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

Environment:

Found on an old mineral specimen.

IMA Status:

Approved IMA 1981

Locality:

Laurani, Oruro, Bolivia. Link to MinDat.org Location Data.

Name Origin:

Named for Franz Lammer, mineral collector of Leoben, Austria, who provided the first specimen.

Name Pronunciation:

Lammerite + Pronunciation

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 - Prismatic H-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),

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
Ncalc = 1.95 - 1.98

Optical Data:

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

Calculated Properties of Lammerite

Electron Density:

Bulk Density (Electron Density)=4.68 gm/cc
note: Specific Gravity of Lammerite =5.02 gm/cc.

Fermion Index:

Fermion Index = 0.0001375977
Boson Index = 0.9998624023

Photoelectric:

PE_Lammerite= 36.95 barns/electron
U=PE_Lammerite x rElectron Density= 172.80 barns/cc.

Radioactivity:

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

Lammerite Classification

Dana Class:

38.03.09.01 (38)Anhydrous Phosphates, etc

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

(38.03.09)Dana Group

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

38.03.09.02 IMA2009-002! Cu3(AsO4)2 P 2₁/c 2/m

Strunz Class:

08.AB.30 08 - PHOSPHATES, ARSENATES, VANADATES

08.A - Phosphates, etc. without additional anions, without H2O

08.AB -With medium-sized cations

08.AB.30 Lammerite Cu3[(As,P)O4]2 P 2₁/a 2/m

Other Lammerite Information

References:

NAME( AntBidBlaNic5) 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 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info
15 - WWW-MINCRYST

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Print or Cut-and-Paste your Lammerite Specimen Label here :

Lammerite

Cu3[(As,P)O4]2
Dana No: 38.03.09.01 Strunz No: 08.AB.30
Locality:

Notes:

Dakota Matrix
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