Lapeyreite Mineral Data

General Lapeyreite Information

Chemical Formula:

Cu3O[AsO3(OH)]2•H2O

Composition:

Molecular Weight = 504.51 gm

Copper 37.79 % Cu 47.30 % CuO

Arsenic 29.70 % As 45.56 % As₂O₅

Hydrogen 0.80 % H 7.14 % H₂O

Oxygen 31.71 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Cu₃O(AsO₃OH)₂•(H₂O)

Environment:

Related to theoparacelsite

IMA Status:

Proposed IMA 2008 (Dana # Added)

Locality:

Roua, Dôme de Barrot, Departement Alpes-Maritimes, France Link to MinDat.org Location Data.

Name Origin:

Commission on New Minerals, Nomenclature and Classification (CNMNC)

Synonym:

IMA2003-023b

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Lapeyreite Crystallography

Axial Ratios:

a:b:c =6.5249:1:3.131

Cell Dimensions:

a = 19.158, b = 2.9361, c = 9.193, Z = 2; beta = 103.26° V = 503.32 Den(Calc)= 3.33

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: C 2/m

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 2.984(1), 3.173(0.9), 2.484(0.8),2.396(0.4), 5.842(0.4), 2.337(0.35), 4.476(0.35), 7.36(0.3),

Optical Properties of Lapeyreite

Optical Data:

NCalc= 1.59 - from Gladstone-Dale relationship (KC = 0.1785) where Ncalc=Dcalc*KC+1

Calculated Properties of Lapeyreite

Electron Density:

Bulk Density (Electron Density)=3.13 gm/cc
note: Specific Gravity of Lapeyreite =3.33 gm/cc.

Fermion Index:

Fermion Index = 0.0001534208
Boson Index = 0.9998465792

Photoelectric:

PE_Lapeyreite= 37.42 barns/electron
U=PE_Lapeyreite x rElectron Density= 117.07 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Lapeyreite is Not Radioactive

Lapeyreite Classification

Dana Class:

41.03.01.03 (41)Anhydrous Phosphates, etc. Containing Hydroxyl or Halogen

(41.03)where (A B)3 (XO4) Zq

(41.03.01)Clinoclase Group

41.03.01.01 Clinoclase Cu3(AsO4)(OH)3 P 2₁/a 2/m

41.03.01.02 Gilmarite! Cu3(AsO4)(OH)3 P1 1

41.03.01.03 Lapeyreite! Cu3O[AsO3(OH)]2•H2O C 2/m 2/m

Strunz Class:

08.XX.00 08 - PHOSPHATES, ARSENATES, VANADATES

08.X - Unclassified Strunz PHOSPHATES, ARSENATES, VANADATES

08.XX -Arsenites, Basic

08.XX.00 Arsenobismite? Bi2(AsO4)(OH)3 Unk Ortho

08.XX.00 Coeruleolactite (Ca,Cu)Al6(PO4)4(OH)8•4-5(H2O) P1 1

08.XX.00 Cheralite-(Ce)? (Ce,Ca,Th)(P,Si)O4 P 2₁/n 2/m

08.XX.00 Chernovite-(Ce)* (Ce,Y)(AsO4) I 4₁/amd 4/m 2/m 2/m

08.XX.00 Kerstenite? PbSeO4(?) P nma 2/m 2/m 2/m

08.XX.00 Laubmannite? Fe3Fe6(PO4)4(OH)12 Unk Ortho

08.XX.00 Spodiosite? Ca2(PO4)F Pbcm 2/m 2/m 2/m

08.XX.00 Pseudo-autunite* (H3O)4Ca2(UO2)2(PO4)4•5(H2O)(?) Unk Ortho

08.XX.00 Viseite Ca10Al24(SiO4)6(PO4)7O22F3•72(H2O)(?) I a3d 4/m 3 2/m

08.XX.00 Vanuranylite? (H3O,Ba,Ca,K)1.6(UO2)2V2O8•4(H2O)(?) C 2/c ? 2/m

08.XX.00 Sodium-autunite Na2(UO2)2(PO4)2•8(H2O) P 4/nmm 4/m 2/m 2/m

08.XX.00 Sodium meta-autunite! Na2(UO2)2(PO4)2•6-8(H2O) P 4/nmm 4/m 2/m 2/m

08.XX.00 Slavkovite! Cu13(AsO4)6(AsO3OH)4•23(H2O) P1 1

08.XX.00 IMA2000-020! Fe4[AsO3OH]5[AsO2(OH)2]2•20(H2O) Ortho Ortho

08.XX.00 Lewisite! (Ca,Fe,Na)2(Sb,Ti)2O7 F d3m 4/m 3 2/m

08.XX.00 Kamarizaite! Fe3(AsO4)2(OH)3•3H2O Pccm, Pcc2, Pcmm, Pcm21 Ortho

08.XX.00 Lapeyreite! Cu3O[AsO3(OH)]2•H2O C 2/m 2/m

08.XX.00 IMA2008-063 Pb[Zn0.25,[]0.75]Fe3H(AsO4)2(OH)6 C 2/c 2/m

08.XX.00 IMA2009-002! Cu3(AsO4)2 P 2₁/c 2/m

08.XX.00 IMA2009-005 (Y,Ca,REE)5[(Si,P)O4]3F P 6₃/m 6/m 2/m 2/m

08.XX.00 IMA2009-016 Cu4H(AsO4)2(OH)3•H2O P1 1

Other Lapeyreite Information

See Also:

Links to other databases for Lapeyreite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - MinDAT
7 - Mineralienatlas (Deutsch)
8 - Online Mineral Museum
9 - QUT Mineral Atlas
10 - Ruff.Info

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Lapeyreite

Cu3O[AsO3(OH)]2•H2O
Dana No: 41.03.01.03 Strunz No: 08.XX.00
Locality:

Notes: