Jarosewichite Mineral Data

Jarosewichite Mineral Data +

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General Jarosewichite Information

Chemical Formula:

Mn++3Mn+++(AsO4)(OH)6

Composition:

Molecular Weight = 460.72 gm

Manganese 47.70 % Mn 46.19 % MnO / 17.13 % Mn₂O₃

Arsenic 16.26 % As 24.94 % As₂O₅

Hydrogen 1.31 % H 11.73 % H₂O

Oxygen 34.73 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Mn²⁺₃Mn³⁺(AsO₄)(OH)₆

Environment:

Metamorphosed Zn-Mn deposit.

IMA Status:

Approved IMA 1982

Locality:

Franklin, Sussex County, New Jersey, USA. Link to MinDat.org Location Data.

Name Origin:

Named for Eugene Jaroswich (1926-), chief chemist, Department of Mineral Sciences, National Museum of Natural History, Smithsonian Institution.

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Jarosewichite Crystallography

Axial Ratios:

a:b:c =0.2603:1:0.3968

Cell Dimensions:

a = 6.56, b = 25.2, c = 10, Z = 8; V = 1,653.12 Den(Calc)= 3.70

Crystal System:

OrthorhombicSpace Group: C 222,C mm2,C 2m2(/n)

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

By Intensity(I/I_o): 2.669(1), 3.91(0.6), 1.788(0.5),

Physical Properties of Jarosewichite

Cleavage:

None

Color:

Dark red.

Density:

3.66

Habit:

Aggregates - Made of numerous individual crystals or clusters.

Habit:

Divergent - Crystals radiate from a center without producing stellar forms.

Hardness:

4 - Fluorite

Luminescence:

Non-fluorescent.

Luster:

Vitreous (Glassy)

Streak:

reddish orange

Optical Properties of Jarosewichite

Optical Data:

Biaxial (-), a=1.78, b=1.795, g=1.805, bire=0.0250, 2V(Calc)=76, 2V(Meas)=78.

Pleochroism (x):

brownish red.

Pleochroism (y):

brownish red.

Pleochroism (z):

medium brownish red.

Calculated Properties of Jarosewichite

Electron Density:

r_electron=3.52 gm/cc
note: r_{Jarosewichite}=3.70 gm/cc.

Fermion Index

Fermion Index = 0.00016
Boson Index = 0.99984

Photoelectric:

PE_{Jarosewichite}= 23.50 barns/electron
U=PE_{Jarosewichite} x r_electron= 82.66 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Jarosewichite is Not Radioactive

Jarosewichite Classification

Dana Class:

41.1.1.3 (41)Anhydrous Phosphates, etc. Containing Hydroxyl or Halogen

(41.1)where (A++)m (XO4)p Zq, with m:p>4:1

(41.1.1)Dana Group

41.1.1.1 Chlorophoenicite (Mn,Mg)3Zn2(AsO4)(OH,O)6 C 2/m 2/m

41.1.1.2 Magnesium-chlorophoenicite (Mg,Mn)3Zn2(AsO4)(OH,O)6 C 2/m 2/m

41.1.1.3 Jarosewichite Mn3Mn(AsO4)(OH)6 C 222,C mm2,C 2m2(/n) Ortho

Strunz Class:

VII/B.17-30 VII - Phosphates, Arsenates and Vanadates

VII/B - Waterfree phosphates with unfamiliar anions F, Cl, O,OH, cations of medium size: Mg, Mn, Fe, Cu, Zn, Pseudomalachite group and related compounds

VII/B.17 - Pseudomalachite group, Magnesium-chlorophoenicite - Jarosewichite series

VII/B.17-10 Magnesium-chlorophoenicite (Mg,Mn)3Zn2(AsO4)(OH,O)6 C 2/m 2/m

VII/B.17-20 Chlorophoenicite (Mn,Mg)3Zn2(AsO4)(OH,O)6 C 2/m 2/m

VII/B.17-30 Jarosewichite Mn3Mn(AsO4)(OH)6 C 222,C mm2,C 2m2(/n) Ortho

Other Jarosewichite Information

References:

NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Dana8)

See Also:

Links to other databases for Jarosewichite :
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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Jarosewichite

Mn++3Mn+++(AsO4)(OH)6
Dana No: 41.1.1.3 Strunz No: VII/B.17-30
Locality:

Notes: