Difference between revisions of "Garnet"

Jump to: navigation, search
(Other Properties)
Line 66: Line 66:
[[[SliderGallery rightalign|garnetgrossRS.jpg~Raman|Garnets types.jpg~Raman 5 types]]]
[[[SliderGallery rightalign|Garnets types.jpg~Raman 5 types|Demantoid Raman.jpg~Andradite]]]
== Additional Information ==
== Additional Information ==

Revision as of 10:12, 8 June 2018



A family of minerals composed of trisilicates with Aluminum, Iron, Calcium, Magnesium, Manganese, or Chromium. Garnets are found in deposits around the world as transparent crystals embedded in igneous and metamorphic rocks. They have been used as gemstones since antiquity. The ruby red Pyrope and the lighter red Almandine were the most highly prized varieties. The pale rose-purple Rhodolite is a mixture of pyrope and almandine. Garnets are also used as abrasives. The crushed, ground and cleaned garnet is sold as an abrasive powder, coated paper and coated cloth. Garnet particles have sharper cutting edges than aluminum oxide, but are expensive. To decrease costs, some commercially available garnet cloths are actually prepared with quartz. Sources of gem quality garnets include the Czech Republic, South Africa, Australia, China, India, Brazil, Sri Lanka, and the U.S (New York, Maine, Idaho).


Synonyms and Related Terms

pyrope (deep red to black); almandine (deep red to black); spessartine (red to brown); grossularite (green); grossular (colorless); carbuncle; andradite (wine red); uvarovite (emerald green); tsavorite (Green); rhodolite (pale red to purple); hessonite (golden); topazolite; demantoid; melanite; Uralian emeralds; Greek anthrax; Granat (Deut.); granate (Esp.); grenat (Fr.); granaat (Ned.); granada (Port.); granatus (Lat.)

Other Properties

Isometric crystal system with dodecahedron and trapezohedron habits.

Luster = vitreous to resinous. Fracture = conchoidal or uneven. Streak = colorless to white

Fluorescence = none (except green ones which may give weak yellow-orange colors)

Mineral Almandine Pyrope Spessartine Andradite Grossular Uvarovite Rhodolite
Composition Fe3Al2(SiO4)3 Mg33Al2(SiO4)3 Mn3Al2(SiO4)3 Ca3Fe2(SiO4)3 Ca3Al2(SiO4)3 Ca3Cr2(SiO4)3 pyrope + almandine
Specific gravity 4.2 3.56 4.18 3.90 3.57 3.85
Hardness 7.0 - 7.5 7.0 - 7.5 6.5 - 7.5 6.5 - 7.0 6.5 - 7.5 6.5 - 7.0
Colors red, brown red to purple orange to red to brown green, yellow, black green, yellow, red, pink, clear green

Raman 5 types

Garnets types.jpg


Demantoid Raman.jpg

Additional Information

J. Ogden, Jewelry of the Ancient World, Rizzoli International Publications, New York, 1982.


Properties of Common Abrasives

Properties of Common Gemstones

Natural and Simulated Diamonds

Additional Images

Sources Checked for Data in Record

  • Jack Odgen, Jewellery of the Ancient World, Rizzoli International Publications Inc., New York City, 1982
  • R.F.Symmes, T.T.Harding, Paul Taylor, Rocks, Fossils and Gems, DK Publishing, Inc., New York City, 1997
  • Encyclopedia Britannica, http://www.britannica.com Comment: "garnet" Encyclopædia Britannica [Accessed December 4, 2001]. (color photo)
  • C.W.Chesterman, K.E.Lowe, Audubon Society Field Guide to North American Rocks and Minerals, Alfred A. Knopf, New York, 1979
  • G.S.Brady, Materials Handbook, McGraw-Hill Book Co., New York, 1971 Comment: Mohs hardness = 8
  • Van Nostrand's Scientific Encyclopedia, Douglas M. Considine (ed.), Van Nostrand Reinhold, New York, 1976
  • CRC Handbook of Chemistry and Physics, Robert Weast (ed.), CRC Press, Boca Raton, Florida, v. 61, 1980 Comment: density=3.15-4.3
  • R.M.Organ, Design for Scientific Conservation of Antiquities, Smithsonian Institution, Washington DC, 1968
  • Michael McCann, Artist Beware, Watson-Guptill Publications, New York City, 1979

Retrieved from "http://cameo.mfa.org/index.php?title=Garnet&oldid=62013"