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Oligoclase Mineral Data |
General Oligoclase Information |
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(Na,Ca)(Si,Al)4O8 | ||
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Molecular Weight = 265.42 gm | ||
Sodium 6.93 % Na 9.34 % Na2O | |||
Calcium 3.02 % Ca 4.23 % CaO | |||
Aluminum 12.20 % Al 23.05 % Al2O3 | |||
Silicon 29.63 % Si 63.38 % SiO2 | |||
Oxygen 48.22 % O | |||
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100.00 % 100.00 % = TOTAL OXIDE | |||
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Na0.8Ca0.2Al1.2Si2.8O8 | ||
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Magmatic and pegmatitic rocks. | ||
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Valid Species (Pre-IMA) 1826 | ||
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Twedestrand, Norway. Link to MinDat.org Location Data. | ||
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From the Greek, oligos and kasein, "little cleavage." | ||
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Oligoclase + Pronunciation ![]() |
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Ab80 | ||
An20 | |||
Sunstone | |||
Oligoclase Image | |||
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Oligoclase Crystallography |
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a:b:c =0.6377:1:0.6651 | ||
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a = 8.15, b = 12.78, c = 8.5, Z = 5; alpha = 94.016°, beta = 116.3333°, gamma = 88.667° V = 791.30 Den(Calc)= 2.78 | ||
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Triclinic - Pinacoidal H-M Symbol ( 1) Space Group: C1 | ||
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By Intensity(I/Io): 3.2(1), 3.74(0.8), 4.02(0.8), | ||
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Physical Properties of Oligoclase |
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{001} Perfect, {010} Good | ||
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Brown, Colorless, Greenish, Gray, Yellowish. | ||
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2.64 - 2.66, Average = 2.65 | ||
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Transparent to Translucent | ||
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Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern. | ||
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Euhedral Crystals - Occurs as well-formed crystals showing good external form. | ||
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Granular - Generally occurs as anhedral to subhedral crystals in matrix. | ||
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7 - Quartz | ||
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Fluorescent, Long UV=yellow. | ||
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Vitreous (Glassy) | ||
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white | ||
Optical Properties of Oligoclase |
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CI meas= 0.007 (Superior) - where the CI = (1-KPDmeas/KC) CI calc= 0.054 (Good) - where the CI = (1-KPDcalc/KC) KPDcalc= 0.1951,KPDmeas= 0.2047,KC= 0.2062 Ncalc = 1.54 - 1.57 |
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Biaxial (+), a=1.533-1.543, b=1.5368-1.5477, g=1.542-1.552, bire=0.0090, 2V(Calc)=82-86, 2V(Meas)=82. Dispersion none. | ||
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colorless. | ||
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colorless. | ||
Calculated Properties of Oligoclase |
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Bulk Density (Electron Density)=2.63 gm/cc note: Specific Gravity of Oligoclase =2.65 gm/cc. |
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Fermion Index = 0.01 Boson Index = 0.99 |
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PEOligoclase = 1.98 barns/electron U=PEOligoclase x rElectron Density= 5.19 barns/cc. |
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GRapi = 0 (Gamma Ray American Petroleum Institute Units) Oligoclase is Not Radioactive |
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Oligoclase Classification |
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76.01.03.02 (76)Tectosilicate Al-Si Framework | ||
(76.01)with Al-Si frameworks | |||
(76.01.03)Plagioclase series | |||
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09.FA.35 09 - SILICATES (Germanates) | ||
09.F - Tektosilicates without Zeolitic H2O | |||
09.FA -Tektosilicates without additional non-tetrahedral anions, (Al,B):Si = 1:1 | |||
Other Oligoclase Information |
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Links to other databases for Oligoclase : 1 - Alkali-Nuts(English) 2 - Alkali-Nuts(Francais) 3 - Am. Min. Crystal Structure Database 4 - Amethyst Galleries' Mineral Gallery 5 - Athena 6 - EUROmin Project 7 - Ecole des Mines de Paris 8 - Franklin Minerals(Dunn) 9 - GeoScienceWorld 10 - Glendale Community College 11 - Google Images 12 - Google Scholar 13 - Handbook of Mineralogy (MinSocAm) 14 - Handbook of Mineralogy (UofA) 15 - HyperPhysics 16 - MinDAT 17 - Mineral and Gemstone Kingdom 18 - Mineralienatlas (Deutsch) 19 - Online Mineral Museum 20 - Philatelic Mineralogy 21 - QUT Mineral Atlas 22 - Ruff.Info 23 - Scandinavian mineral gallery Search for Oligoclase using: Visit our Advertisers for Oligoclase : Ask about Oligoclase here : Print or Cut-and-Paste your Oligoclase Specimen Label here :
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