Mineralogy Database

Aegirine-augite Mineral Data

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General Aegirine-augite Information

Help on Chemical  Formula: Chemical Formula: (Ca,Na)(Mg,Fe++,Fe+++)[Si2O6]
Help on Composition: Composition: Molecular Weight = 228.05 gm
   Sodium      2.52 %  Na    3.40 % Na2O
   Calcium    13.18 %  Ca   18.44 % CaO
   Magnesium   5.33 %  Mg    8.84 % MgO
   Iron       12.24 %  Fe    7.88 % FeO /  8.75 % Fe2O3
   Silicon    24.63 %  Si   52.69 % SiO2
   Oxygen     42.09 %  O
             ______        ______ 
             100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Ca0.75Na0.25Mg0.5Fe2+0.25Fe3+0.25(Si2O6)
Help on Environment: Environment: Characteristic mineral of alkaline rocks, particularly syenites and iron-rich metamorphic and metasomatic rocks.
Help on IMA Status: IMA Status: Not Approved IMA 1950
Help on Locality: Locality: Common world-wide. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Name derived from its intermediate pyroxene composition. This is not an end-member species.
Help on Name Pronunciation: Name Pronunciation: Aegirine-augite Say AEGIRINE-AUGITE

Aegirine-augite Image

Click Here for Larger   Image in a New Browser Window Images:
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  Dellaventuraite   Aegirine-augite

Comments: View in plane-polarized light of reddish brown dellaventuraite (OPTK) as an overgrowth on purple-gray aegirine-augite (AE-AG) in a matrix of rounded quartz (QZ) with minor rounded (high relief) apatite grains. (AmMin 90:306).
Location: Kajlidongri manganese mine, Jhabua District, Madhya Pradesh, India. Scale: Picture size 2.5 cm.
© American Mineralogist

Aegirine-augite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =1.1012:1:0.5984
Help on Cell Dimensions: Cell Dimensions: a = 9.68, b = 8.79, c = 5.26, Z = 4; beta = 105° V = 432.31 Den(Calc)= 3.50
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: C 2/c

Physical Properties of Aegirine-augite

Help on Cleavage: Cleavage: {110} Very Good, {100} Parting
Help on Color: Color: Dark green, Black, Green, Pale greenish yellow, Greenish gray.
Help on Density: Density: 3.4 - 3.6, Average = 3.5
Help on Diaphaneity: Diaphaneity: Translucent to opaque
Help on Fracture: Fracture: Brittle - Splintery - Brittle fracture leaving splintery fragments.
Help on Habit: Habit: Anhedral Grains - Granular minerals without the expression of crystal shapes
Help on Habit: Habit: Fibrous - Crystals made up of fibers.
Help on Habit: Habit: Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).
Help on Hardness: Hardness: 6 - Orthoclase
Help on Luster: Luster: Vitreous (Glassy)

Optical Properties of Aegirine-augite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2149,KPDmeas= 0.2149,KC= 0.2148
Ncalc = 1.73 - 1.77
Help on Optical Data: Optical Data: Biaxial (-), a=1.7-1.76, b=1.71-1.8, g=1.73-1.813, bire=0.0300-0.0530, 2V(Calc)=58-72, 2V(Meas)=70-110. Dispersion r > v moderate.

Calculated Properties of Aegirine-augite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.46 gm/cc
note: Specific Gravity of Aegirine-augite =3.50 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.01
Boson Index = 0.99
Help on Photoelectric: Photoelectric: PEAegirine-augite = 6.34 barns/electron
U=PEAegirine-augite x rElectron Density= 21.94 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Aegirine-augite is Not Radioactive

Aegirine-augite Classification

Help on  Dana Class: Dana Class: 65.01.03b.02 (65)Inosilicate Single-Width Unbranched Chains, W=1
  (65.01)with chains P=2
  (65.01.03b)C2/c clinopyroxenes (intermediate clinopyroxenes)
65.01.03b.01 Omphacite (Ca,Na)(Mg,Fe,Al)Si2O6 P 2/n 2/m
65.01.03b.02 Aegirine-augite* (Ca,Na)(Mg,Fe,Fe)[Si2O6] C 2/c 2/m
Help on  Strunz Class: Strunz Class: 09.DA.20 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.20 Aegirine-augite* (Ca,Na)(Mg,Fe,Fe)[Si2O6] C 2/c 2/m
09.DA.20 Omphacite (Ca,Na)(Mg,Fe,Al)Si2O6 P 2/n 2/m

Other Aegirine-augite Information

Help on References: References: NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Dana8)
Help on See Also: See Also: Links to other databases for Aegirine-augite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - MinDAT
7 - Mineralienatlas (Deutsch)
8 - Online Mineral Museum
9 - QUT Mineral Atlas
10 - Ruff.Info

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Dana No: 65.01.03b.02 Strunz No: 09.DA.20





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