Parabrandtite Mineral Data

Parabrandtite Mineral Data +

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General Parabrandtite Information

Chemical Formula:

Ca2Mn++(AsO4)·2(H2O)

Composition:

Molecular Weight = 448.96 gm

Calcium 17.85 % Ca 24.98 % CaO

Manganese 12.24 % Mn 15.80 % MnO

Arsenic 33.38 % As 51.19 % As₂O₅

Hydrogen 0.90 % H 8.03 % H₂O

Oxygen 35.64 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Ca₂Mn²⁺(AsO₄)₂·2(H₂O)

Environment:

Found in a cavity in primary ore at Sterling.

IMA Status:

Approved IMA 1987

Locality:

Sterling Hill mine, Susex County, New Jersey, USA. Link to MinDat.org Location Data.

Name Origin:

Named for its dimorphic relationship to brandtite.

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Parabrandtite Crystallography

Axial Ratios:

a:b:c =0.8377:1:0.8021

Cell Dimensions:

a = 5.89, b = 7.031, c = 5.64, Z = 1; alpha = 96.77°, beta = 109.32°, gamma = 108.47° V = 207.60 Den(Calc)= 3.59

Crystal System:

TriclinicSpace Group: P1,P 1

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

By Intensity(I/I_o): 2.811(1), 3.09(0.8), 3.61(0.7),

Physical Properties of Parabrandtite

Cleavage:

[010] Perfect, [110] Perfect

Color:

Colorless.

Density:

3.55

Diaphaniety:

Transparent

Habit:

Aggregates - Made of numerous individual crystals or clusters.

Hardness:

3-4 - Calcite-Fluorite

Luminescence:

Non-fluorescent.

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Parabrandtite

Gladstone-Dale:

CI meas= -0.053 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= -0.041 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2018,KPDmeas= 0.204,KC= 0.1938

Optical Data:

Biaxial (+), a=1.701, b=1.721, g=1.751, bire=0.0500, 2V(Calc)=80, 2V(Meas)=79.9. Dispersion r > v weak.

Calculated Properties of Parabrandtite

Electron Density:

r_electron=3.44 gm/cc
note: r_{Parabrandtite}=3.59 gm/cc.

Fermion Index

Fermion Index = 0.00041
Boson Index = 0.99959

Photoelectric:

PE_{Parabrandtite}= 28.02 barns/electron
U=PE_{Parabrandtite} x r_electron= 96.34 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Parabrandtite is Not Radioactive

Parabrandtite Classification

Dana Class:

40.2.2.8 (40)Hydrated Phosphates, etc

(40.2)where A++ (B++)2 (XO4) · x(H2O)

(40.2.2)Fairfieldite Subgroup (Triclinic: P1¯)

40.2.2.1 Fairfieldite Ca2(Mn,Fe)(PO4)2·2(H2O) P1 1

40.2.2.2 Messelite Ca2(Fe,Mn)(PO4)2·2(H2O) P1 1

40.2.2.3 Collinsite Ca2(Mg,Fe)(PO4)2·2(H2O) P1 1

40.2.2.4 Cassidyite Ca2(Ni,Mg)(PO4)2·2(H2O) P1 1

40.2.2.5 Talmessite Ca2Mg(AsO4)2·2(H2O) P1 1

40.2.2.6 Gaitite Ca2Zn(AsO4)2·2(H2O) P1 1

40.2.2.7 Roselite-beta Ca2(Co,Mg)(AsO4)2·2(H2O) P 1 or P1 Tri

40.2.2.8 Parabrandtite Ca2Mn(AsO4)·2(H2O) P1,P 1 Tri

40.2.2.9 Hillite! Ca2(Zn,Mg)[PO4]2·2(H2O) P1 1

Strunz Class:

VII/C.17-70 VII - Phosphates, Arsenates and Vanadates

VII/C - Water-bearing phosphates without unfamiliar anions, cations of medium and big size: Fe, Mn, Zn, Mg and Ca, (NH4)1+

VII/C.17 - Collinsite - Wendwilsonite series

VII/C.17-10 Collinsite Ca2(Mg,Fe)(PO4)2·2(H2O) P1 1

VII/C.17-15 Hillite! Ca2(Zn,Mg)[PO4]2·2(H2O) P1 1

VII/C.17-20 Messelite Ca2(Fe,Mn)(PO4)2·2(H2O) P1 1

VII/C.17-30 Fairfieldite Ca2(Mn,Fe)(PO4)2·2(H2O) P1 1

VII/C.17-40 Cassidyite Ca2(Ni,Mg)(PO4)2·2(H2O) P1 1

VII/C.17-50 Talmessite Ca2Mg(AsO4)2·2(H2O) P1 1

VII/C.17-60 Gaitite Ca2Zn(AsO4)2·2(H2O) P1 1

VII/C.17-70 Parabrandtite Ca2Mn(AsO4)·2(H2O) P1,P 1 Tri

VII/C.17-80 Roselite-beta Ca2(Co,Mg)(AsO4)2·2(H2O) P 1 or P1 Tri

VII/C.17-90 Wendwilsonite Ca2(Mg,Co)(AsO4)2·2(H2O) P 2₁/c 2/m

VII/C.17-100 Roselite Ca2(Co,Mg)(AsO4)2·2(H2O) P 2₁/c 2/m

VII/C.17-110 Brandtite Ca2(Mn,Mg)(AsO4)2·2(H2O) P 2₁/c 2/m

VII/C.17-120 Zincroselite Ca2Zn(AsO4)2·2(H2O) P 2₁/c 2/m

Other Parabrandtite Information

References:

NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Am.Min.,Vol.73,p1496,1988)

See Also:

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

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Parabrandtite

Ca2Mn++(AsO4)·2(H2O)
Dana No: 40.2.2.8 Strunz No: VII/C.17-70
Locality:

Notes: