|
Oligoclase Mineral Data + |
General Oligoclase Information |
|||
| (Na,Ca)(Si,Al)4O8 | |||
| 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 | |||
| ______ ______ | |||
| 100.00 % 100.00 % = TOTAL OXIDE | |||
| Na0.8Ca0.2Al1.2Si2.8O8 | |||
| Magmatic and pegmatitic rocks. | |||
| Valid Species (Pre-IMA) 1826 | |||
| Twedestrand, Norway. Link to MinDat.org Location Data. | |||
| From the Greek, oligos and kasein, "little cleavage." | |||
| Ab80 | |||
| An20 | |||
| Sunstone | |||
Oligoclase Image | |||
|
|
|
||
|
|
|
||
Oligoclase Crystallography |
|||
| a:b:c =0.6377:1:0.6651 | |||
| 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 | |||
| Triclinic - PinacoidalH-M Symbol ( 1) Space Group: C1 | |||
| By Intensity(I/Io): 3.2(1), 3.74(0.8), 4.02(0.8), | |||
Mouse |
|
||
Physical Properties of Oligoclase |
|||
| [001] Perfect, [010] Good | |||
| Brown, Colorless, Greenish, Gray, Yellowish. | |||
| 2.64 - 2.66, Average = 2.65 | |||
| Transparent to Translucent | |||
| Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern. | |||
| Euhedral Crystals - Occurs as well-formed crystals showing good external form. | |||
| Granular - Generally occurs as anhedral to subhedral crystals in matrix. | |||
| 7 - Quartz | |||
| Fluorescent. | |||
| Vitreous (Glassy) | |||
| white | |||
Optical Properties of Oligoclase |
|||
| 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 |
|||
| 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. | |||
| colorless. | |||
| colorless. | |||
| colorless. | |||
Calculated Properties of Oligoclase |
|||
relectron=2.63 gm/cc |
|||
| Fermion Index = 0.0141 Boson Index = 0.9859 |
|||
PEOligoclase = 1.98 barns/electron |
|||
| GRapi = 0 (Gamma Ray American Petroleum Institute Units) Oligoclase is Not Radioactive |
|||
Oligoclase Classification |
|||
| 76.1.3.2 (76)Tectosilicate Al-Si Framework | |||
| (76.1)with Al-Si frameworks | |||
| (76.1.3)Plagioclase series | |||
| VIII/J.07-30 VIII - Silicates | |||
| VIII/J - Tectosilicates (network) without anions unfamiliar to the tetraheders | |||
| VIII/J.07 - Feldspar group, Anorthoclase - Anorthite - Banalcite series | |||
Other Oligoclase Information |
|||
| NAME( Sinkankas66) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Heinrich65) | |||
| 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 - Glendale Community College 10 - Google Images 11 - Google Scholar 12 - Handbook of Mineralogy (MinSocAm) 13 - Handbook of Mineralogy (UofA) 14 - HyperPhysics 15 - MinDAT 16 - MinMax(Deutsch) 17 - MinMax(English) 18 - Mineral and Gemstone Kingdom 19 - Mineralienatlas (Deutsch) 20 - Philatelic Mineralogy 21 - QUT Mineral Atlas 22 - Ruff.Info 23 - Scandinavian mineral gallery Search for Oligoclase using: Visit our Advertisers for Oligoclase : AA Mineral SpecimensB & L Fine Minerals Dan Weinrich Fine Minerals Dan Weinrich Auctions Excalibur Minerals Exceptional Minerals Fabre Minerals Greenside Minerals Heliodor John Betts Fine Minerals Mason's Minerals Mineral News Mineral of the Month Club MineralsWeb Fine Minerals The GeoZone Wrights Rock Shop Translate Oligoclase Mineral Data : Ask about Oligoclase here : Print or Cut-and-Paste your Oligoclase Specimen Label here :
|
|||