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
GUID
(UUID V4):
(UUID V4):
46bb123d-5a14-48a0-8886-e74d9a07836f
IMA Classification of Lapeyreite
Approved
IMA Formula:
Cu3O[AsO3(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 |
---|---|---|
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 = 1.820 nβ = 1.850 nγ = 1.900
2V:
Measured: 76° , Calculated: 77°
Max Birefringence:
δ = 0.080
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
and does not take into account mineral colouration.
Surface Relief:
Very High
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
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
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Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
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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:
Reference:
Sarp, H., Černy, R., Babalik, H., Hatipoğlu, M., Mari, G. (2010): Lapeyreite, Cu3O[AsO3(OH)]2·0.75H2O, a new mineral: its description and crystal structure. American Mineralogist, 95, 171-176.
Synonyms of Lapeyreite
Common Associates
Related Minerals - Strunz-mindat Grouping
8.DB. | Arangasite | Al2F(PO4)(SO4) · 9H2O |
8.DB. | Camaronesite | [Fe3+(H2O)2(PO3OH)]2(SO4) · 1-2H2O |
8.DB. | Höslite | Fe3+3(VO4)2(SO4)(OH)(H2O)4 · 3H2O |
8.DB.05 | Diadochite | Fe3+2(PO4)(SO4)(OH) · 6H2O |
8.DB.05 | Pitticite | (Fe, AsO4, H2O) (?) |
8.DB.05 | Destinezite | 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 | Flurlite | Zn3Mn2+Fe3+(PO4)3(OH)2 · 9H2O |
8.DB.40 | Manganflurlite | ZnMn2+3Fe3+(PO4)3(OH)2(H2O)7 · 2H2O |
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 | Giniite | Fe2+Fe3+4(PO4)3(OH)5 · 2H2O |
8.DB.50 | Rossiantonite | Al3(PO4)(SO4)2(OH)2(H2O)14 |
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
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).
Struck out - Mineral was erroneously reported from this locality.
Faded * - Never found at this locality but inferred to have existed at some point in the past (e.g. from pseudomorphs).
All localities listed without proper references should be considered as questionable.
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 SynonymsCommon AssociatesStrunz-MindatFluorescence Other InformationInternet Links References Localities Locality List
Roua Mines, Daluis, Nice, Alpes-Maritimes, Provence-Alpes-Côte d'Azur, France