Reppiaite
A valid IMA mineral species
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About Reppiaite
Reppia, Genoa, Liguria, Italy
Formula:
Mn2+5(VO4)2(OH)4
Colour:
Orange-red
Lustre:
Vitreous
Hardness:
3 - 3½
Specific Gravity:
3.92
Crystal System:
Monoclinic
Name:
Named after the village of Reppia, Italy, near the type locality.
Type Locality:
Unique Identifiers
Mindat ID:
3390
Long-form identifier:
mindat:1:1:3390:5
Similar Names
| Rippite | A valid IMA mineral species | K2(Nb,Ti)2(Si4O12)O(O,F) |
IMA Classification of Reppiaite
Approved
IMA Formula:
Mn2+5(V5+O4)2(OH)4
Approval year:
1991
First published:
1992
Classification of Reppiaite
8.BD.20
8 : PHOSPHATES, ARSENATES, VANADATES
B : Phosphates, etc., with additional anions, without H2O
D : With only medium-sized cations, (OH, etc.):RO4= 2:1
8 : PHOSPHATES, ARSENATES, VANADATES
B : Phosphates, etc., with additional anions, without H2O
D : With only medium-sized cations, (OH, etc.):RO4= 2:1
41.4.8.1
41 : ANHYDROUS PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
4 : (AB)5(XO4)2Zq
41 : ANHYDROUS PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
4 : (AB)5(XO4)2Zq
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference for Standard |
|---|---|---|
| Rep | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Reppiaite
Vitreous
Transparency:
Transparent
Colour:
Orange-red
Streak:
Yellow-red
Hardness:
3 - 3½ on Mohs scale
Hardness:
VHN15=90 - 110 kg/mm2 - Vickers
Density:
3.92 g/cm3 (Measured) 3.91 g/cm3 (Calculated)
Optical Data of Reppiaite
Type:
Biaxial (-)
RI values:
nα = 1.803(2) nγ = 1.810(5)
Max. Birefringence:
δ = 0.007
Based on recorded range of RI values above.
Based on recorded range of RI values above.
Interference Colours:
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
Surface Relief:
Very High (positive)
Relative to Canada balsam mounting medium (n ≈ 1.537).
Relative to Canada balsam mounting medium (n ≈ 1.537).
This shows the grain boundary and Becke line effect under plane-polarised
light, based on the contrast between this mineral's average refractive
index and the mounting medium. It does not take into account mineral
colouration.
In focus
Interference Figure:
This shows the idealized biaxial acute bisectrix (Bxa) interference figure
- the conoscopic view for a grain cut perpendicular to the acute bisectrix, using
this mineral's 2V. The two small white dots mark the melatopes - the points
where the two optic axes emerge - and are shown only when they fall within the
field of view. The coloured bands are isochromatics, and the dark bands are
isogyres.
Rotate the stage: at 0°/90° the isogyres form a cross through the melatopes; at 45° they pull apart into curved hyperbolas. That splitting on rotation - absent in a uniaxial figure - is the standard diagnostic test for telling biaxial minerals from uniaxial ones. If 2V is large, the melatopes may fall outside the field of view, as they often do at the microscope too.
No measured or calculated 2V is on file for this mineral, so the value used here (90°) is estimated from its recorded refractive indices and optic sign, not from a direct 2V measurement.
Rotate the stage: at 0°/90° the isogyres form a cross through the melatopes; at 45° they pull apart into curved hyperbolas. That splitting on rotation - absent in a uniaxial figure - is the standard diagnostic test for telling biaxial minerals from uniaxial ones. If 2V is large, the melatopes may fall outside the field of view, as they often do at the microscope too.
No measured or calculated 2V is on file for this mineral, so the value used here (90°) is estimated from its recorded refractive indices and optic sign, not from a direct 2V measurement.
Dispersion:
relatively strong
Pleochroism:
Weak
Comments:
yellow-orange to deep orange.
Chemistry of Reppiaite
Mindat Formula:
Mn2+5(VO4)2(OH)4
Element Weights:
Elements listed:
Common Impurities:
As
Crystallography of Reppiaite
Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
B2/m
Setting:
C2/m
Cell Parameters:
a = 9.614(4) Å, b = 9.561(3) Å, c = 5.396(3) Å
β = 98.39(1)°
β = 98.39(1)°
Ratio:
a:b:c = 1.006 : 1 : 0.564
Unit Cell V:
490.69 ų (Calculated from Unit Cell)
Z:
2
Crystal Structure
Load
Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
Show
Big Balls | Small Balls | Just Balls | Spacefill
Polyhedra Off | Si Polyhedra | All Polyhedra
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Big Balls | Small Balls | Just Balls | Spacefill
Polyhedra Off | Si Polyhedra | All Polyhedra
Remove metal-metal sticks
Display Options
Black Background | White Background
Perspective On | Perspective Off
2D | Stereo | Red-Blue | Red-Cyan
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2D | Stereo | Red-Blue | Red-Cyan
View
CIF File Best | x | y | z | a | b | c
CIF File Best | x | y | z | a | b | c
Rotation
Stop | Start
Stop | Start
Labels
Console Off | On | Grey | Yellow
Console Off | On | Grey | Yellow
Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure
| ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
|---|---|---|---|---|---|---|---|
| 0006613 | Reppiaite | Barbier J (1996) Crystal structure of Ni5(AsO4)2(OH)4 and its comparison to other M5(XO4)2(OH)4 compounds European Journal of Mineralogy 8 77-84 | 1996 | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 2.680 Å | (VS) |
| 4.76 Å | (S) |
| 3.00 Å | (M) |
| 2.656 Å | (M) |
| 2.155 Å | (M) |
| 1.565 Å | (M) |
| 1.510 Å | (M) |
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 7: Great Oxidation Event | <2.4 |
| 47a : [Near-surface hydration of prior minerals] | |
| 47e : [Vanadates, chromates, manganates] |
Type Occurrence of Reppiaite
General Appearance of Type Material:
Minute tabular crystals, flattened on {100}, with and irregular contour. The crystals are at most 50 µm thick and 300 µm in diameter. Under a polarizing microscope, the crystals commonly appear as fine-grained aggregates, with size of individual grains under 10 µm.
Place of Conservation of Type Material:
University of Genoa, Genoa, Italy.
Geological Setting of Type Material:
Fractures cutting manganese-bearing cherts.
Associated Minerals at Type Locality:
Synonyms of Reppiaite
Other Language Names for Reppiaite
Common Associates
Associations Based on Photo Data:
Related Minerals - Strunz-mindat Grouping
| 8.BD. | Antipovite | Cu5O2(PO4)2 |
| 8.BD.05 | Reichenbachite | Cu5(PO4)2(OH)4 |
| 8.BD.05 | Cornwallite | Cu5(AsO4)2(OH)4 |
| 8.BD.05 | Pseudomalachite | Cu5(PO4)2(OH)4 |
| 8.BD.10 | Gatehouseite | Mn2+5(PO4)2(OH)4 |
| 8.BD.10 | Arsenoclasite | Mn2+5(AsO4)2(OH)4 |
| 8.BD.15 | Parwelite | Mn10Sb2As2Si2O24 |
| 8.BD.25 | Ludjibaite | Cu5(PO4)2(OH)4 |
| 8.BD.30 | Cornubite | Cu5(AsO4)2(OH)4 |
Fluorescence of Reppiaite
Not fluorescent.
Other Information
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
Internet Links for Reppiaite
mindat.org URL:
https://www.mindat.org/min-3390.html
Please feel free to link to this page.
Please feel free to link to this page.
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Mineral Dealers:
References for Reppiaite
Reference List:
Basso, R., Lucchetti, G., Zefiro, L., Palenzona, A. (1992) Reppiaite, Mn5(OH)4(VO4)2, a new mineral from Val Graveglia (Northern Apennines, Italy) Zeitschrift für Kristallographie - Crystalline Materials, 201 (14) 223-234 doi:10.1524/zkri.1992.201.14.223
Localities for Reppiaite
Showing 6 localities.
symbol to view information about a locality.
The Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and further information on this occurrence.
? - Indicates mineral may be doubtful at this locality.
- Good crystals or important locality for species.
- World class for species or very significant.
(TL) - Type Locality for a valid mineral species.
(FRL) - First Recorded Locality for everything else (eg varieties).
All localities listed without proper references should be considered as questionable.
Italy (TL) | |
| Basso +6 other references |
| Castellaro et al. (2023) |
Spain | |
| Dill et al. (2023) |
| Dill et al. (2023) | |
| Dill et al. (2023) | |
Switzerland | |
| Stalder et al. (1998) +1 other reference |
Quick NavTopAbout ReppiaiteUnique IdentifiersSimilar NamesIMA Classification Classification Mineral SymbolsPhysical Properties Optical Data Chemistry Crystallography Crystal StructureX-Ray Powder DiffractionGeological EnvironmentType Occurrence SynonymsOther LanguagesCommon AssociatesStrunz-MindatFluorescence Other InformationInternet Links References Localities Locality List
Gambatesa Mine, Reppia, Ne, Genoa, Liguria, Italy