Olgite Mineral Data

Olgite Mineral Data +

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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 % Na₂O

Strontium 21.14 % Sr 25.00 % SrO

Phosphorus 13.59 % P 31.14 % P₂O₅

Oxygen 28.08 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

NaSr_0.55Ba_0.45(PO₄)

Environment:

Nepheline syenite pegmatite.

IMA Status:

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.

Synonym:

ICSD 20962

PDF 33-1212

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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 - PyramidalH-M Symbol (3) Space Group: P 3

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 2.763(1), 2.842(1), 1.982(0.63),

Crystal Structure:

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Sokolova E , Hawthorne F C , Khomyakov A P , The Canadian Mineralogist , 43 (2005) p.1521-1526, Refinement of the crystal structure and revision of the, chemical formula of olgite: (Ba,Sr) (Na,Sr,REE)2 Na [PO4]2, Locality: Lovozero alkaline massif, Kola Peninsula, Russia, Sample: I

View Additional jPOWD Structure files for Olgite
[1]

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

Optical Data:

Uniaxial (-), e=1.619, w=1.623, bire=0.0040.

Calculated Properties of Olgite

Electron Density:

r_electron=3.60 gm/cc
note: r_Olgite=3.94 gm/cc.

Fermion Index

Fermion Index = 0.06324
Boson Index = 0.93676

Photoelectric:

PE_Olgite= 144.28 barns/electron
U=PE_Olgite x r_electron= 519.21 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Olgite is Not Radioactive

Olgite Classification

Dana Class:

38.1.3.1 (38)Anhydrous Phosphates, etc

(38.1)A+ B++ XO4

(38.1.3)Dana Group

38.1.3.1 Olgite Na(Sr,Ba)PO4 P 3 3

38.1.3.2 Bario-olgite! Na(Ba,Sr,Na,REE)PO4 P 3 3

Strunz Class:

VII/A.12-60 VII - Phosphates, Arsenates and Vanadates

VII/A - Waterfree phosphates [PO4]3- without unfamiliar anions, cations of very big size: Ca, Na and andre

VII/A.12 - Monetite - Schultenite series

VII/A.12-10 Monetite CaHPO4 P1 1

VII/A.12-20 Weilite CaHAsO4 P1 1

VII/A.12-30 Phosphammite (NH4)2HPO4 P 2₁/c 2/m

VII/A.12-40 Biphosphammite (NH4,K)H2PO4 I 42d 4 2m

VII/A.12-50 Archerite (K,NH4)H2PO4 I 42d 4 2m

VII/A.12-60 Olgite Na(Sr,Ba)PO4 P 3 3

VII/A.12-70 Bario-olgite! Na(Ba,Sr,Na,REE)PO4 P 3 3

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 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 - WWW-MINCRYST 13 -École des Mines de Paris

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Print or Cut-and-Paste your Olgite Specimen Label here :

Olgite

Na(Sr,Ba)PO4
Dana No: 38.1.3.1 Strunz No: VII/A.12-60
Locality:

Notes: