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Between two thick paper sheets
the swallowtails
These are useful as teaching specimens
If tiny rhombs would be useful in your classroom
Tuffs are light colored
kyanite crystals in quartz - São José de Safira, Minas Gerais, Brazil - hand/display specimen Between two thick paper sheetskyanite 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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US$ 35.00
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