Mineralogy Database

Enstatite Mineral Data

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General Enstatite Information

Help on Chemical  Formula: Chemical Formula: Mg2Si2O6
Help on Composition: Composition: Molecular Weight = 200.78 gm
   Magnesium  24.21 %  Mg   40.15 % MgO
   Silicon    27.98 %  Si   59.85 % SiO2
   Oxygen     47.81 %  O
             ______        ______ 
             100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Mg2Si2O6
Help on Environment: Environment: Magmatic mafic rocks.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1855
Help on Locality: Locality: Common worldwide. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: From the Greek enstates - "opponent."
Help on Name Pronunciation: Name Pronunciation: Enstatite + Pronunciation Say ENSTATITE
Help on Synonym: Synonym: Bronzite - bronze brown
  ICSD 37313
  PDF 19-768

Enstatite Image

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Comments: Single, terminated, brown, transparent to translucent enstatite crystal.
Location: Mpwa-Mpwa, Tanzania. Scale: 17x17x27 mm.
© Dan Weinrich

Enstatite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =2.0701:1:0.5888
Help on Cell Dimensions: Cell Dimensions: a = 18.228, b = 8.805, c = 5.185, Z = 8; V = 832.18 Den(Calc)= 3.20
Help on Crystal System: Crystal System: Orthorhombic - Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: P bca
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.167(1), 2.872(0.85), 2.494(0.5),

Physical Properties of Enstatite

Help on Cleavage: Cleavage: {110} Distinct, {010} Distinct
Help on Color: Color: White, Yellowish green, Brown, Greenish white, Gray.
Help on Density: Density: 3.1 - 3.3, Average = 3.2
Help on Diaphaneity: Diaphaneity: Translucent to opaque
Help on Fracture: Fracture: Brittle - Generally displayed by glasses and most non-metallic minerals.
Help on Habit: Habit: Lamellar - Thin laminae producing a lamellar structure.
Help on Habit: Habit: Massive - Fibrous - Distinctly fibrous fine-grained forms.
Help on Hardness: Hardness: 5.5 - Knife Blade
Help on Luminescence: Luminescence: Non-fluorescent.
Help on Luster: Luster: Vitreous - Pearly
Help on Streak: Streak: gray

Optical Properties of Enstatite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.012 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= -0.012 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2073,KPDmeas= 0.2073,KC= 0.2048
Ncalc = 1.63 - 1.68
Help on Optical Data: Optical Data: Biaxial (+), a=1.65-1.668, b=1.652-1.673, g=1.659-1.679, bire=0.0090-0.0110, 2V(Calc)=58-86, 2V(Meas)=54-90. Dispersion weak, r < v.

Calculated Properties of Enstatite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.19 gm/cc
note: Specific Gravity of Enstatite =3.20 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.03
Boson Index = 0.97
Help on Photoelectric: Photoelectric: PEEnstatite = 1.61 barns/electron
U=PEEnstatite x rElectron Density= 5.13 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Enstatite is Not Radioactive

Enstatite Classification

Help on  Dana Class: Dana Class: (65)Inosilicate Single-Width Unbranched Chains, W=1
  (65.01)with chains P=2
  (65.01.02)Orthopyroxenes Enstatite Mg2Si2O6 P bca 2/m 2/m 2/m Ferrosilite (Fe,Mg)2Si2O6 P bca 2/m 2/m 2/m Donpeacorite (Mn,Mg)MgSi2O6 P bca 2/m 2/m 2/m
Help on  Strunz Class: Strunz Class: 09.DA.05 09 - SILICATES (Germanates)
  09.D - Inosilicates* Structural terminology according to Liebau (1985)
  09.DA -Inosilicates with 2-periodic single chains, Si2O6; pyroxene family
09.DA.05 Donpeacorite (Mn,Mg)MgSi2O6 P bca 2/m 2/m 2/m
09.DA.05 Akimotoite! (Mg,Fe)SiO3 R 3 3
09.DA.05 Enstatite Mg2Si2O6 P bca 2/m 2/m 2/m
09.DA.05 Ferrosilite (Fe,Mg)2Si2O6 P bca 2/m 2/m 2/m

Other Enstatite Information

Help on References: References: NAME( Duda&Rejl90) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Heinrich65)
Help on See Also: See Also: Links to other databases for Enstatite :
1 - Alkali-Nuts(English)
2 - Alkali-Nuts(Francais)
3 - Am. Min. Crystal Structure Database
4 - Amethyst Galleries' Mineral Gallery
5 - Athena
6 - EUROmin Project
7 - Ecole des Mines de Paris
8 - GeoScienceWorld
9 - Google Images
10 - Google Scholar
11 - Handbook of Mineralogy (MinSocAm)
12 - Handbook of Mineralogy (UofA)
13 - HyperPhysics
14 - MinDAT
15 - Mineral and Gemstone Kingdom
16 - Mineralienatlas (Deutsch)
17 - Online Mineral Museum
18 - QUT Mineral Atlas
19 - Ruff.Info
20 - Scandinavian mineral gallery
21 - Tradeshop.com - The Rainbow of Gems
22 - UCLA - Petrography Thin-Sections

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Dana No: Strunz No: 09.DA.05





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