Clinoferrosilite Mineral Data

Clinoferrosilite Mineral Data

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General Clinoferrosilite Information

Chemical Formula:

(Fe++,Mg)2Si2O6

Composition:

Molecular Weight = 248.09 gm

Magnesium 4.90 % Mg 8.12 % MgO

Iron 33.77 % Fe 43.44 % FeO

Silicon 22.64 % Si 48.44 % SiO₂

Oxygen 38.69 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Fe²⁺_1.5Mg_0.5Si₂O₆

IMA Status:

Valid Species (Pre-IMA) 1935

Locality:

Link to MinDat.org Location Data.

Synonym:

Clinohypersthene

ICSD 30675

PDF 17-548

Clinoferrosilite Image

Images:

Clinoferrosilite

Comments: Light green crystalline clinoferrosilite with dark green diopside.
Location: Bushveld Complex, Merensky Reef, Rustenberg, Northern Province, South Africa. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Clinoferrosilite Crystallography

Axial Ratios:

a:b:c =1.0347:1:0.5591

Cell Dimensions:

a = 9.53, b = 9.21, c = 5.15, Z = 4; beta = 107.633° V = 430.78 Den(Calc)= 3.83

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): 3.03(1), 3.23(0.8), 3.35(0.8),

Crystal Structure:

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Sueno S , Kimata M , Prewitt C T , American Mineralogist , 69 (1984) p.264-269, The crystal structure of high clinoferrosilicate, T = 1050 C

View Additional jPOWD Structure files for Clinoferrosilite
[1] [2] [3]

Physical Properties of Clinoferrosilite

Cleavage:

[110] Distinct

Color:

Brown, Colorless, Green.

Density:

4.068

Diaphaniety:

Transparent

Fracture:

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

Hardness:

5-6 - Between Apatite and Orthoclase

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Clinoferrosilite

Gladstone-Dale:

CI meas= 0.042 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= -0.018 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2022,KPDmeas= 0.1903,KC= 0.1987

Optical Data:

Biaxial (+), a=1.764, b=1.767, g=1.792, bire=0.0280, 2V(Calc)=40, 2V(Meas)=25.

Calculated Properties of Clinoferrosilite

Electron Density:

r_electron=3.74 gm/cc
note: r_{Clinoferrosilite}=3.83 gm/cc.

Fermion Index

Fermion Index = 0.02281
Boson Index = 0.97719

Photoelectric:

PE_{Clinoferrosilite}= 11.05 barns/electron
U=PE_{Clinoferrosilite} x r_electron= 41.28 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Clinoferrosilite is Not Radioactive

Clinoferrosilite Classification

Dana Class:

65.1.1.2 (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.01-20 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 Clinoferrosilite Information

References:

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

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Print or Cut-and-Paste your Clinoferrosilite Specimen Label here :

Clinoferrosilite

(Fe++,Mg)2Si2O6
Dana No: 65.1.1.2 Strunz No: VIII/F.01-20
Locality:

Notes: