October 13, 2023
WEBERITE, CRYOLITE, PROSOPITE: ST. PETER'S DOME, COLORADO- VERY RARE Al-FLUORIDE
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For your consideration is this nice specimen of white cryolite with patches of reddish Weberite, and gray prosopite with minor fluorite and microcline feldspar from the 65-2 Pegmatite or 'Cryolite pegmatite' on Saint Peter's Dome, El Paso County, Colorado. A good example of this unusual Al-fluoride assemblage from the classic American locality, from an older collection. Sawn on one side. Very Rare!!Specimen Dimensions: 9.5 x 4.5 x 2.7 cm. Weight: 201 grams.
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