Difference between revisions of "Enstatite"
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A pyroxene mineral composed of magnesium silicate. Enstatite was first described by G.A. Kenngott in 1855. It occurs naturally in metamorphic rocks and meterorites. The mineral is usually a gray, pale green, or brown in color although a gemstone quality emerald green variety occurs rarely. Weathered enstatite can have a metallic luster and is called bronzite. Enstatite can alter to form [[steatite]]. Steatite may also be heated to form enstatite. | A pyroxene mineral composed of magnesium silicate. Enstatite was first described by G.A. Kenngott in 1855. It occurs naturally in metamorphic rocks and meterorites. The mineral is usually a gray, pale green, or brown in color although a gemstone quality emerald green variety occurs rarely. Weathered enstatite can have a metallic luster and is called bronzite. Enstatite can alter to form [[steatite]]. Steatite may also be heated to form enstatite. | ||
| − | + | [[[SliderGallery rightalign|Enstatite.TIF~FTIR (MFA)|Enstatite IR-ATR RRUFF R050644.png~IR-ATR (RRUFF)|Enstatite Raman RRUFF R050644.png~Raman (RRUFF)|enstatiteRS.jpg~Raman (RASMIN)]]] | |
== Synonyms and Related Terms == | == Synonyms and Related Terms == | ||
bronzite; Enstatit (Deut.); enstatiet (Ned.) | bronzite; Enstatit (Deut.); enstatiet (Ned.) | ||
| − | + | ==Physical and Chemical Properties== | |
| − | + | * Orthorhombic crystal system with prismatic crystals commonly lamellar, fibrous or massive | |
| − | == | + | * Cleavage = distinct in two directions |
| − | + | * Fracture = uneven | |
| − | Orthorhombic crystal system | + | * Luster = vitreous to pearly |
| + | * Streak = gray | ||
| + | * Fluorescence = inert | ||
| + | * Pleochroism = weak to strong; pink to green; green to yellowish green; or brown to yellow | ||
{| class="wikitable" | {| class="wikitable" | ||
| Line 20: | Line 23: | ||
|- | |- | ||
! scope="row"| Mohs Hardness | ! scope="row"| Mohs Hardness | ||
| − | | 5-6 | + | | 5 - 6 |
|- | |- | ||
! scope="row"| Density | ! scope="row"| Density | ||
| − | | 3.21-3.96 | + | | 3.21-3.96 g/ml |
|- | |- | ||
! scope="row"| Refractive Index | ! scope="row"| Refractive Index | ||
| − | | 1.650-1. | + | | 1.650-1.679 |
| + | |- | ||
| + | ! scope="row"| Birefringence | ||
| + | | 0.008 - 0.11 | ||
|} | |} | ||
| − | == | + | ==Resources and Citations== |
| − | + | * Gem Identification Lab Manual, Gemological Institute of America, 2016. | |
| − | * | + | * Wikipedia: [https://en.wikipedia.org/wiki/Enstatite Enstatite] (Accessed Nov. 2, 2005 and Dec 2022) |
| − | + | * Minerals.net: [https://www.minerals.net/mineral/enstatite.aspx Enstatite] | |
[[Category:Materials database]] | [[Category:Materials database]] | ||
Latest revision as of 14:03, 23 December 2022
Description
A pyroxene mineral composed of magnesium silicate. Enstatite was first described by G.A. Kenngott in 1855. It occurs naturally in metamorphic rocks and meterorites. The mineral is usually a gray, pale green, or brown in color although a gemstone quality emerald green variety occurs rarely. Weathered enstatite can have a metallic luster and is called bronzite. Enstatite can alter to form Steatite. Steatite may also be heated to form enstatite.
Synonyms and Related Terms
bronzite; Enstatit (Deut.); enstatiet (Ned.)
Physical and Chemical Properties
- Orthorhombic crystal system with prismatic crystals commonly lamellar, fibrous or massive
- Cleavage = distinct in two directions
- Fracture = uneven
- Luster = vitreous to pearly
- Streak = gray
- Fluorescence = inert
- Pleochroism = weak to strong; pink to green; green to yellowish green; or brown to yellow
| Composition | MgSiO3 |
|---|---|
| Mohs Hardness | 5 - 6 |
| Density | 3.21-3.96 g/ml |
| Refractive Index | 1.650-1.679 |
| Birefringence | 0.008 - 0.11 |
Resources and Citations
- Gem Identification Lab Manual, Gemological Institute of America, 2016.
- Wikipedia: Enstatite (Accessed Nov. 2, 2005 and Dec 2022)
- Minerals.net: Enstatite