Clinoenstatite Mineral Data

Clinoenstatite Mineral Data

General Clinoenstatite Information

Chemical Formula:

Mg2Si2O6

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

Empirical Formula:

Mg₂Si₂O₆

IMA Status:

Valid Species (Pre-IMA) 1906

Locality:

Link to MinDat.org Location Data.

Name Origin:

Named as the monoclinic polymorph of enstatite.

Synonym:

Clinohypersthene

ICSD 71835

PDF 35-610

Clinoenstatite Image

Images:

Clinoenstatite

Comments: Crystalline massive clinoenstatite.
Location: Cape Vogel, Papua New Guinea. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Clinoenstatite Crystallography

Axial Ratios:

a:b:c =1.0898:1:0.5863

Cell Dimensions:

a = 9.6065, b = 8.8146, c = 5.1688, Z = 4; beta = 108.335° V = 415.46 Den(Calc)= 3.21

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: P 2₁/c

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 2.88(1), 2.98(0.95), 3.17(0.6),

Crystal Structure:

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Tribaudino M , Nestola F , Camara F , Domeneghetti M C , American Mineralogist , 87 (2002) p.648-657

View Additional jPOWD Structure files for Clinoenstatite
[1] [2] [3] [4] [5] [6] [7] [8]

Physical Properties of Clinoenstatite

Cleavage:

[???] Perfect, [???] Indistinct

Color:

Colorless, Green, Greenish yellow, Yellow brown.

Density:

3.2 - 3.6, Average = 3.4

Diaphaniety:

Transparent to translucent to opaque

Fracture:

Brittle - Generally displayed by glasses and most non-metallic minerals.

Habit:

Columnar - Forms columns

Habit:

Crystalline - Fine - Occurs as well-formed fine sized crystals.

Habit:

Granular - Generally occurs as anhedral to subhedral crystals in matrix.

Hardness:

5-6 - Between Apatite and Orthoclase

Luminescence:

Non-fluorescent.

Luster:

Vitreous - Pearly

Streak:

greenish gray

Optical Properties of Clinoenstatite

Gladstone-Dale:

CI meas= 0.059 (Fair) - where the CI = (1-KPDmeas/KC)
CI calc= 0.004 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.204,KPDmeas= 0.1926,KC= 0.2048

Optical Data:

Biaxial (+), a=1.651, b=1.654, g=1.66, bire=0.0090

Calculated Properties of Clinoenstatite

Electron Density:

r_electron=3.20 gm/cc
note: r_{Clinoenstatite}=3.21 gm/cc.

Fermion Index

Fermion Index = 0.0375
Boson Index = 0.9625

Photoelectric:

PE_{Clinoenstatite}= 1.61 barns/electron
U=PE_{Clinoenstatite} x r_electron= 5.15 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Clinoenstatite is Not Radioactive

Clinoenstatite Classification

Dana Class:

65.1.1.1 (65)Inosilicate Single-Width Unbranched Chains, W=1

(65.1)with chains P=2

(65.1.1)P2/c clinopyroxenes

65.1.1.1 Clinoenstatite Mg2Si2O6 P 2₁/c 2/m

65.1.1.2 Clinoferrosilite (Fe,Mg)2Si2O6 P 2₁/c 2/m

65.1.1.3 Kanoite (Mn,Mg)2Si2O6 P 2₁/c 2/m

65.1.1.4 Pigeonite (Mg,Fe,Ca)(Mg,Fe)Si2O6 P 2₁/c 2/m

Strunz Class:

VIII/F.01-10 VIII - Silicates

VIII/F - Inosilicates (chain and band) double chains [Si2O6]4-

VIII/F.01 - Pyroxene group, Clinopyroxene

VIII/F.01-10 Clinoenstatite Mg2Si2O6 P 2₁/c 2/m

VIII/F.01-20 Clinoferrosilite (Fe,Mg)2Si2O6 P 2₁/c 2/m

VIII/F.01-30 Kanoite (Mn,Mg)2Si2O6 P 2₁/c 2/m

VIII/F.01-40 Pigeonite (Mg,Fe,Ca)(Mg,Fe)Si2O6 P 2₁/c 2/m

VIII/F.01-50 Diopside CaMgSi2O6 C 2/c 2/m

VIII/F.01-60 Hedenbergite CaFeSi2O6 C 2/c 2/m

VIII/F.01-70 Johannsenite CaMnSi2O6 C 2/c 2/m

VIII/F.01-80 Petedunnite Ca(Zn,Mn,Fe,Mg)Si2O6 C 2/c 2/m

VIII/F.01-90 Augite (Ca,Na)(Mg,Fe,Al,Ti)(Si,Al)2O6 C 2/c 2/m

VIII/F.01-100 Omphacite (Ca,Na)(Mg,Fe,Al)Si2O6 P 2/n 2/m

VIII/F.01-110 Esseneite CaFeAlSiO6 C 2/c 2/m

VIII/F.01-120 Spodumene LiAlSi2O6 C 2/c 2/m

VIII/F.01-130 Jadeite Na(Al,Fe)Si2O6 C 2/c 2/m

VIII/F.01-140 Aegirine NaFeSi2O6 C 2/c 2/m

VIII/F.01-145 Namansilite NaMn(Si2O6) C 2/c 2/m

VIII/F.01-150 Jervisite (Na,Ca,Fe)(Sc,Mg,Fe)Si2O6 C 2/c 2/m

VIII/F.01-160 Natalyite Na(V,Cr)Si2O6 C 2/c 2/m

VIII/F.01-170 Kosmochlor NaCrSi2O6 C 2/c 2/m

Other Clinoenstatite Information

References:

NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

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Clinoenstatite

Mg2Si2O6
Dana No: 65.1.1.1 Strunz No: VIII/F.01-10
Locality:

Notes: