Reppiaite Mineral Data

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.

Name Pronunciation:

Reppiaite + Pronunciation

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

$Help on X Ray Diffraction:$ 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

Color:

Orange red.

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
Ncalc = 1.96

Calculated Properties of Reppiaite

Electron Density:

Bulk Density (Electron Density)=3.71 gm/cc
note: Specific Gravity of Reppiaite =3.92 gm/cc.

Fermion Index:

Fermion Index = 0.0005576749
Boson Index = 0.9994423251

Photoelectric:

PE_Reppiaite= 17.29 barns/electron
U=PE_Reppiaite x rElectron Density= 64.10 barns/cc.

Radioactivity:

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

Reppiaite Classification

Dana Class:

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

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

(41.04.08)Dana Group

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

Strunz Class:

08.BD.20 08 - PHOSPHATES, ARSENATES, VANADATES

08.B - Phosphates, etc. with Additional Anions, without H2O

08.BD -With only medium-sized cations, (OH, etc.):RO4 = 2:1

08.BD.20 Reppiaite Mn5[(V,As)O4]2(OH)4 C 2/m 2/m

Other Reppiaite Information

See Also:

Links to other databases for Reppiaite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info

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Ask about Reppiaite here :
Ask-A-Mineralogist from the Mineralogical Society of America
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Print or Cut-and-Paste your Reppiaite Specimen Label here :

Reppiaite

Mn++5[(V,As)O4]2(OH)4
Dana No: 41.04.08.01 Strunz No: 08.BD.20
Locality:

Notes: