Lammerite Mineral Data

Lammerite Mineral Data +

General Lammerite Information

Chemical Formula:

Cu3[(As,P)O4]2

Composition:

Molecular Weight = 446.50 gm

Copper 42.70 % Cu 48.07 % Cu₂O

Arsenic 25.17 % As 38.61 % As₂O₅

Phosphorus 3.47 % P 7.95 % P₂O₅

Oxygen 28.67 % O

______ ______

100.00 % 94.63 % = TOTAL OXIDE

Empirical Formula:

Cu₃(AsO₄)_1.5(PO₄)_0.5

IMA Status:

Approved IMA 1981

Locality:

Link to MinDat.org Location Data.

Synonym:

ICSD 201733

PDF 39-385

Lammerite Image

Images:

Lammerite

Comments: Emerald green crystalline lammerite in matrix.
Location: Laurani Mine, South Yeronime, Laurani, La Paz, Bolivia. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Images:

Lammerite

Comments: Deep, lustrous green lammerite crystals to about 1mm throughout vuggy matrix.
Location: Guanaco mine, Taltal, Antofagasta, Chile. Scale: Picture size 1 cm.
© Tom Loomis / Dakota Matrix

Lammerite Crystallography

Axial Ratios:

a:b:c =0.4373:1:0.4641

Cell Dimensions:

a = 5.08, b = 11.616, c = 5.391, Z = 2; beta = 111.71° V = 295.55 Den(Calc)= 5.02

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: P 2₁/a

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

By Intensity(I/I_o): 2.89(1), 2.52(0.9), 3.06(0.8),

Crystal Structure:

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Hawthorne F C , American Mineralogist , 71 (1986) p.206-209, Lammerite, Cu3(AsO4)2, a modulated close-packed structure

Physical Properties of Lammerite

Cleavage:

[010] Good, [100] Indistinct

Color:

Dark green.

Density:

5.18

Hardness:

3-4 - Calcite-Fluorite

Luster:

Adamantine

Streak:

light green

Optical Properties of Lammerite

Gladstone-Dale:

CI meas= 0.058 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= 0.028 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1843,KPDmeas= 0.1786,KC= 0.1896

Optical Data:

Biaxial (+), b=1.9, g=1.95, , 2V(Meas)=54.

Calculated Properties of Lammerite

Electron Density:

r_electron=4.68 gm/cc
note: r_Lammerite=5.02 gm/cc.

Fermion Index

Fermion Index = 0.00013
Boson Index = 0.99987

Photoelectric:

PE_Lammerite= 36.95 barns/electron
U=PE_Lammerite x r_electron= 172.80 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Lammerite is Not Radioactive

Lammerite Classification

Dana Class:

38.3.9.1 (38)Anhydrous Phosphates, etc

(38.3)(A+ B++)3 (XO4)2

(38.3.9)Dana Group

38.3.9.1 Lammerite Cu3[(As,P)O4]2 P 2₁/a 2/m

Strunz Class:

VII/A.09-10 VII - Phosphates, Arsenates and Vanadates

VII/A - Waterfree phosphates [PO4]3- without unfamiliar anions, cations of medium and big size: Mg, Mn,Fe, Cu, Zn, and Ca, Na

VII/A.09 - Lammerite - Xanthiosite series

VII/A.09-10 Lammerite Cu3[(As,P)O4]2 P 2₁/a 2/m

VII/A.09-20 Stranskiite Zn2Cu(AsO4)2 P1 1

VII/A.09-30 Keyite Cu3(Zn,Cu)4Cd2(AsO4)6·2(H2O) I2/a 2/m

VII/A.09-40 Xanthiosite Ni3(AsO4)2 P 2₁/a 2/m

Other Lammerite Information

References:

PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Lammerite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - EUROmin Project 4 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 - WWW-MINCRYST 13 -École des Mines de Paris

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Lammerite

Cu3[(As,P)O4]2
Dana No: 38.3.9.1 Strunz No: VII/A.09-10
Locality:

Notes: