Difference between revisions of "Quartz"

Jump to: navigation, search
Line 62: Line 62:
[[media:download_file_222.pdf|Properties of Common Abrasives]]
[[media:download_file_222.pdf|Properties of Common Abrasives]]
[[media:|Properties of Common Gemstones]]
[[media:download_file_414.pdf|Properties of Common Gemstones]]
[[media:download_file_431.pdf|Natural and Simulated Diamonds]]
[[media:download_file_431.pdf|Natural and Simulated Diamonds]]
[[media:download_file_535.pdf|Characteristics of Common White Pigments]]
[[media:download_file_535.pdf|Characteristics of Common White Pigments]]
== Additional Images ==
== Additional Images ==

Revision as of 10:30, 8 June 2018



A hard, crystalline form of silicon dioxide. Quartz is one of the most common minerals in the earth's crust and occurs as grains (Sand), masses (Agate, Bloodstone, Chalcedony, Jasper, Carnelian, etc.) or crystals (Rock crystal, Amethyst, Citrine, Smoky quartz, Rose quartz, etc.). Quartz usually crystallizes in hexagonal prisms or pyramids. It has been mined or gathered as a semiprecious stone since Paleolithic times. Quartz is a piezoelectric crystal, i.e. generates an electrical force when placed under pressure. Additionally, quartz crystals are used in polarized light microscopy because they can rotate the plane of polarized light. Some crystalline forms of quartz are used as gemstones, such as amethyst and citrine. Sand is the primary component in the manufacture of glass, and is an additive in porcelain, brick, cement, and mortar. Because of its hardness, quartz is also used as an abrasive in stonecutting, sandblasting, and glass grinding.


Synonyms and Related Terms

sand; agate; bloodstone; chalcedony; jasper; carnelian; sard; rock crystal (colorless); amethyst (purple); citrine (yellow); onyx; rose quartz (pink); smoky quartz (brown to black); yellow quartz; milky quartz (milk white); chrysoprase; kvarts (Dan., Nor., Sven.); Quarz (Deut.); cuarzo (Esp.); quartz (Fr.); quarzo (It.); kwarts (Ned.); kwarc (Pol.); quartzo (Port.)

Raman Quartz

Quartz MFA Raman.jpg

Raman Quartz Chalcedony

Quartz-Chalcedony overlay.jpg


MFA- Quartz.jpg



Other Properties

Insoluble in acids except for hydrofluoric acid. Slightly soluble in alkalis.

Trigonal crystal system. Low birefringence. Low thermal expansion.

Fracture = conchoidal. Luster = vitreous to greasy. Streak = white.

Microscopically, particles are transparent. Crossed polars shows low virefringence and first order grays

Composition SiO2
CAS 14808-60-7
Mohs Hardness 7.0
Melting Point 1713
Density 2.65-2.66
Molecular Weight mol. wt. = 60.08
Refractive Index 1.544; 1.553
Boiling Point 2230

Hazards and Safety

Noncombustible. Inhalation of fine particles may cause silicosis.

Mallinckrodt Baker: MSDS

Additional Information

Mineralogy Database: Quartz


Properties of Common Abrasives

Properties of Common Gemstones

Natural and Simulated Diamonds

Characteristics of Common White Pigments

Additional Images

Sources Checked for Data in Record

  • Nicholas Eastaugh, Valentine Walsh, Tracey Chaplin, Ruth Siddall, Pigment Compendium, Elsevier Butterworth-Heinemann, Oxford, 2004
  • R. J. Gettens, G.L. Stout, Painting Materials, A Short Encyclopaedia, Dover Publications, New York, 1966
  • G.S.Brady, Materials Handbook, McGraw-Hill Book Co., New York, 1971 Comment: p. 644
  • Ralph Mayer, A Dictionary of Art Terms and Techniques, Harper and Row Publishers, New York, 1969 (also 1945 printing)
  • Richard S. Lewis, Hawley's Condensed Chemical Dictionary, Van Nostrand Reinhold, New York, 10th ed., 1993
  • R.M.Organ, Design for Scientific Conservation of Antiquities, Smithsonian Institution, Washington DC, 1968
  • Jack Odgen, Jewellery of the Ancient World, Rizzoli International Publications Inc., New York City, 1982
  • Dictionary of Building Preservation, Ward Bucher, ed., John Wiley & Sons, Inc., New York City, 1996
  • Van Nostrand's Scientific Encyclopedia, Douglas M. Considine (ed.), Van Nostrand Reinhold, New York, 1976
  • Random House, Webster's Encyclopedic Unabridged Dictionary of the English Language, Grammercy Book, New York, 1997
  • R.F.Symmes, T.T.Harding, Paul Taylor, Rocks, Fossils and Gems, DK Publishing, Inc., New York City, 1997
  • A.Lucas, J.R.Harris, Ancient Egyptian Materials and Industries, Edward Arnold Publishers Ltd., London, 4th edition, 1962
  • The American Heritage Dictionary or Encarta, via Microsoft Bookshelf 98, Microsoft Corp., 1998
  • C.W.Chesterman, K.E.Lowe, Audubon Society Field Guide to North American Rocks and Minerals, Alfred A. Knopf, New York, 1979

Retrieved from "http://cameo.mfa.org/index.php?title=Quartz&oldid=62022"