Mineralogy Database

Esperite Mineral Data

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General Esperite Information

Help on Chemical  Formula: Chemical Formula: PbCa3Zn4(SiO4)4
Help on Composition: Composition: Molecular Weight = 957.33 gm
   Calcium  12.56 %  Ca   17.57 % CaO
   Zinc     27.32 %  Zn   34.01 % ZnO
   Silicon  11.73 %  Si   25.11 % SiO2
   Lead     21.64 %  Pb   23.31 % PbO
   Oxygen   26.74 %  O
           ______        ______ 
           100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: PbCa3Zn4(SiO4)4
Help on Environment: Environment: Metamorphosed zinc deposits associated with larsenite.
Help on IMA Status: IMA Status: Approved IMA 1965
Help on Locality: Locality: Franklin, Sussex Co., New Jersey, USA. 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: Esperite Say ESPERITE
Help on Synonym: Synonym: Calcium larsenite

Esperite Image

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  Esperite   Hardystonite   Franklinite

Comments: Pale brown porcelaneous esperite with pinkish gray hardystonite and black franklinite.
Location: Franklin, Sussex County, New Jersey. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Esperite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =2.1318:1:3.6904
Help on Cell Dimensions: Cell Dimensions: a = 17.63, b = 8.27, c = 30.52, Z = 12; beta = 90° V = 4,449.82 Den(Calc)= 4.29
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: B21/m
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.017(1), 2.534(0.75), 7.62(0.45),

Physical Properties of Esperite

Help on Cleavage: Cleavage: {???} Indistinct
Help on Color: Color: White.
Help on Density: Density: 4.421
Help on Diaphaneity: Diaphaneity: Subtranslucent to opaque
Help on Fracture: Fracture: Brittle - Generally displayed by glasses and most non-metallic minerals.
Help on Habit: Habit: Massive - Uniformly indistinguishable crystals forming large masses.
Help on Hardness: Hardness: 5 - Apatite
Help on Luminescence: Luminescence: Fluorescent, Short UV=bright lemon yellow.
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: white

Optical Properties of Esperite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= -0.031 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1792,KPDmeas= 0.1739,KC= 0.1739
Ncalc = 1.75 - 1.77
Help on Optical Data: Optical Data: Biaxial (-), a=1.762, b=1.77, g=1.774, bire=0.0120
Help on Pleochroism (x): Pleochroism (x): colorless.
Help on Pleochroism (y): Pleochroism (y): colorless.
Help on Pleochroism (z): Pleochroism (z): colorless.

Calculated Properties of Esperite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=4.12 gm/cc
note: Specific Gravity of Esperite =4.42 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.06
Boson Index = 0.94
Help on Photoelectric: Photoelectric: PEEsperite = 372.72 barns/electron
U=PEEsperite x rElectron Density=1,535.36 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Esperite is Not Radioactive

Esperite 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.15 09 - SILICATES (Germanates)
  09.A - Nesosilicates
  09.AB -Nesosilicates without additional anions;
09.AB.15 Esperite PbCa3Zn4(SiO4)4 B21/m 2/m

Other Esperite Information

Help on References: References: NAME( Ford32) 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 Esperite :
1 - Am. Min. Crystal Structure Database
2 - Amethyst Galleries' Mineral Gallery
3 - Athena
4 - EUROmin Project
5 - Ecole des Mines de Paris
6 - Franklin Minerals(Dunn)
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.15





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