Mineralogy Database

Augite Mineral Data

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General Augite Information

Help on Chemical  Formula: Chemical Formula: (Ca,Na)(Mg,Fe,Al,Ti)(Si,Al)2O6
Help on Composition: 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
Help on Empirical Formula: Empirical Formula: Ca0.9Na0.1Mg0.9Fe2+0.2Al0.4Ti0.1Si1.9O6
Help on Environment: Environment: Basic igneous and metamorphic rocks.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1792
Help on Locality: Locality: Common world wide. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: From the Greek auge - "luster."
Help on Name Pronunciation: Name Pronunciation: Augite Say AUGITE
Help on Synonym: Synonym: Fassaite
  ICSD 9257
  PDF 24-203

Augite Image

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Comments: Clear, dark gray augite prisms in matrix.
Location: Isle of Ischia, near Naples, Compania, Italy. Scale: Size Not Given.
© Lou Perloff / Photo Atlas of Minerals

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  Calzirtite   Augite   Richterite

Comments: Gray irregular grain of calzirtite (see arrow) in fibrous augite with dark red richterite.
Location: Jacupiranga Mine, Cajati, Sao Paulo, Brazil. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

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  Tuscanite   Augite

Comments: Translucent tuscanite microcrystal in in vug in low-Fe augite (var. fassaite).
Location: Pitigliano Quarry, Grosseto, Tuscany, Italy. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Augite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =1.0888:1:0.5833
Help on Cell Dimensions: Cell Dimensions: a = 9.8, b = 9, c = 5.25, Z = 4; beta = 105° V = 447.27 Den(Calc)= 3.51
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: C 2/c
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 1.43(1), 1.62(1), 2.99(1),
Help on Forms: Forms:

Dbl Clk - Start-Stop Rotation
RMB - Cycle Display Modes
Drag1 - Manipulate Crystal
Drag2 - Resize

S - Stereo
I - Indicies
<space> - Start-Stop Rotation
F - Fit to Screen
M - Menu

Help on Above

Forms: ( 0 1 0) ( 1 1 0) ( 1 1 1) ( 1 0 0)

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Physical Properties of Augite

Help on Cleavage: Cleavage: {110} Perfect, {010} Indistinct
Help on Color: Color: Brown green, Green, Light brown, Dark brown, Black.
Help on Density: Density: 3.2 - 3.6, Average = 3.4
Help on Diaphaneity: Diaphaneity: Translucent to opaque
Help on Fracture: Fracture: Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.
Help on Habit: Habit: Columnar - Forms columns
Help on Habit: Habit: Granular - Generally occurs as anhedral to subhedral crystals in matrix.
Help on Habit: Habit: Massive - Fibrous - Distinctly fibrous fine-grained forms.
Help on Hardness: Hardness: 5-6.5
Help on Luminescence: Luminescence: Non-fluorescent.
Help on Luster: Luster: Vitreous - Resinous
Help on Streak: Streak: greenish gray

Optical Properties of Augite

Help on Gladstone-Dale: 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
Ncalc = 1.71 - 1.8
Help on Optical Data: 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.
Help on Pleochroism (x): Pleochroism (x): pale green, pale brownish green, pale bluish green, bluish green, or pale purple brown.
Help on Pleochroism (y): Pleochroism (y): pale brownish green, pale greenish brown, pink, or yellowish green.

Calculated Properties of Augite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.37 gm/cc
note: Specific Gravity of Augite =3.40 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.02
Boson Index = 0.98
Help on Photoelectric: Photoelectric: PEAugite = 4.80 barns/electron
U=PEAugite x rElectron Density= 16.17 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Augite is Not Radioactive

Augite Classification

Help on  Dana Class: Dana Class: 65.01.03a.03 (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
Help on  Strunz Class: 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 Augite Information

Help on See Also: 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 - Athena
6 - CalTech Mineral Spectroscopy
7 - EUROmin Project
8 - Ecole des Mines de Paris
9 - Franklin Minerals(Dunn)
10 - GeoScienceWorld
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 - Mineral and Gemstone Kingdom
19 - Mineralienatlas (Deutsch)
20 - Minerals in Thin Section-University of North Carolina
21 - Online Mineral Museum
22 - QUT Mineral Atlas
23 - Ruff.Info
24 - UCLA - Petrography Thin-Sections
26 - theimage

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Dana No: 65.01.03a.03 Strunz No: 09.DA.15





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