Mineralogy Database

Lammerite Mineral Data

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General Lammerite Information

Help on Chemical  Formula: Chemical Formula: Cu3[(As,P)O4]2
Help on Composition: 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
Help on Empirical Formula: Empirical Formula: Cu3(AsO4)1.5(PO4)0.5
Help on Environment: Environment: Found on an old mineral specimen.
Help on IMA Status: IMA Status: Approved IMA 1981
Help on Locality: Locality: Laurani, Oruro, Bolivia. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Franz Lammer, mineral collector of Leoben, Austria, who provided the first specimen.
Help on Name Pronunciation: Name Pronunciation: Lammerite + Pronunciation Say LAMMERITE
Help on Synonym: Synonym: ICSD 201733
  PDF 39-385

Lammerite Image

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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

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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

Help on Axial Ratios: Axial Ratios: a:b:c =0.4373:1:0.4641
Help on Cell Dimensions: Cell Dimensions: a = 5.08, b = 11.616, c = 5.391, Z = 2; beta = 111.71° V = 295.55 Den(Calc)= 5.02
Help on Crystal System: 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/Io): 2.89(1), 2.52(0.9), 3.06(0.8),

Physical Properties of Lammerite

Help on Cleavage: Cleavage: {010} Good, {100} Indistinct
Help on Color: Color: Dark green.
Help on Density: Density: 5.18
Help on Hardness: Hardness: 3-4 - Calcite-Fluorite
Help on Luster: Luster: Adamantine
Help on Streak: Streak: light green

Optical Properties of Lammerite

Help on Gladstone-Dale: 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
Help on Optical Data: Optical Data: Biaxial (+), b=1.9, g=1.95, , 2V(Meas)=54.

Calculated Properties of Lammerite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=4.68 gm/cc
note: Specific Gravity of Lammerite =5.02 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0001375977
Boson Index = 0.9998624023
Help on Photoelectric: Photoelectric: PELammerite = 36.95 barns/electron
U=PELammerite x rElectron Density= 172.80 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Lammerite is Not Radioactive

Lammerite Classification

Help on  Dana Class: Dana Class: (38)Anhydrous Phosphates, etc
  (38.03)(A+ B++)3 (XO4)2
  (38.03.09)Dana Group Lammerite Cu3[(As,P)O4]2 P 21/a 2/m IMA2009-002! Cu3(AsO4)2 P 21/c 2/m
Help on  Strunz Class: 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

Help on References: References: NAME( AntBidBlaNic5) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: 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

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Dana No: Strunz No: 08.AB.30





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