Despujolsite Mineral Data

Despujolsite Mineral Data +

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General Despujolsite Information

Chemical Formula:

Ca3Mn++++(SO4)2(OH)6·3(H2O)

Composition:

Molecular Weight = 523.39 gm

Calcium 22.97 % Ca 32.14 % CaO

Manganese 10.50 % Mn 16.61 % MnO₂

Hydrogen 2.31 % H 20.65 % H₂O

Sulfur 12.25 % S 30.59 % SO₃

Oxygen 51.97 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Ca₃Mn⁴⁺(SO₄)₂(OH)₆·3(H₂O)

IMA Status:

Approved IMA 1968

Locality:

Link to MinDat.org Location Data.

Synonym:

ICSD 15729

PDF 20-226

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Despujolsite Crystallography

Axial Ratios:

a:c = 1:1.257

Cell Dimensions:

a = 8.56, c = 10.76, Z = 2; V = 682.80 Den(Calc)= 2.55

Crystal System:

Hexagonal - Ditrigonal DipyramidalH-M Symbol (6 m2) Space Group: P 62c

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

By Intensity(I/I_o): 3.34(1), 2.129(0.8), 4.26(0.8),

Physical Properties of Despujolsite

Cleavage:

[???] Good

Color:

Lemon.

Density:

2.46

Diaphaniety:

Transparent to Translucent

Fracture:

Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.

Hardness:

2.5 - Finger Nail

Luster:

Vitreous (Glassy)

Optical Properties of Despujolsite

Gladstone-Dale:

CI meas= -0.057 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= -0.02 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2624,KPDmeas= 0.272,KC= 0.2573

Optical Data:

Uniaxial (+), w=1.656, e=1.682, bire=0.0260.

Calculated Properties of Despujolsite

Electron Density:

r_electron=2.58 gm/cc
note: r_Despujolsite=2.55 gm/cc.

Fermion Index

Fermion Index = 0.00148
Boson Index = 0.99852

Photoelectric:

PE_Despujolsite= 6.16 barns/electron
U=PE_Despujolsite x r_electron= 15.90 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Despujolsite is Not Radioactive

Despujolsite Classification

Dana Class:

31.7.6.1 (31)Hydrated Sulfates Containing Hydroxyl or Halogen

(31.7)where (A+ B++)2 (XO4) Zq·x(H2O)

(31.7.6)Dana Group

31.7.6.1 Despujolsite Ca3Mn(SO4)2(OH)6·3(H2O) P 62c 6 m2

31.7.6.2 Schaurteite Ca3Ge(SO4)2(OH)6·3(H2O) P 62c 6 m2

31.7.6.3 Fleischerite Pb3Ge(SO4)2(OH)6·3(H2O) P 6₃/mmc 6/m 2/m 2/m

31.7.6.4 Mallestigite! Pb3Sb(SO4)(AsO4)(OH)6·3(H2O) P 6₃ 6 2 2

Strunz Class:

VI/D.11-10 VI - Sulfates,Chromates,Molybdates and Tungstates

VI/D - Water-bearing sulfates with unfamiliar anions. cations of medium and very big size

VI/D.11 - Despujolsite - Fleischerite series

VI/D.11-10 Despujolsite Ca3Mn(SO4)2(OH)6·3(H2O) P 62c 6 m2

VI/D.11-20 Schaurteite Ca3Ge(SO4)2(OH)6·3(H2O) P 62c 6 m2

VI/D.11-30 Fleischerite Pb3Ge(SO4)2(OH)6·3(H2O) P 6₃/mmc 6/m 2/m 2/m

VI/D.11-40 Mallestigite! Pb3Sb(SO4)(AsO4)(OH)6·3(H2O) P 6₃ 6 2 2

Other Despujolsite Information

References:

PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Despujolsite :
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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Despujolsite

Ca3Mn++++(SO4)2(OH)6·3(H2O)
Dana No: 31.7.6.1 Strunz No: VI/D.11-10
Locality:

Notes: