Esseneite Mineral Data

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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

Environment:

A high-temperature, low-pressure, oxidized and quenched crystallization product derived from fused sediments contiguous to naturally combusted coal seams.

IMA Status:

Approved IMA 1987

Locality:

At Durham ranch, in the Powder River basin, 13 km northeast of Reno Junction and 25 km south of Gillette, Campbell Co., Wyoming, USA. Link to MinDat.org Location Data.

Name Origin:

Named for Eric J. Essene, Professor at the University of Michigan, Ann Arbor, Michigan, USA, and discoverer of the first specimens.

Name Pronunciation:

Esseneite + Pronunciation

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

Diaphaneity:

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
Ncalc = 1.86 - 1.89

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:

Bulk Density (Electron Density)=3.47 gm/cc
note: Specific Gravity of Esseneite =3.54 gm/cc.

Fermion Index:

Fermion Index = 0.01
Boson Index = 0.99

Photoelectric:

PE_Esseneite= 9.50 barns/electron
U=PE_Esseneite x rElectron Density= 32.96 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Esseneite is Not Radioactive

Esseneite Classification

Dana Class:

65.01.03a.06 (65)Inosilicate Single-Width Unbranched Chains, W=1

(65.01)with chains P=2

(65.01.03a)C2/c clinopyroxenes (Ca clinopyroxenes)

65.01.03a.01 Diopside CaMgSi2O6 C 2/c 2/m

65.01.03a.02 Hedenbergite CaFeSi2O6 C 2/c 2/m

65.01.03a.03 Augite (Ca,Na)(Mg,Fe,Al,Ti)(Si,Al)2O6 C 2/c 2/m

65.01.03a.04 Johannsenite CaMnSi2O6 C 2/c 2/m

65.01.03a.05 Petedunnite Ca(Zn,Mn,Fe,Mg)Si2O6 C 2/c 2/m

65.01.03a.06 Esseneite CaFeAlSiO6 C 2/c 2/m

65.01.03a.07 Davisite! Ca(Sc,Ti,Mg,Ti)AlSiO6 C 2/c 2/m

Strunz Class:

09.DA.15 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.15 Augite (Ca,Na)(Mg,Fe,Al,Ti)(Si,Al)2O6 C 2/c 2/m

09.DA.15 Esseneite CaFeAlSiO6 C 2/c 2/m

09.DA.15 Diopside CaMgSi2O6 C 2/c 2/m

09.DA.15 Johannsenite CaMnSi2O6 C 2/c 2/m

09.DA.15 Hedenbergite CaFeSi2O6 C 2/c 2/m

09.DA.15 Petedunnite Ca(Zn,Mn,Fe,Mg)Si2O6 C 2/c 2/m

09.DA.15 Davisite! Ca(Sc,Ti,Mg,Ti)AlSiO6 C 2/c 2/m

Other Esseneite Information

References:

NAME( AntBidBlaNic2) PHYS. PROP.(Am.Min.,Vol.72,p148-156,1987) OPTIC PROP.(Am.Min.,Vol.72,p148-156,1987)

See Also:

Links to other databases for Esseneite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info
15 - WWW-MINCRYST

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

Esseneite

CaFe+++AlSiO6
Dana No: 65.01.03a.06 Strunz No: 09.DA.15
Locality:

Notes: