Augite Mineral Data + 
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- 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
- 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
General Augite Information |
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 Chemical Formula: |
(Ca,Na)(Mg,Fe,Al,Ti)(Si,Al)2O6 | ||
| Composition: |
Molecular Weight = 236.35 gm | ||
| Sodium 0.97 % Na 1.31 % Na2O | |||
| Calcium 15.26 % Ca 21.35 % CaO | |||
| Magnesium 9.26 % Mg 15.35 % MgO | |||
| Titanium 2.03 % Ti 3.38 % TiO2 | |||
| Aluminum 4.57 % Al 8.63 % Al2O3 | |||
| Iron 4.73 % Fe 6.08 % FeO | |||
| Silicon 22.58 % Si 48.30 % SiO2 | |||
| Oxygen 40.62 % O | |||
| ______ ______ | |||
| 100.00 % 104.40 % = TOTAL OXIDE | |||
| Empirical Formula: |
Ca0.9Na0.1Mg0.9Fe2+0.2Al0.4Ti0.1Si1.9O6 | ||
| Environment: |
Basic igneous and metamorphic rocks. | ||
| IMA Status: |
Valid Species (Pre-IMA) 1792 | ||
| Locality: |
Common world wide. Link to MinDat.org Location Data. | ||
| Name Origin: |
From the Greek auge - "luster." | ||
| Synonym: |
Fassaite | ||
| ICSD 9257 | |||
| PDF 24-203 | |||
Augite Image | |||
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Augite Crystallography |
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| Axial Ratios: |
a:b:c =1.0888:1:0.5833 | ||
| Cell Dimensions: |
a = 9.8, b = 9, c = 5.25, Z = 4; beta = 105° V = 447.27 Den(Calc)= 3.51 | ||
| Crystal System: |
Monoclinic - PrismaticH-M Symbol (2/m) Space Group: C 2/c | ||
| X Ray Diffraction: |
By Intensity(I/Io): 1.43(1), 1.62(1), 2.99(1), | ||
| Forms:
Mouse |
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Crystal Structure:
Mouse |
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Physical Properties of Augite |
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| Cleavage: |
[110] Perfect, [010] Indistinct | ||
| Color: |
Brown green, Green, Light brown, Dark brown, Black. | ||
| Density: |
3.2 - 3.6, Average = 3.4 | ||
| Diaphaniety: |
Translucent to opaque | ||
| Fracture: |
Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments. | ||
| Habit: |
Columnar - Forms columns | ||
| Habit: |
Granular - Generally occurs as anhedral to subhedral crystals in matrix. | ||
| Habit: |
Massive - Fibrous - Distinctly fibrous fine-grained forms. | ||
| Hardness: |
5-6.5 | ||
| Luminescence: |
Non-fluorescent. | ||
| Luster: |
Vitreous - Resinous | ||
| Streak: |
greenish gray | ||
Optical Properties of Augite |
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| Gladstone-Dale: |
CI meas= 0.066 (Fair) - where the CI = (1-KPDmeas/KC) CI calc= 0.095 (Poor) - where the CI = (1-KPDcalc/KC) KPDcalc= 0.2,KPDmeas= 0.2065,KC= 0.2211 |
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| Optical Data: |
Biaxial (+), a=1.68-1.703, b=1.684-1.711, g=1.706-1.729, bire=0.0260, 2V(Calc)=48-68, 2V(Meas)=40-52. Dispersion weak to distinct, r > v. | ||
| Pleochroism (x): |
pale green, pale brownish green, pale bluish green, bluish green, or pale purple brown. | ||
| Pleochroism (y): |
pale brownish green, pale greenish brown, pink, or yellowish green. | ||
| Pleochroism (z): |
pale green, pale brownish green, pale bluish green, yellowish green, or pale purple brown. | ||
Calculated Properties of Augite |
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| Electron Density: |
relectron=3.37 gm/cc |
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| Fermion Index |
Fermion Index = 0.02382 Boson Index = 0.97618 |
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| Photoelectric: |
PEAugite = 4.80 barns/electron |
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Augite is Not Radioactive |
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Augite Classification |
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| Dana Class: |
65.1.3a.3 (65)Inosilicate Single-Width Unbranched Chains, W=1 | ||
| (65.1)with chains P=2 | |||
| (65.1.3a)C2/c clinopyroxenes (Ca clinopyroxenes) | |||
| Strunz Class: |
VIII/F.01-90 VIII - Silicates | ||
| VIII/F - Inosilicates (chain and band) double chains [Si2O6]4- | |||
| VIII/F.01 - Pyroxene group, Clinopyroxene | |||
Other Augite Information |
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| References: |
NAME( Duda&Rejl90) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Heinrich65) | ||
| See Also: |
Links to other databases for Augite : 1 - Alkali-Nuts(English) 2 - Alkali-Nuts(Francais) 3 -Am. Min. Crystal Structure Database 4 - Amethyst Galleries' Mineral Gallery 5 - Applied Mineralogy 6 -Athena 7 - CalTech Mineral Spectroscopy 8 - Crocoite.com Mineral Locations 9 - EUROmin Project 10 - Franklin Minerals(Dunn) 11 - Glendale Community College 12 -Google Images 13 -Google Scholar 14 -Handbook of Mineralogy (MinSocAm) 15 -Handbook of Mineralogy (UofA) 16 - HyperPhysics 17 -MinDAT 18 -MinMax(Deutsch) 19 -MinMax(English) 20 - Mineral and Gemstone Kingdom 21 -Mineralienatlas (Deutsch) 22 - Minerals in Thin Section-University of North Carolina 23 - Minerals of Wisconsin 24 -QUT Mineral Atlas 25 - UCLA - Petrography Thin-Sections 26 -University of Minnesota 27 - WWW-MINCRYST 28 -theimage 29 -École des Mines de Paris Search for Augite using: Visit our Advertisers for Augite : Translate Augite Mineral Data : Ask about Augite here : Print or Cut-and-Paste your Augite Specimen Label here :
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