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Aegirine-augite Mineral Data |
General Aegirine-augite Information |
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(Ca,Na)(Mg,Fe++,Fe+++)[Si2O6] | ||
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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 | |||
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100.00 % 100.00 % = TOTAL OXIDE | |||
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Ca0.75Na0.25Mg0.5Fe2+0.25Fe3+0.25(Si2O6) | ||
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Characteristic mineral of alkaline rocks, particularly syenites and iron-rich metamorphic and metasomatic rocks. | ||
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Not Approved IMA 1950 | ||
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Common world-wide. Link to MinDat.org Location Data. | ||
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Name derived from its intermediate pyroxene composition. This is not an end-member species. | ||
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Aegirine-augite ![]() |
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Aegirine-augite Image | |||
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Aegirine-augite Crystallography |
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a:b:c =1.1012:1:0.5984 | ||
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a = 9.68, b = 8.79, c = 5.26, Z = 4; beta = 105° V = 432.31 Den(Calc)= 3.50 | ||
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Monoclinic - Prismatic H-M Symbol (2/m) Space Group: C 2/c | ||
Physical Properties of Aegirine-augite |
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{110} Very Good, {100} Parting | ||
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Dark green, Black, Green, Pale greenish yellow, Greenish gray. | ||
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3.4 - 3.6, Average = 3.5 | ||
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Translucent to opaque | ||
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Brittle - Splintery - Brittle fracture leaving splintery fragments. | ||
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Anhedral Grains - Granular minerals without the expression of crystal shapes | ||
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Fibrous - Crystals made up of fibers. | ||
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Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline). | ||
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6 - Orthoclase | ||
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Vitreous (Glassy) | ||
Optical Properties of Aegirine-augite |
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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 |
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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 |
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Bulk Density (Electron Density)=3.46 gm/cc note: Specific Gravity of Aegirine-augite =3.50 gm/cc. |
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Fermion Index = 0.01 Boson Index = 0.99 |
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PEAegirine-augite = 6.34 barns/electron U=PEAegirine-augite x rElectron Density= 21.94 barns/cc. |
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GRapi = 0 (Gamma Ray American Petroleum Institute Units) Aegirine-augite is Not Radioactive |
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Aegirine-augite Classification |
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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) | |||
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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 | |||
Other Aegirine-augite Information |
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NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Dana8) | ||
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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 Search for Aegirine-augite using: Visit our Advertisers for Aegirine-augite : Ask about Aegirine-augite here : Print or Cut-and-Paste your Aegirine-augite Specimen Label here :
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