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Home > Art, Film & Photography > Calcite Group: Calcite, Magnesite, Siderite, Smithsonite, Otavite
Calcite Group: Calcite, Magnesite, Siderite, Smithsonite, Otavite

Calcite Group: Calcite, Magnesite, Siderite, Smithsonite, Otavite


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About the Book

Chapters: Calcite, Magnesite, Siderite, Smithsonite, Otavite. Source: Wikipedia. Pages: 23. Not illustrated. Free updates online. Purchase includes a free trial membership in the publisher's book club where you can select from more than a million books without charge. Excerpt: Calcite is a carbonate mineral and the most stable polymorph of calcium carbonate (CaCO3). The other polymorphs are the minerals aragonite and vaterite. Aragonite will change to calcite at 470 C, and vaterite is even less stable. Doubly terminated calcite crystalCalcite crystals are trigonal-rhombohedral, though actual calcite rhombohedra are rare as natural crystals. However, they show a remarkable variety of habits including acute to obtuse rhombohedra, tabular forms, prisms, or various scalenohedra. Calcite exhibits several twinning types adding to the variety of observed forms. It may occur as fibrous, granular, lamellar, or compact. Cleavage is usually in three directions parallel to the rhombohedron form. Its fracture is conchoidal, but difficult to obtain. It has a Mohs hardness of 3, a specific gravity of 2.71, and its luster is vitreous in crystallized varieties. Color is white or none, though shades of gray, red, yellow, green, blue, violet, brown, or even black can occur when the mineral is charged with impurities. Calcite is transparent to opaque and may occasionally show phosphorescence or fluorescence. A transparent variety called Iceland spar is used for optical purposes. Acute scalenohedral crystals are sometimes referred to as "dogtooth spar." Single calcite crystals display an optical property called birefringence (double refraction). This strong birefringence causes objects viewed through a clear piece of calcite to appear doubled. The birefringent effect (using calcite) was first described by the Danish scientist Rasmus Bartholin in 1669. At a wavelength of 590 nm calcite has ordinary and extraordinary refractive indices of 1.658 a...More: http: //booksllc.net/?id=44603


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Product Details
  • ISBN-13: 9781158350971
  • Publisher: Books LLC
  • Publisher Imprint: Books LLC
  • Height: 152 mm
  • Sub Title: Calcite, Magnesite, Siderite, Smithsonite, Otavite
  • Width: 229 mm
  • ISBN-10: 115835097X
  • Publisher Date: 15 Sep 2010
  • Binding: Paperback
  • Spine Width: 2 mm
  • Weight: 50 gr


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