Difference between revisions of "Sphene"
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[[File:sphene_corrected2.jpg|thumb|Sphene chrystals]] | [[File:sphene_corrected2.jpg|thumb|Sphene chrystals]] | ||
| − | == | + | == Physical and Chemical Properties == |
| − | Monoclinic system, often forming wedge-shaped, twinned crystals; sometimes compact, massive. Distinct cleavage in parallel planes. Luster = adamantine to resinous. Fracture = conchoidal. Streak = white | + | * Monoclinic system, often forming wedge-shaped, twinned crystals; sometimes compact, massive. |
| + | * Distinct cleavage in parallel planes. | ||
| + | * Luster = adamantine to resinous. | ||
| + | * Fracture = conchoidal. | ||
| + | * Streak = white | ||
{| class="wikitable" | {| class="wikitable" | ||
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|- | |- | ||
! scope="row"| Density | ! scope="row"| Density | ||
| − | | 3.4-3.6 | + | | 3.4-3.6 g/ml |
|- | |- | ||
! scope="row"| Refractive Index | ! scope="row"| Refractive Index | ||
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|} | |} | ||
| − | == | + | ==Resources and Citations== |
| − | Mineralogy Database: [http://www.webmineral.com/data/Titanite.shtml Titanite] | + | * Mineralogy Database: [http://www.webmineral.com/data/Titanite.shtml Titanite] |
[[Category:Materials database]] | [[Category:Materials database]] | ||
Revision as of 17:01, 2 June 2022
Description
Small yellow, green or brown crystals occasionally used as gemstones. Sphene is composed of calcium titanium silicate. It is often found associated with granite. Sphene has good luster and fire but is too soft for general wear. Gem quality sphene crystals come from the Austrian and Swiss Alps, Myanmar, Canada (Ontario) and the U.S. (California, New York, Montana).
Synonyms and Related Terms
titanite; esfena, titanita (Esp.); esfena (Port.); Sphen, Titanit (Deut.); sfeen (Ned.)
Physical and Chemical Properties
- Monoclinic system, often forming wedge-shaped, twinned crystals; sometimes compact, massive.
- Distinct cleavage in parallel planes.
- Luster = adamantine to resinous.
- Fracture = conchoidal.
- Streak = white
| Composition | CaTiSiO5 |
|---|---|
| Mohs Hardness | 5.0 - 5.5 |
| Density | 3.4-3.6 g/ml |
| Refractive Index | 1.84 - 2.11 |
Resources and Citations
- Mineralogy Database: Titanite