeS2) incrustations
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Feldspar crystal 18 cm × 21 cm × 8.5 cm (7.1 in × 8.3 in × 3.3 in) from Jequitinhonha valley, Minas Gerais, southeastern Brazil
Feldspar crystal 18 cm × 21 cm × 8.5 cm (7.1 in × 8.3 in × 3.3 in) from Jequitinhonha valley, Minas Gerais, southeastern Brazil
Specimen of rare plumbian (lead-rich) feldspar
Specimen of rare plumbian (lead-rich) feldspar
Crystallized white feldspar, with an upright 4 cm aquamarine crystal perched on it
Crystallized white feldspar, with an upright 4 cm aquamarine crystal perched on it
Feldspar and moonstone, from Sonora, Mexico
Feldspar and moonstone, from Sonora, Mexico