Zinc silicate

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A naturally occurring mineral that may be white, yellow, red, green, or brown depending on impurities. Hydrated zinc silicate ore, Hemimorphite, was directly mixed with copper for making brass. Zinc silicate ore is often found mixed with smithsonite (Zinc carbonate) resulting in the early name of Calamine being applied to both ores. Anhydrous zinc silicate ore is called Willemite. Zinc silicate is phosphorescent and is used in television screens.

Synonyms and Related Terms

zinc orthosilicate; willemite; calamine; hemimorphite; silicate de zinc (Fr.); Zinksilikat (Deut.)

Other Properties

Insoluble in water or dilute acids

Composition Zn2SiO4
CAS 13598-65-4
Mohs Hardness 4.5
Melting Point 1509
Density 4.103
Molecular Weight mol. wt. = 222.85

Sources Checked for Data in Record

  • G.S.Brady, Materials Handbook, McGraw-Hill Book Co., New York, 1971
  • Susan E. Schur, Conservation Terminology: A review of Past & Current Nomenclature of Materials, Technology and Conservation, Spring (p.34-39); Summer (p.35-38); Fall (p.25-36), 1985
  • The Merck Index, Susan Budavari (ed.), Merck Research Labs, Whitehouse Station, NJ, 12th Edition, 1996 Comment: entry 9964