Esperite Mineral Data + 
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- 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
- 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
General Esperite Information |
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 Chemical Formula: |
PbCa3Zn4(SiO4)4 | ||
| 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 | |||
| Empirical Formula: |
PbCa3Zn4(SiO4)4 | ||
| Environment: |
Metamorphosed zinc deposits associated with larsenite. | ||
| IMA Status: |
Approved IMA 1965 | ||
| Locality: |
Franklin, Sussex Co., New Jersey, USA. Link to MinDat.org Location Data. | ||
| Name Origin: |
Named for Esper Signius Larsen, Jr. (1879-1961), petrologist and Professor of Geology, Harvard University. | ||
| Synonym: |
Calcium larsenite | ||
Esperite Image | |||
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Images:
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Esperite Crystallography |
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| Axial Ratios: |
a:b:c =2.1318:1:3.6904 | ||
| Cell Dimensions: |
a = 17.63, b = 8.27, c = 30.52, Z = 12; beta = 90° V = 4,449.82 Den(Calc)= 4.29 | ||
| Crystal System: |
Monoclinic - PrismaticH-M Symbol (2/m) Space Group: B21/m | ||
| X Ray Diffraction: |
By Intensity(I/Io): 3.017(1), 2.534(0.75), 7.62(0.45), | ||
Physical Properties of Esperite |
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| Cleavage: |
[???] Indistinct | ||
| Color: |
White. | ||
| Density: |
4.421 | ||
| Diaphaniety: |
Subtranslucent to opaque | ||
| Fracture: |
Brittle - Generally displayed by glasses and most non-metallic minerals. | ||
| Habit: |
Massive - Uniformly indistinguishable crystals forming large masses. | ||
| Hardness: |
5 - Apatite | ||
| Luminescence: |
Fluorescent. | ||
| Luster: |
Vitreous (Glassy) | ||
| Streak: |
white | ||
Optical Properties of Esperite |
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| 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 |
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| Optical Data: |
Biaxial (-), a=1.762, b=1.77, g=1.774, bire=0.0120 | ||
| Pleochroism (x): |
colorless. | ||
| Pleochroism (y): |
colorless. | ||
| Pleochroism (z): |
colorless. | ||
Calculated Properties of Esperite |
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| Electron Density: |
relectron=4.12 gm/cc |
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| Fermion Index |
Fermion Index = 0.06481 Boson Index = 0.93519 |
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| Photoelectric: |
PEEsperite = 372.72 barns/electron |
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Esperite is Not Radioactive |
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Esperite Classification |
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| Dana Class: |
51.2.1.3 (51)Nesosilicate Insular SiO4 Groups Only | ||
| (51.2)with cations in [4] as well as >[4] | |||
| (51.2.1)Trimerite group | |||
| Strunz Class: |
VIII/A.03-20 VIII - Silicates | ||
| VIII/A - Nesosilicates, with [SiO4]4- groups, cations of tetrahedric orientation [4] | |||
| VIII/A.03 - Trimerite - Larsenite series | |||
Other Esperite Information |
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| References: |
NAME( Ford32) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990) | ||
| 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 - Franklin Minerals(Dunn) 6 -Google Images 7 -Google Scholar 8 -Handbook of Mineralogy (MinSocAm) 9 -Handbook of Mineralogy (UofA) 10 -MinDAT 11 -MinMax(Deutsch) 12 -MinMax(English) 13 -Mineralienatlas (Deutsch) 14 -QUT Mineral Atlas 15 -École des Mines de Paris Search for Esperite using: Visit our Advertisers for Esperite : Translate Esperite Mineral Data : Ask about Esperite here : Print or Cut-and-Paste your Esperite Specimen Label here :
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