Mineralogy Database

Larsenite Mineral Data

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General Larsenite Information

Help on Chemical  Formula: Chemical Formula: PbZnSiO4
Help on Composition: Composition: Molecular Weight = 364.67 gm
   Zinc     17.93 %  Zn   22.32 % ZnO
   Silicon   7.70 %  Si   16.48 % SiO2
   Lead     56.82 %  Pb   61.21 % PbO
   Oxygen   17.55 %  O
           ______        ______ 
           100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: PbZn(SiO4)
Help on Environment: Environment: Metamorphosed zinc deposits.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1928
Help on Locality: Locality: Franklin, New Jersy Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Esper Signius Larsen, Jr. (1879-1961), petrologist and Professor of Geology, Harvard University.
Help on Name Pronunciation: Name Pronunciation: Larsenite + Pronunciation Say LARSENITE
Help on Synonym: Synonym: ICSD 26840
  PDF 20-607

Larsenite Image

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Comments: Aggregate of acicular microcrystals and crystalline larsenite.
Location: Franklin, Sussex County, New Jersey, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Larsenite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.4347:1:0.2668
Help on Cell Dimensions: Cell Dimensions: a = 8.244, b = 18.963, c = 5.06, Z = 8; V = 791.03 Den(Calc)= 6.12
Help on Crystal System: Crystal System: Orthorhombic - Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: Pnam
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.17(1), 3.01(0.6), 2.83(0.5),

Physical Properties of Larsenite

Help on Cleavage: Cleavage: {010} Distinct
Help on Color: Color: White.
Help on Density: Density: 5.9
Help on Diaphaneity: Diaphaneity: Transparent
Help on Fracture: Fracture: Brittle - Generally displayed by glasses and most non-metallic minerals.
Help on Habit: Habit: Acicular - Occurs as needle-like crystals.
Help on Habit: Habit: Striated - Parallel lines on crystal surface or cleavage face.
Help on Hardness: Hardness: 3 - Calcite
Help on Luminescence: Luminescence: Piezoelectric.
Help on Luster: Luster: Adamantine
Help on Magnetism: Magnetism: Nonmagnetic
Help on Streak: Streak: white

Optical Properties of Larsenite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.059 (Fair) - where the CI = (1-KPDmeas/KC)
CI calc= -0.021 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1541,KPDmeas= 0.1599,KC= 0.1509
Ncalc = 1.89 - 1.92
Help on Optical Data: Optical Data: Biaxial (-), a=1.92, b=1.95, g=1.96, bire=0.0400, 2V(Calc)=58, 2V(Meas)=80. Dispersion r > v.

Calculated Properties of Larsenite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=5.30 gm/cc
note: Specific Gravity of Larsenite =6.12 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.13
Boson Index = 0.87
Help on Photoelectric: Photoelectric: PELarsenite =1,016.78 barns/electron
U=PELarsenite x rElectron Density=5,392.15 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Larsenite is Not Radioactive

Larsenite Classification

Help on  Dana Class: Dana Class: (51)Nesosilicate Insular SiO4 Groups Only
  (51.02)with cations in [4] as well as >[4]
  (51.02.01)Trimerite group Trimerite CaMn2Be3(SiO4)3 P 21/c 2/m Larsenite PbZnSiO4 Pnam 2/m 2/m 2/m Esperite PbCa3Zn4(SiO4)4 B21/m 2/m
Help on  Strunz Class: Strunz Class: 09.AB.10 09 - SILICATES (Germanates)
  09.A - Nesosilicates
  09.AB -Nesosilicates without additional anions;
09.AB.10 Larsenite PbZnSiO4 Pnam 2/m 2/m 2/m

Other Larsenite Information

Help on References: References: NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Ford32)
Help on See Also: See Also: Links to other databases for Larsenite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - Franklin Minerals(Dunn)
6 - Franklin Minerals(Palache)
7 - GeoScienceWorld
8 - Google Images
9 - Google Scholar
10 - Handbook of Mineralogy (MinSocAm)
11 - Handbook of Mineralogy (UofA)
12 - MinDAT
13 - Mineralienatlas (Deutsch)
14 - Online Mineral Museum
15 - QUT Mineral Atlas
16 - Ruff.Info

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Dana No: Strunz No: 09.AB.10





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