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 % V2 O5
Arsenic 2.60 % As 3.98 % As2 O5
Hydrogen 0.70 % H 6.24 % H2 O
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
X Ray Diffraction:
By Intensity(I/Io ): 2.68(1), 4.76(0.81), 2.656(0.5),
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:
PEReppiaite = 17.29 barns/electronU=PEReppiaite x r Electron 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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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: