Olgite Mineral Data
General Olgite Information
Chemical Formula:
Na(Sr,Ba)PO4
Composition:
Molecular Weight = 227.95 gm
Barium 27.11 % Ba 30.27 % BaO
Sodium 10.09 % Na 13.59 % Na2 O
Strontium 21.14 % Sr 25.00 % SrO
Phosphorus 13.59 % P 31.14 % P2 O5
Oxygen 28.08 % O
______ ______
100.00 % 100.00 % = TOTAL OXIDE
Empirical Formula:
NaSr0.55 Ba0.45 (PO4 )
Environment:
Nepheline syenite pegmatite. Olgite is now the series name for bario-olgite and strontio-olgite
IMA Status:
Discredited IMA 2008 - Approved IMA 1980
Locality:
Lovozero massif, Kola Peninsula, Russia. Link to MinDat.org Location Data.
Name Origin:
Named for Olga Anisimovne-Vorobiova (1902-1974), Russian mineralogist.
Name Pronunciation:
Olgite
Synonym:
ICSD 20962
Olgite I
PDF 33-1212
Olgite Image
Images:
Olgite Crystallography
Axial Ratios:
a:c = 1:1.2661
Cell Dimensions:
a = 5.558, c = 7.037, Z = 2; V = 188.26 Den(Calc)= 4.02
Crystal System:
Trigonal - Hexagonal Scalenohedral H-M Symbol (3 2/m) Space Group: P 3 m1
X Ray Diffraction:
By Intensity(I/Io ): 2.763(1), 2.842(1), 1.982(0.63),
Physical Properties of Olgite
Color:
Blue, Blue green.
Density:
3.94
Habit:
Microscopic Crystals - Crystals visible only with microscopes.
Habit:
Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).
Hardness:
4.5 - Between Fluorite and Apatite
Luster:
Vitreous (Glassy)
Streak:
white
Optical Properties of Olgite
Gladstone-Dale:
CI meas = 0.001 (Superior) - where the CI = (1-KPDmeas /KC ) CI calc = 0.021 (Excellent) - where the CI = (1-KPDcalc /KC )
KPDcalc = 0.1545,KPDmeas = 0.1576,KC = 0.1578 Ncalc = 1.62 - 1.63
Optical Data:
Uniaxial (-), e=1.619, w=1.623, bire=0.0040.
Calculated Properties of Olgite
Electron Density:
Bulk Density (Electron Density)=3.60 gm/cc note: Specific Gravity of Olgite =3.94 gm/cc.
Fermion Index:
Fermion Index = 0.06 Boson Index = 0.94
Photoelectric:
PEOlgite = 144.28 barns/electronU=PEOlgite x r Electron Density= 519.21 barns/cc.
Radioactivity:
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Olgite is Not Radioactive
Olgite Classification
Dana Class:
38.01.03.01 (38) Anhydrous Phosphates, etc
(38.01) A+ B++ XO4
(38.01.03) Dana Group
38.01.03.01 Olgite ? Na(Sr,Ba)PO4 P 3 m1 3 2/m
38.01.03.02 Bario-olgite ! Na(Ba,Sr,Na,REE)PO4 P 3 m1 3 2/m
Strunz Class:
08.AC.40 08 - PHOSPHATES, ARSENATES, VANADATES
08.A - Phosphates, etc. without additional anions, without H2O
08.AC -With medium-sized and large cations
08.AC.40 Olgite ? Na(Sr,Ba)PO4 P 3 m1 3 2/m
08.AC.40 Bario-olgite ! Na(Ba,Sr,Na,REE)PO4 P 3 m1 3 2/m
Other Olgite Information
References:
NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
See Also:
Links to other databases for Olgite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info
15 - WWW-MINCRYST
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Print or Cut-and-Paste your Olgite Specimen Label here :
Olgite
Na(Sr,Ba)PO4
Dana No: 38.01.03.01 Strunz No: 08.AC.40
Locality:
Notes:
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