Almandine

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almandine

Contents

Description

A red garnet composed of iron aluminum silicate. Almandine can range in color from pale violet to bright red to purplish to brownish black. It was popular as a gem in Roman times and was also commonly found in Egypt. Gemstone quality almandine is mined in Asia Minor, Sri Lanka, Australia, Alaska, Africa, Norway, Sweden, and Japan. It is frequently cut en cabochon then called carbuncle.

Synonyms and Related Terms

almandite; carbuncle; garnet; Ceylon ruby; Syrian garnet; Australian ruby; alabandicus (Pliny); Almandine (Deut.); almandino (Esp.); almandyn (Pol.); almandina (Port.); almandien (Ned.)

Raman

AlmandineRS.jpg


Other Properties

Fracture = conchoidal. Luster = vitreous to resinous. Streak = colorless. Birefringence = none. Dispersion = 0.024. Pleochroism = none. UV fluorescence = inert

Composition Fe3Al2Si3O12
Mohs Hardness 7.0-7.5
Density 4.05 - 4.3
Refractive Index 1.79-1.83

Additional Information

Mineralogy Database: Almandine

Comparisons

Properties of Gemstones


Sources Checked for Data in Record

  • G.S.Brady, Materials Handbook, McGraw-Hill Book Co., New York, 1971 Comment: p. 752
  • Encyclopedia Britannica, http://www.britannica.com Comment: 'almandine" from Encyclop√¶dia Britannica Premium Service. [Accessed May 8, 2003
  • C.W.Chesterman, K.E.Lowe, Audubon Society Field Guide to North American Rocks and Minerals, Alfred A. Knopf, New York, 1979
  • Sue Fuller, Rocks and Minerals, DK Publishing, Inc., New York City, 1995
  • Jack Odgen, Jewellery of the Ancient World, Rizzoli International Publications Inc., New York City, 1982

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