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because the grains are relatively large and not well rounded
An excellent plate
with the black looking just like weathered obsidian
with its natural purplish oxidized surface
kyanite crystals in quartz - São José de Safira, Minas Gerais, Brazil - hand specimen because the grains are relativelykyanite 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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