Astrophyllite

Unknown Owner

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Lustrous, diverging, metallic foil-like, golden-bronze astrophyllite blades are richly and superbly set in cabinet-sized pegmatite matrix from this well-known Colorado locality - St. Peters Dome. Astrophyllite is a rare potassium, sodium, iron, manganese, titanium silicate and these are large, up to 6.0 cm, crystals of the species and for the locality. The collection this came out of was a museum stash dating to prior to World War I.