Lapeyreite
A valid IMA mineral species
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About Lapeyreite
Formula:
Cu3O[AsO3(OH)]2 · 0.75H2O
Colour:
Dark pistachio-green
Lustre:
Adamantine, Vitreous
Specific Gravity:
4.385 (Calculated)
Crystal System:
Monoclinic
Name:
Named in honor of Laurent Lapeyre (b. 1973), an eminent mineral collector and expert on Roua minerals who found the mineral.
Unique Identifiers
Mindat ID:
38830
Long-form identifier:
mindat:1:1:38830:2
IMA Classification of Lapeyreite
Approved
IMA Formula:
Cu2+3O[As5+O3(OH)]2·H2O
Approval year:
2008
First published:
2010
Classification of Lapeyreite
8.DB.47
8 : PHOSPHATES, ARSENATES, VANADATES
D : Phosphates, etc. with additional anions, with H2O
B : With only medium-sized cations, (OH, etc.):RO4< 1:1
8 : PHOSPHATES, ARSENATES, VANADATES
D : Phosphates, etc. with additional anions, with H2O
B : With only medium-sized cations, (OH, etc.):RO4< 1:1
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 |
|---|---|---|
| Lpy | 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 Lapeyreite
Adamantine, Vitreous
Transparency:
Transparent, Translucent
Colour:
Dark pistachio-green
Streak:
Yellowish green
Tenacity:
Brittle
Cleavage:
Perfect
Perfect cleavage on {001}, and good cleavage on {100}.
Perfect cleavage on {001}, and good cleavage on {100}.
Fracture:
Conchoidal
Density:
4.385 g/cm3 (Calculated)
Optical Data of Lapeyreite
Type:
Biaxial (+)
RI values:
nα = 1.82 nβ = 1.85 nγ = 1.90
2V:
Measured: 76° , Calculated: 77°
Max. Birefringence:
δ = 0.080
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.
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.
Dispersion:
r > v, medium
Pleochroism:
Strong
Comments:
X = light yellow-green, Y = pistachio-green, Z = dark pistachio-green
Comments:
X ^ c ~ 12°, Y = a, Z = b
Chemistry of Lapeyreite
Mindat Formula:
Cu3O[AsO3(OH)]2 · 0.75H2O
Element Weights:
Elements listed:
Crystallography of Lapeyreite
Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
B2/m
Setting:
C2/m
Cell Parameters:
a = 19.158(3) Å, b = 2.9361(6) Å, c = 9.193(2) Å
β = 103.26°
β = 103.26°
Ratio:
a:b:c = 6.525 : 1 : 3.131
Unit Cell V:
503.32 ų (Calculated from Unit Cell)
Z:
8
Morphology:
Forms: {100}, {010}, and {001}.
Aggregates of elongate rectangular crystals (parallel to [010], flattened on (001)); acicular fibrous Crystals; powdery masses.
Aggregates of elongate rectangular crystals (parallel to [010], flattened on (001)); acicular fibrous Crystals; powdery masses.
Twinning:
In the type specimen, all crystals are twinned on the (001) plane. Only observed with X-rays, not binocular microscope or macroscopically.
Comment:
Z = 8/3.
Crystal Structure
Load
Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
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CIF File Best | x | y | z | a | b | c
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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) |
|---|---|---|---|---|---|---|---|
| 0005002 | Lapeyreite | Sarp H, Cerny R, Babalik H, Hatipoglu M, Mari G (2010) Lapeyreite, Cu3O[AsO3(OH)]2x0.75H2O, a new mineral: Its description and crystal structure American Mineralogist 95 171-176 |  | 2010 | Daluis Gorge, Var Valley, Alpes-Maritimes, France | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 7.36 Å | (30) |
| 5.842 Å | (40) |
| 4.476 Å | (35) |
| 3.173 Å | (90) |
| 2.984 Å | (100) |
| 2.484 Å | (80) |
| 2.396 Å | (40) |
| 2.337 Å | (35) |
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 7: Great Oxidation Event | <2.4 |
| 47a : [Near-surface hydration of prior minerals] | |
| 47d : [Arsenates, antimonates, selenates, bismuthinates] |
Type Occurrence of Lapeyreite
General Appearance of Type Material:
As aggregates in geodes of cuprite (0.5 mm diameter), invariably in intimate association with trippkeite.
Place of Conservation of Type Material:
Laboratory of Crystallography, University of Geneva, Switzerland (CR.010).
The University of Adnan Menderes, Vocational School of Memnune Inci, Karacasu-Aydın (KMY.25).
The University of Dokuz Eylül, Vocational School of Izmir, Buca-Izmir (BM.73), Turkey.
The University of Adnan Menderes, Vocational School of Memnune Inci, Karacasu-Aydın (KMY.25).
The University of Dokuz Eylül, Vocational School of Izmir, Buca-Izmir (BM.73), Turkey.
Geological Setting of Type Material:
The cupriferous ore occurs in two distinct zones 400 m apart: a northern and a southern zone situated, respectively, in the districts of Guillaume and Daluis.
Associated Minerals at Type Locality:
Synonyms of Lapeyreite
Other Language Names for Lapeyreite
Dutch:Lapeyreiet
German:Lapeyreit
Common Associates
Related Minerals - Strunz-mindat Grouping
| 8.DB. | Arangasite | Al2F(PO4)(SO4) · 9H2O |
| 8.DB. | Höslite | Fe3+3(VO4)2(SO4)(OH)(H2O)4 · 3H2O |
| 8.DB. | Camaronesite | [Fe3+(H2O)2(PO3OH)]2(SO4) · 1-2H2O |
| 8.DB.05 | Destinezite | Fe3+2(PO4)(SO4)(OH) · 6H2O |
| 8.DB.05 | Pitticite | (Fe, AsO4, H2O) (?) |
| 8.DB.05 | Diadochite | Fe3+2(PO4)(SO4)(OH) · 6H2O |
| 8.DB.07 | Wilhelmgümbelite | ZnFe2+Fe3+3(PO4)3(OH)4(H2O)5 · 2H2O |
| 8.DB.07 | Schmidite | [Zn2(Fe3+,Mn2+)2Fe3+(PO4)3(OH)3(H2O)6] · 2H2O |
| 8.DB.07 | Wildenauerite | Zn(Fe3+,Mn2+)2MnFe3+(PO4)3(OH)3(H2O)6 · 2H2O |
| 8.DB.10 | Vashegyite | Al11(PO4)9(OH)6 · 38H2O |
| 8.DB.15 | Schoonerite | ZnMn2+Fe2+2Fe3+(PO4)3(OH)2 · 9H2O |
| 8.DB.20 | Sinkankasite | Mn2+Al(PO3OH)2(OH) · 6H2O |
| 8.DB.25 | Mitryaevaite | Al6(PO4)((P,S)O3(OH,O))2F2(OH)2 · 14.5H2O |
| 8.DB.30 | Sanjuanite | Al2(PO4)(SO4)(OH) · 9H2O |
| 8.DB.35 | Sarmientite | Fe3+2(AsO4)(SO4)(OH) · 5H2O |
| 8.DB.40 | Bukovskýite | Fe3+2(AsO4)(SO4)(OH) · 9H2O |
| 8.DB.40 | Manganflurlite | ZnMn2+3Fe3+(PO4)3(OH)2(H2O)7 · 2H2O |
| 8.DB.40 | Flurlite | Zn3Mn2+Fe3+(PO4)3(OH)2 · 9H2O |
| 8.DB.42 | Bohuslavite | Fe3+4(PO4)3(SO4)(OH) · nH2O |
| 8.DB.45 | Zýkaite | Fe3+4(AsO4)3(SO4)(OH) · 15H2O |
| 8.DB.50 | Rossiantonite | Al3(PO4)(SO4)2(OH)2(H2O)14 |
| 8.DB.50 | Giniite | Fe2+Fe3+4(PO4)3(OH)5 · 2H2O |
| 8.DB.52 | 'Arctowskite' | Al9(PO4)8(OH)3 · 27H2O |
| 8.DB.55 | Sasaite | (Al,Fe3+)14(PO4)11(SO4)(OH)7 · 83H2O |
| 8.DB.60 | Mcauslanite | Fe3Al2(PO4)3(PO3OH)F · 18H2O |
| 8.DB.65 | Goldquarryite | CuCd2Al3(PO4)4F2(H2O,F)2 · 10H2O |
| 8.DB.70 | Birchite | Cd2Cu2(PO4)2(SO4) · 5H2O |
| 8.DB.75 | Braithwaiteite | NaCu5(Ti4+Sb5+)(AsO4)4(HAsO4)2O2 · 8H2O |
Fluorescence of Lapeyreite
none
Other Information
Notes:
The mineral is soluble in diluted HCl
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 Lapeyreite
mindat.org URL:
https://www.mindat.org/min-38830.html
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References for Lapeyreite
Localities for Lapeyreite
Showing 1 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.
France (TL) | |
| Sarp et al. (2010) |
Quick NavTopAbout LapeyreiteUnique IdentifiersIMA 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
Roua Mines, Daluis, Nice Arrondissement, Alpes-Maritimes, Provence-Alpes-Côte d'Azur, France