Belomorite
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Belomorite, sometimes peristerite, moonstone, murchisonite, Ceylon opal, or hecatolite, is a decorative variety of albite of white or light gray color with a distinct iridescence effect. By compositio
Belomorite (Karelia, Chupinskaya Bay)
Belomorite (Chupa Bay, Karelia)
Ceylon «belomorite» («Ceylon opal»)
Feldspar
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Feldspar is a group of rock-forming aluminium tectosilicate minerals, also containing other cations such as sodium, calcium, potassium, or barium. The most common members of the feldspar group are the
Specimen of rare plumbian (lead-rich) feldspar
Crystallized white feldspar, with an upright 4 cm aquamarine crystal perched on it
Feldspar and moonstone, from Sonora, Mexico
A cluster of euhedral feldspar crystals with a schorl crystal