Strontiowhitlockite Mineral Data

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General Strontiowhitlockite Information

Chemical Formula:

Sr7(Mg,Ca)3(PO4)6[PO3(OH)]

Composition:

Molecular Weight = 1,392.01 gm

Barium 1.97 % Ba 2.20 % BaO

Strontium 44.06 % Sr 52.11 % SrO

Calcium 4.03 % Ca 5.64 % CaO

Magnesium 2.79 % Mg 4.63 % MgO

Phosphorus 15.35 % P 35.18 % P₂O₅

Hydrogen 0.07 % H 0.58 % H₂O

Oxygen 31.72 % O

______ ______

100.00 % 100.34 % = TOTAL OXIDE

Empirical Formula:

Sr₇Ca_1.4Mg_0.6Ba_0.2Mg(PO₄)₆(PO₃OH)_0.9

Environment:

In cavities in dolomite carbonatite vein cutting pyroxenites in an alkalic massif.

IMA Status:

Approved IMA 1991

Locality:

Zheleznyi iron mine, Kovdor massif, Kola Peninsula, Russia. Link to MinDat.org Location Data.

Name Origin:

Named as the stronium analog of whitlockite.

Synonym:

IMA1989-040

Strontiowhitlockite Image

Images:

Click Here for Larger Strontiowhitlockite Image

Strontiowhitlockite Bobierrite

Comments: Pale white to pink fine grained strontiowhitlockite with bobierrite.
Location: Kovdor Massif, Kola Peninsula, Murmansk District, Russia. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Strontiowhitlockite Crystallography

Axial Ratios:

a:c = 1:3.71476

Cell Dimensions:

a = 10.644, c = 39.54, Z = 6; V = 3,879.51 Den(Calc)= 3.57

Crystal System:

Trigonal - Ditrigonal PyramidalH-M Symbol (3m) Space Group: R 3c

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

By Intensity(I/I_o): 3.004(1), 2.661(0.8), 3.288(0.37),

Physical Properties of Strontiowhitlockite

Cleavage:

{0001} Indistinct

Color:

White.

Density:

3.64

Diaphaneity:

Translucent

Habit:

Fibrous - Crystals made up of fibers.

Habit:

Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite)

Habit:

Rosette - Bundled tabular aggregates resembling rose flower petals.

Hardness:

5 - Apatite

Luster:

Earthy (Dull)

Streak:

white

Optical Properties of Strontiowhitlockite

Gladstone-Dale:

CI meas= 0.007 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= -0.013 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1679,KPDmeas= 0.1647,KC= 0.1658
Ncalc = 1.59 - 1.6

Optical Data:

Uniaxial (-), e=1.598, w=1.601, bire=0.0030.

Calculated Properties of Strontiowhitlockite

Electron Density:

Bulk Density (Electron Density)=3.40 gm/cc
note: Specific Gravity of Strontiowhitlockite =3.64 gm/cc.

Fermion Index:

Fermion Index = 0.03
Boson Index = 0.97

Photoelectric:

PE_{Strontiowhitlockite}= 59.70 barns/electron
U=PE_{Strontiowhitlockite} x rElectron Density= 202.83 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Strontiowhitlockite is Not Radioactive

Strontiowhitlockite Classification

Dana Class:

38.03.04.02 (38)Anhydrous Phosphates, etc

(38.03)(A+ B++)3 (XO4)2

(38.03.04)Whitlockite group

38.03.04.01 Whitlockite Ca9(Mg,Fe)(PO4)6(PO3OH) R 3c 3m

38.03.04.02 Strontiowhitlockite Sr7(Mg,Ca)3(PO4)6[PO3(OH)] R 3c 3m

38.03.04.03 Merrillite-(Ca)* (Ca,[])19Mg2(PO4)14 R 3c 3m

38.03.04.04 Merrillite Ca18Na2Mg2(PO4)14 R 3c 3m

38.03.04.05 Merrillite-(Y)* Ca16Y2Mg2(PO4)14 R 3c 3m

38.03.04.06 Ferromerrillite! Ca9NaFe(PO4)7 R 3c 3m

38.03.04.07 Tuite! Ca3(PO4)2 R 3m 3m

38.03.04.08 Bobdownsite! Ca9Mg(PO3F)(PO4)6 R 3c 3m

Strunz Class:

08.AC.45 08 - PHOSPHATES, ARSENATES, VANADATES

08.A - Phosphates, etc. without additional anions, without H2O

08.AC -With medium-sized and large cations

08.AC.45 Merrillite-(Ca)* (Ca,[])19Mg2(PO4)14 R 3c 3m

08.AC.45 Merrillite Ca18Na2Mg2(PO4)14 R 3c 3m

08.AC.45 Merrillite-(Y)* Ca16Y2Mg2(PO4)14 R 3c 3m

08.AC.45 Strontiowhitlockite Sr7(Mg,Ca)3(PO4)6[PO3(OH)] R 3c 3m

08.AC.45 Whitlockite Ca9(Mg,Fe)(PO4)6(PO3OH) R 3c 3m

08.AC.45 Ferromerrillite! Ca9NaFe(PO4)7 R 3c 3m

08.AC.45 Tuite! Ca3(PO4)2 R 3m 3m

08.AC.45 Bobdownsite! Ca9Mg(PO3F)(PO4)6 R 3c 3m

Other Strontiowhitlockite Information

References:

NAME( AntBidBlaNic4) PHYS. PROP.(Am.Min.,Vol.76,p2024,1991) OPTIC PROP.(Am.Min.,Vol.76,p2024,1991)

See Also:

Links to other databases for Strontiowhitlockite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - Ecole des Mines de Paris
4 - Google Images
5 - Google Scholar
6 - Handbook of Mineralogy (MinSocAm)
7 - Handbook of Mineralogy (UofA)
8 - MinDAT
9 - MinMax(Deutsch)
10 - MinMax(English)
11 - Mineralienatlas (Deutsch)
12 - QUT Mineral Atlas
13 - Ruff.Info

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Strontiowhitlockite

Sr7(Mg,Ca)3(PO4)6[PO3(OH)]
Dana No: 38.03.04.02 Strunz No: 08.AC.45
Locality:

Notes: