Esseneite Mineral Data

Esseneite Mineral Data +

General Esseneite Information

Chemical Formula:

CaFe+++AlSiO6

Composition:

Molecular Weight = 246.99 gm

Calcium 16.23 % Ca 22.70 % CaO

Aluminum 10.92 % Al 20.64 % Al₂O₃

Iron 22.61 % Fe 32.33 % Fe₂O₃

Silicon 11.37 % Si 24.33 % SiO₂

Oxygen 38.87 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

CaFe³⁺AlSiO₆

IMA Status:

Approved IMA 1987

Locality:

Link to MinDat.org Location Data.

Synonym:

ICSD 202160

PDF 31-305

Esseneite Image

Images:

Esseneite

Comments: Orange-brown crystalline coating of esseneite on anorthite.
Location: Kopeisk, Chelyabinsk District, Southern Urals, Russia. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Esseneite Crystallography

Axial Ratios:

a:b:c =1.1097:1:0.6087

Cell Dimensions:

a = 9.79, b = 8.822, c = 5.37, Z = 4; beta = 105.81° V = 446.25 Den(Calc)= 3.68

Crystal System:

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

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

By Intensity(I/I_o): 3(1), 2.526(0.7), 2.96(0.6),

Crystal Structure:

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Cosca M A , Peacor D R , American Mineralogist , 72 (1987) p.148-156, Chemistry and structure of esseneite (CaFeAlSiO6), a new pyroxene, produced by pyrometamorphism

Physical Properties of Esseneite

Cleavage:

[110] Perfect

Color:

Reddish brown.

Density:

3.54

Diaphaniety:

Transparent

Hardness:

6 - Orthoclase

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Esseneite

Gladstone-Dale:

CI meas= 0.056 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= 0.092 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2206,KPDmeas= 0.2293,KC= 0.2428

Optical Data:

Biaxial (-), a=1.795, b=1.815, g=1.825, bire=0.0300, 2V(Calc)=68, 2V(Meas)=77.

Calculated Properties of Esseneite

Electron Density:

r_electron=3.47 gm/cc
note: r_Esseneite=3.54 gm/cc.

Fermion Index

Fermion Index = 0.0105
Boson Index = 0.9895

Photoelectric:

PE_Esseneite= 9.50 barns/electron
U=PE_Esseneite x r_electron= 32.96 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Esseneite is Not Radioactive

Esseneite Classification

Dana Class:

65.1.3a.6 (65)Inosilicate Single-Width Unbranched Chains, W=1

(65.1)with chains P=2

(65.1.3a)C2/c clinopyroxenes (Ca clinopyroxenes)

65.1.3a.1 Diopside CaMgSi2O6 C 2/c 2/m

65.1.3a.2 Hedenbergite CaFeSi2O6 C 2/c 2/m

65.1.3a.3 Augite (Ca,Na)(Mg,Fe,Al,Ti)(Si,Al)2O6 C 2/c 2/m

65.1.3a.4 Johannsenite CaMnSi2O6 C 2/c 2/m

65.1.3a.5 Petedunnite Ca(Zn,Mn,Fe,Mg)Si2O6 C 2/c 2/m

65.1.3a.6 Esseneite CaFeAlSiO6 C 2/c 2/m

Strunz Class:

VIII/F.01-110 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 Esseneite Information

References:

PHYS. PROP.(Am.Min.,Vol.72,p148-156,1987) OPTIC PROP.(Am.Min.,Vol.72,p148-156,1987)

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Esseneite

CaFe+++AlSiO6
Dana No: 65.1.3a.6 Strunz No: VIII/F.01-110
Locality:

Notes: