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white, glassy silicate mineral that commonly occurs as masses or tabular crystals with other calcium-containing silicates (e.g., diopside, tremolite, garnet, and epidote) in metamorphosed limestones. Deposits are found in Ciclova Romina, Rom.; Monte Somma, Italy; and Pargas, Fin. Occurrences in the United States include Utah; Isle Royale, Mich.; Riverside, Calif.; and Essex county, N.Y., where it is mined. For detailed physical properties, see silicate mineral (table)