Larsenite Mineral Data

Larsenite Mineral Data +

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General Larsenite Information

Chemical Formula:

PbZnSiO4

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

Empirical Formula:

PbZn(SiO₄)

Environment:

Metamorphosed zinc deposits.

IMA Status:

Valid Species (Pre-IMA) 1928

Locality:

Franklin, New Jersy Link to MinDat.org Location Data.

Name Origin:

Named for Esper Signius Larsen, Jr. (1879-1961), petrologist and Professor of Geology, Harvard University.

Synonym:

ICSD 26840

PDF 20-607

Larsenite Image

Images:

Larsenite

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

Axial Ratios:

a:b:c =0.4347:1:0.2668

Cell Dimensions:

a = 8.244, b = 18.963, c = 5.06, Z = 8; V = 791.03 Den(Calc)= 6.12

Crystal System:

Orthorhombic - DipyramidalH-M Symbol (2/m 2/m 2/m) Space Group: Pnam

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

By Intensity(I/I_o): 3.17(1), 3.01(0.6), 2.83(0.5),

Crystal Structure:

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Prewitt C T , Kirchner E , Preisinger A , Zeitschrift fur Kristallographie , 124 (1967) p.115-130, Crystal structure of larsenite PbZnSiO4, Locality: Franklin, New Jersey, USA

Physical Properties of Larsenite

Cleavage:

[010] Distinct

Color:

White.

Density:

5.9

Diaphaniety:

Transparent

Fracture:

Brittle - Generally displayed by glasses and most non-metallic minerals.

Habit:

Acicular - Occurs as needle-like crystals.

Habit:

Striated - Parallel lines on crystal surface or cleavage face.

Hardness:

3 - Calcite

Luminescence:

Piezoelectric.

Luster:

Adamantine

Magnetism:

Nonmagnetic

Streak:

white

Optical Properties of Larsenite

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

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

Electron Density:

r_electron=5.30 gm/cc
note: r_Larsenite=6.12 gm/cc.

Fermion Index

Fermion Index = 0.1366
Boson Index = 0.8634

Photoelectric:

PE_Larsenite=1,016.78 barns/electron
U=PE_Larsenite x r_electron=5,392.15 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Larsenite is Not Radioactive

Larsenite Classification

Dana Class:

51.2.1.2 (51)Nesosilicate Insular SiO4 Groups Only

(51.2)with cations in [4] as well as >[4]

(51.2.1)Trimerite group

51.2.1.1 Trimerite CaMn2Be3(SiO4)3 P 2₁/c 2/m

51.2.1.2 Larsenite PbZnSiO4 Pnam 2/m 2/m 2/m

51.2.1.3 Esperite PbCa3Zn4(SiO4)4 B21/m 2/m

Strunz Class:

VIII/A.03-30 VIII - Silicates

VIII/A - Nesosilicates, with [SiO4]4- groups, cations of tetrahedric orientation [4]

VIII/A.03 - Trimerite - Larsenite series

VIII/A.03-10 Trimerite CaMn2Be3(SiO4)3 P 2₁/c 2/m

VIII/A.03-20 Esperite PbCa3Zn4(SiO4)4 B21/m 2/m

VIII/A.03-30 Larsenite PbZnSiO4 Pnam 2/m 2/m 2/m

Other Larsenite Information

References:

NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Ford32)

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Larsenite

PbZnSiO4
Dana No: 51.2.1.2 Strunz No: VIII/A.03-30
Locality:

Notes: