Parabrandtite Mineral Data

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.

Name Pronunciation:

Parabrandtite + Pronunciation

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:

Triclinic Space 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

Diaphaneity:

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= -0.016 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1968,KPDmeas= 0.204,KC= 0.1938
Ncalc = 1.69 - 1.71

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:

Bulk Density (Electron Density)=3.52 gm/cc
note: Specific Gravity of Parabrandtite =3.68 gm/cc.

Fermion Index:

Fermion Index = 0.0004134249
Boson Index = 0.9995865751

Photoelectric:

PE_{Parabrandtite}= 28.02 barns/electron
U=PE_{Parabrandtite} x rElectron Density= 98.76 barns/cc.

Radioactivity:

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

Parabrandtite Classification

Dana Class:

40.02.02.08 (40)Hydrated Phosphates, etc

(40.02)where A++ (B++)2 (XO4) ï¿½ x(H2O)

(40.02.02)Fairfieldite Subgroup (Triclinic: P-1ï¿½)

40.02.02.01 Fairfieldite Ca2(Mn,Fe)(PO4)2•2(H2O) P1 1

40.02.02.02 Messelite Ca2(Fe,Mn)(PO4)2•2(H2O) P1 1

40.02.02.03 Collinsite Ca2(Mg,Fe)(PO4)2•2(H2O) P1 1

40.02.02.04 Cassidyite Ca2(Ni,Mg)(PO4)2•2(H2O) P1 1

40.02.02.05 Talmessite Ca2Mg(AsO4)2•2(H2O) P1 1

40.02.02.06 Gaitite Ca2Zn(AsO4)2•2(H2O) P1 1

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

40.02.02.08 Parabrandtite Ca2Mn(AsO4)•2(H2O) P1,P 1 Tri

40.02.02.09 Hillite! Ca2(Zn,Mg)[PO4]2•2(H2O) P1 1

40.02.02.10 Nickeltalmessite! Ca2Ni(AsO4)2•2H2O P 1

Strunz Class:

08.CG.05 08 - PHOSPHATES, ARSENATES, VANADATES

08.C - Phosphates without Additional Anions, with H2O

08.CG -With large and medium-sized cations, RO4:H2O = 1:1

08.CG.05 Collinsite Ca2(Mg,Fe)(PO4)2•2(H2O) P1 1

08.CG.05 Gaitite Ca2Zn(AsO4)2•2(H2O) P1 1

08.CG.05 Cassidyite Ca2(Ni,Mg)(PO4)2•2(H2O) P1 1

08.CG.05 Fairfieldite Ca2(Mn,Fe)(PO4)2•2(H2O) P1 1

08.CG.05 Messelite Ca2(Fe,Mn)(PO4)2•2(H2O) P1 1

08.CG.05 Parabrandtite Ca2Mn(AsO4)•2(H2O) P1,P 1 Tri

08.CG.05 Uranophane-beta Ca[(UO2)SiO3(OH)]2•(H2O) P 2₁/a 2/m

08.CG.05 Talmessite Ca2Mg(AsO4)2•2(H2O) P1 1

08.CG.05 Hillite! Ca2(Zn,Mg)[PO4]2•2(H2O) P1 1

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 - Ecole des Mines de Paris
5 - Franklin Minerals(Dunn)
6 - GeoScienceWorld
7 - Google Images
8 - Google Scholar
9 - Handbook of Mineralogy (MinSocAm)
10 - Handbook of Mineralogy (UofA)
11 - MinDAT
12 - Mineralienatlas (Deutsch)
13 - Online Mineral Museum
14 - QUT Mineral Atlas
15 - Ruff.Info

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Parabrandtite

Ca2Mn++(AsO4)•2(H2O)
Dana No: 40.02.02.08 Strunz No: 08.CG.05
Locality:

Notes:

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