Sardonyx

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MFA Acc. #: 99.101

Contents

Description

A type of onyx, which is an agate with parallel bands. Sardonyx has layers of brownish sard (red carnelian) alternating with lighter-color layers of onyx. Often used as a gemstone, it has been mined or gathered since before 2200 BCE.

Synonyms and Related Terms

onyx; quartz; agate; chalcedony

01.7285-SC25486.jpg

Other Properties

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

Mohs Hardness 7.0
Density 2.6

Additional Information

Mineralogy Database: Quartz

Comparisons

Properties of Common Gemstones


Authority

  • Jack Odgen, Jewellery of the Ancient World, Rizzoli International Publications Inc., New York City, 1982
  • Van Nostrand's Scientific Encyclopedia, Douglas M. Considine (ed.), Van Nostrand Reinhold, New York, 1976
  • 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

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