Pararobertsite Mineral Data

Pararobertsite Mineral Data +

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General Pararobertsite Information

Chemical Formula:

Ca2Mn+++3(PO4)3O2·3(H2O)

Composition:

Molecular Weight = 615.93 gm

Calcium 13.01 % Ca 18.21 % CaO

Manganese 26.76 % Mn 38.45 % Mn₂O₃

Phosphorus 15.09 % P 34.57 % P₂O₅

Hydrogen 0.98 % H 8.77 % H₂O

Oxygen 44.16 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Ca₂Mn³⁺₃(PO₄)₃O₂·3(H₂O)

IMA Status:

Approved IMA 1989

Locality:

Link to MinDat.org Location Data.

Synonym:

ICSD 89712

PDF 45-1440

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Pararobertsite Crystallography

Axial Ratios:

a:b:c =0.6656:1:0.8362

Cell Dimensions:

a = 8.825, b = 13.258, c = 11.087, Z = 4; beta = 101.19° V = 1,272.54 Den(Calc)= 3.21

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: P 2₁/c

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

By Intensity(I/I_o): 8.69(1), 2.884(0.6), 5.66(0.6),

Crystal Structure:

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Kampf A R , American Mineralogist , 85 (2000) p.1302-1306, The crystal structure of pararobertsite and its relationship to mitridatite

Physical Properties of Pararobertsite

Cleavage:

[100] Perfect

Color:

Bronze, Yellow, Dark red.

Density:

3.22

Diaphaniety:

Transparent

Hardness:

2 - Gypsum

Luster:

Vitreous (Glassy)

Streak:

brown red

Optical Properties of Pararobertsite

Gladstone-Dale:

CI meas= -0.018 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= -0.021 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2523,KPDmeas= 0.2516,KC= 0.2471

Optical Data:

Biaxial (-), a=1.79, b=1.81, g=1.83, bire=0.0400, 2V(Calc)=88, 2V(Meas)=84.

Calculated Properties of Pararobertsite

Electron Density:

r_electron=3.16 gm/cc
note: r_{Pararobertsite}=3.22 gm/cc.

Fermion Index

Fermion Index = 0.00038
Boson Index = 0.99962

Photoelectric:

PE_{Pararobertsite}= 9.13 barns/electron
U=PE_{Pararobertsite} x r_electron= 28.83 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Pararobertsite is Not Radioactive

Pararobertsite Classification

Dana Class:

42.8.5.2 (42)Hydrated Phosphates, etc., Containing Hydroxyl or Halogen

(42.8)where (AB)7 (XO4)4 Zq · x(H2O)

(42.8.5)Dana Group

42.8.5.1 Kolfanite Ca2Fe3O2(AsO4)3·2(H2O) A2/a 2/m

42.8.5.2 Pararobertsite Ca2Mn3(PO4)3O2·3(H2O) P 2₁/c 2/m

42.8.5.3 Sailaufite! Ca2Mn3O2(AsO4)2(CO3)·3(H2O) Cm m

Strunz Class:

VII/D.30-60 VII - Phosphates, Arsenates and Vanadates

VII/D - Water-bearing phosphates with unfamiliar anions, cations of very big and medium size: Al, Mg and Ca, Na, K

VII/D.30 - Mitridatite series

VII/D.30-10 Xanthoxenite Ca4Fe2(PO4)4(OH)2·3(H2O) P1 1

VII/D.30-20 Kolfanite Ca2Fe3O2(AsO4)3·2(H2O) A2/a 2/m

VII/D.30-30 Mitridatite Ca2Fe3(PO4)3O2·3(H2O) A2/a 2/m

VII/D.30-40 Arseniosiderite Ca2Fe3(AsO4)3O2·3(H2O) A2/a 2/m

VII/D.30-45 Sailaufite! Ca2Mn3O2(AsO4)2(CO3)·3(H2O) Cm m

VII/D.30-50 Robertsite Ca6Mn9(PO4)9O6(H2O)6·3(H2O) A2/a 2/m

VII/D.30-60 Pararobertsite Ca2Mn3(PO4)3O2·3(H2O) P 2₁/c 2/m

Other Pararobertsite Information

References:

PHYS. PROP.(Am.Min.,Vol.75,p1211,1990) OPTIC PROP.(Am.Min.,Vol.75,p1211,1990)

See Also:

Links to other databases for Pararobertsite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - EUROmin Project 4 -Google Images 5 -Google Scholar 6 -MinDAT 7 -MinMax(Deutsch) 8 -MinMax(English) 9 -Mineralienatlas (Deutsch) 10 -QUT Mineral Atlas 11 -École des Mines de Paris

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Pararobertsite

Ca2Mn+++3(PO4)3O2·3(H2O)
Dana No: 42.8.5.2 Strunz No: VII/D.30-60
Locality:

Notes: