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New Mexico and Arizona
with the black looking just like weathered obsidian
An excellent plate
optically clear polystyrene with screw caps
In the field photo
kyanite crystals in quartz - São José de Safira, Minas Gerais, Brazil - hand specimen New Mexico and Arizonakyanite Al2SiO5 Kyanite forms when aluminum rich rocks are metamorphosed, and is frequently found in schists that formed at medium to high pressures and lower temperatures in areas of regional metamorphism. At higher temperatures, kyanite converts to sillimanite. Occasionally the metamorphism produces a pegmatite with large crystals that form when a fluid rich magma allows rapid movement of atoms. These large crystals of kyanite and the surrounding
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