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Enstatite
Current inventory:  0 gems
 

Enstatite

  
Enstatite is named from the Greek word enstates
meaning an opponent because of its high melting point.

Discovered in 1855; IMA status: Valid (pre-IMA; Grandfathered)

 

Chemistry

 

 

Chemical Formula:

Mg2Si2O6

 

Magnesium Silicate

Molecular Weight:

200.78 gm

Composition:

Magnesium

24.21 %

Mg

40.15 %

MgO

 

Silicon

27.98 %

Si

59.85 %

SiO2

 

Oxygen

47.81 %

O

 

 

 

 

100.00 %

 

100.00 %

= TOTAL OXIDE

 

 

Classification

   

   

Mineral Classification:

Silicates (Germanates)

Strunz 8th Ed. ID:

8/F.02-10

Nickel-Strunz 10th Ed. ID:

9.AD.05

 

9 : SILICATES (Germanates)
D : Inosilicates
A : Inosilicates with 2-periodic single chains, Si
2O6; pyroxene family
05 : Enstatite Group; Enstatite-Ferrosilite Series

Related to:

Pyroxene Group. Orthopyroxene Subgroup. Enstatite-Ferrosilite Series. Dimorphous with Clinoenstatite.

Members of Group:

Pyroxene Group: Canaanite, Clinopyroxene Subgroup, Orthopyroxene Subgroup

Members of Subgroup:

Orthopyroxene Subgroup: Donpeacorite, Enstatite, Ferrosilite

Varieties:

Bronzite, Chromian-Enstatite, Lime-Bronzite, Vanadinbronzite

Synonyms:

Amblystegite, Chladnite, Enstadite, Ficinite, O-enstatite, Orthobronzite, Orthoenstatite, Paulite, Peckhamite, Protobastite, Shepardite, Shepardite (of Rose), Victorite

 

 

Crystal Data

   

   

Crystallography:

Orthorhombic - Dipyramidal

Crystal Habit:

Crystals prismatic, to 40 cm; commonly lamellar, fibrous, or massive.

Twinning:

Simple and lamellar twinning on {100}

 

 

Physical Properties

   

 

Cleavage:

Good on {210}, (210) ^ (210) ~88°; partings on {100} and {010}

Fracture:

Irregular/Uneven

Tenacity:

Brittle

Moh's Hardness:

5.0 - 6.0

Density:

3.20 - 3.90 (g/cm3)

Luminescence:

Not Fluorescent

Radioactivity:

Not Radioactive

 

 

Optical Properties

   

   

Color:

White, grayish, yellowish, greenish, olive-green, brown; colorless in thin section

Transparency:

Transparent to Opaque

Luster:

Vitreous, pearly on cleavages

Refractive Index:

1.650 - 1.679  Biaxial ( + ) 

Birefringence:

0.009 - 0.011

Dispersion:

Weak to moderate; r < v

Pleochroism:

None

 

 

Occurances

   

   

Geological Setting:

In pyroxenites, peridotites, and dunites; in ultramafic inclusions in alkalic olivine basalts and kimberlite; in mafic volcanics, rarely in felsic volcanics. Characteristic of charnockites and the granulite metamorphic facies, in regionally metamorphosed rocks and metagabbros. Common in chondrite, achondrite, and stony-iron meteorites.

Common Associations:

Olivine, Phlogopite, Clinopyroxene, Diopside, Spinel, Pyrope

Common Impurities:

Fe, Ca, Al, Co, Ni, Mn, Ti, Cr, Na, K

Type Locality:

Unknown

Year Discovered:

1855

View mineral photos:

Enstatite Mineral Photos and Locations

 

 

More Information

   

   

 

Mindat.org
Webmineral.com

 

 


Enstatite is a member of the Orthopyroxene Group that also includes Bronzite and
Hypersthene. It is found as colorless, gray, green, yellow and brown crystals. Enstatite is closely related to Bronzite which has slightly more iron content than Enstatite and is, as the name implies, a beautiful bronze color and has sub-adamantine luster. A very dark green to black Enstatite cat's eye is also available and a chrome green Chromian-Enstatite is rarely found.

Enstatite is found in many locations worldwide but only a few produce gem quality crystals. Two of the best known locations are Embilipituya, Sri Lanka and Mbeya, Tanzania. Enstatite is also commonly found in stony and iron meteorites.

Distribution: Prominent localities for well-studied material include: from ˇ Zdár (Zdjarberg), Czech Republic. At Řdegĺrden and Kjörrestad, Bamble, Norway. From The Lizard, Cornwall, England. At Dawros, County Connaught, Ireland. From Kupferberg, Bavaria, and the Bellerberg volcano, two km north of Mayen, Eifel district, Germany. At Kraubath, Styria, Austria. Fine crystals from Mbeya, Tanzania. At Liahobong, Lesotho. In the USA, at Webster, Jackson County, and on Corundum Hill, Macon County, North Carolina; at Wood's chrome mine and Texas, Lancaster County, and elsewhere in Pennsylvania. Gem material from Embilipituya, Sri Lanka.
 

  
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