Titanite
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Description
Small yellow, gray, green or brown crystals occasionally used as gemstones. Titanite, or sphene, is composed of calcium titanium silicate and is often associated with Granite. Deposits have been found in Canada (Ontario), Mexico, Austria (Tirol), Italy (Trentino), Norway, Switzerland, Madagascar, and the U. S. (New York, Montana, California). Sphene has good luster and fire but is too soft for general wear.
Synonyms and Related Terms
sphene; Titanit (Deut.); Sphen (Deut.); titanita (Esp.); titanite (Fr.); tytanit (Pol.); titanite, esfena (Port.); titaniet (Ned.)
Physical and Chemical Properties
- Brittle, wedge-shaped monoclinic crystals
- Good cleavage in one direction
- Fracture = conchoidal
- Streak = white
- Luster = vitreous to adamantine
- Fluorescence = none
| Composition | CaTiSiO5 |
|---|---|
| Mohs Hardness | 5.0 - 5.5 |
| Density | 3.4-3.6 g/ml |
| Refractive Index | 1.885-1.990; 1.915-2.050 |
Comparisons
Natural and Simulated Diamonds
Resources and Citations
- Mineralogy Database: Titanite
- Encyclopedia Britannica, http://www.britannica.com Comment: "sphene" [Accessed December 4, 2001]
- C.W.Chesterman, K.E.Lowe, Audubon Society Field Guide to North American Rocks and Minerals, Alfred A. Knopf, New York, 1979
- Wikipedia: http://en.wikipedia.org/wiki/Titanite (Accessed Sept. 17, 2005)
- 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
- The American Heritage Dictionary or Encarta, via Microsoft Bookshelf 98, Microsoft Corp., 1998