Natrolite vs Achroite
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Natrolite
Natrolite is a zeolite-group tectosilicate mineral with the hydrated sodium aluminosilicate formula Na2Al2Si3O10·2H2O. It commonly forms colorless or white, slender needle-like crystals and can occur as radiating or fibrous aggregates in cavities and fractures of volcanic rocks. Natrolite is orthorhombic, has a Mohs hardness of about 5 to 6, and is commonly collected as a mineral specimen; its aci...
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Achroite
Achroite is the colorless variety of tourmaline. It is valued by mineral collectors because most tourmaline crystals show visible color, while achroite lacks the strong hues associated with varieties such as elbaite, schorl, or rubellite. It occurs chiefly in granitic pegmatites, including deposits reported from Madagascar, Brazil, and the United States.
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