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Lapeyreite

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About LapeyreiteHide

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, an eminent mineral collector and expert on Roua minerals.
Related to theoparacelsite.


Classification of LapeyreiteHide

Approved
Approval Year:
2008

Physical Properties of LapeyreiteHide

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}.
Fracture:
Conchoidal
Density:
4.385 g/cm3 (Calculated)

Optical Data of LapeyreiteHide

Type:
Biaxial (+)
Dispersion:
r > v, medium
Pleochroism:
Strong
Comments:
X = light yellow-green, Y = pistachio-green, Z = dark pistachio-green

Chemical Properties of LapeyreiteHide

Formula:
Cu3O[AsO3(OH)]2 · 0.75H2O
IMA Formula:
Cu3O[AsO3(OH)]2 · H2O
Idealised Formula:
Cu3O[AsO3(OH)]2 · 1H2O

Crystallography of LapeyreiteHide

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
B2/m
Cell Parameters:
a = 19.158 Å, b = 2.9361 Å, c = 9.193 Å
β = 103.26°
Ratio:
a:b:c = 6.525 : 1 : 3.131
Unit Cell V:
503.32 ų (Calculated from Unit Cell)
Morphology:
Forms: {100}, {010}, and {001}.
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.

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
7.36 (30)
5.842 (40)
4.476 (35)
3.173 (90)
2.984 (100)
2.484 (80)
2.396 (40)
2.337 (35)

Type Occurrence of LapeyreiteHide

General Appearance of Type Material:
As aggregates in geodes of cuprite (0.5 mm diameter), invariably in intimate association with trippkeite
Associated Minerals at Type Locality:

Synonyms of LapeyreiteHide

Other InformationHide

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for LapeyreiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Proposals approved in September 2008
Sarp, H., Mari, G., Mari, D., Rolland, P., Lapeyre, L. (2000): Gilmarite, rollandite, théoparacelsite, radovanite, nouvelles espèces minérales de Roua (Daluis de Guillaumes, Alpes-Maritimes, France). Riviéra Scientifique, 84, 19-24. [preliminary data]
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.

Internet Links for LapeyreiteHide

Localities for LapeyreiteHide

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for 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 (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
France (TL)
 
  • Provence-Alpes-Côte d'Azur
    • Alpes-Maritimes
      • Guillaumes
        • Daluis
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.
Mineral and/or Locality  
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