Reppiaite Mineral Data

Reppiaite Mineral Data +

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General Reppiaite Information

Chemical Formula:

Mn++5[(V,As)O4]2(OH)4

Composition:

Molecular Weight = 577.39 gm

Manganese 47.57 % Mn 61.43 % MnO

Vanadium 15.88 % V 28.35 % V₂O₅

Arsenic 2.60 % As 3.98 % As₂O₅

Hydrogen 0.70 % H 6.24 % H₂O

Oxygen 33.25 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Mn²⁺₅(VO₄)_1.8(AsO₄)_0.2(OH)₄

Environment:

Manganese chert ores.

IMA Status:

Approved IMA 1992

Locality:

Gambatesa mine, near Reppia, Val Graveglia, Italy. Link to MinDat.org Location Data.

Name Origin:

Named for the locality.

Synonym:

ICSD 36586

IMA1991-007

PDF 47-1831

Reppiaite Image

Images:

Reppiaite

Comments: Vitreous orange crystals of reppiaite embedded in matrix.
Location: Gambatesa mine, Genova, Ligurai, Italy. Scale: Crystal size 0.5mm.
© Tom Loomis / Dakota Matrix

Reppiaite Crystallography

Axial Ratios:

a:b:c =1.0048:1:0.5642

Cell Dimensions:

a = 9.604, b = 9.558, c = 5.393, Z = 2; beta = 98.45° V = 489.68 Den(Calc)= 3.92

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: C 2/m

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

By Intensity(I/I_o): 2.68(1), 4.76(0.81), 2.656(0.5),

Crystal Structure:

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Barbier J , European Journal of Mineralogy , 8 (1996) p.77-84, Crystal structure of Ni5(AsO4)2(OH)4 and its comparison to other, M5(XO4)2(OH)4 compounds

Physical Properties of Reppiaite

Cleavage:

None

Color:

Orange red.

Density:

3.92

Diaphaniety:

Transparent

Habit:

Tabular - Form dimensions are thin in one direction.

Hardness:

3-3.5 - Calcite-Copper Penny

Luster:

Vitreous (Glassy)

Streak:

orange

Optical Properties of Reppiaite

Gladstone-Dale:

CI meas= 0.16 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= 0.16 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2057,KPDmeas= 0.2057,KC= 0.2451

Optical Data:

Biaxial (-), a=1.803, g=1.81, bire=0.0070

Calculated Properties of Reppiaite

Electron Density:

r_electron=3.71 gm/cc
note: r_Reppiaite=3.92 gm/cc.

Fermion Index

Fermion Index = 0.00055
Boson Index = 0.99945

Photoelectric:

PE_Reppiaite= 17.29 barns/electron
U=PE_Reppiaite x r_electron= 64.10 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Reppiaite is Not Radioactive

Reppiaite Classification

Dana Class:

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

(41.4)where (A B)5 (XO4)2 Zq

(41.4.8)Dana Group

41.4.8.1 Reppiaite Mn5[(V,As)O4]2(OH)4 C 2/m 2/m

Strunz Class:

VII/B.11-80 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.11 - Pseudomalachite group, Ludjibaite - Reppiaite series

VII/B.11-10 Ludjibaite Cu5(PO4)2(OH)4 P1 1

VII/B.11-20 Pseudomalachite Cu5(PO4)2(OH)4 P 2₁/a 2/m

VII/B.11-30 Reichenbachite Cu5(PO4)2(OH)4 P 2₁/a 2/m

VII/B.11-40 Cornwallite Cu5(AsO4)2(OH)4 P 2₁/a 2/m

VII/B.11-50 Cornubite Cu5(AsO4)2(OH)4 P1 1

VII/B.11-60 Turanite Cu5(VO4)2(OH)4 P1 1

VII/B.11-65 Gatehouseite Mn5(PO4)2(OH)4 P 2₁2₁2₁ 2 2 2

VII/B.11-70 Arsenoclasite Mn5(AsO4)2(OH)4 P 2₁2₁2₁ 2 2 2

VII/B.11-80 Reppiaite Mn5[(V,As)O4]2(OH)4 C 2/m 2/m

Other Reppiaite Information

References:

NAME( Dana8) PHYS. PROP.(Am.Min.,Vol.78,p452,1993) OPTIC PROP.(Am.Min.,Vol.78,p452,1993)

See Also:

Links to other databases for Reppiaite :
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 -École des Mines de Paris

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Reppiaite

Mn++5[(V,As)O4]2(OH)4
Dana No: 41.4.8.1 Strunz No: VII/B.11-80
Locality:

Notes: