Joesmithite Mineral Data + 
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- 66.1.4.1 Joesmithite PbCa2(Mg,Fe,Fe)5Si6Be2O22(OH)2 P 2/a 2/m
- VIII/F.11-10 Joesmithite PbCa2(Mg,Fe,Fe)5Si6Be2O22(OH)2 P 2/a 2/m
General Joesmithite Information |
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 Chemical Formula: |
PbCa2(Mg,Fe++,Fe+++)5Si6Be2O22(OH)2 | ||
| Composition: |
Molecular Weight = 1,043.42 gm | ||
| Calcium 7.30 % Ca 10.21 % CaO | |||
| Magnesium 5.82 % Mg 9.66 % MgO | |||
| Manganese 1.58 % Mn 2.04 % MnO | |||
| Beryllium 1.55 % Be 4.31 % BeO | |||
| Iron 10.70 % Fe 2.75 % FeO / 12.24 % Fe2O3 | |||
| Silicon 16.15 % Si 34.55 % SiO2 | |||
| Hydrogen 0.17 % H 1.55 % H2O | |||
| Lead 19.86 % Pb 20.62 % Pb2O | |||
| Oxygen 36.49 % O | |||
| Fluorine 0.36 % F 0.36 % F | |||
| - % F -0.15 % -O=F2 | |||
| ______ ______ | |||
| 100.00 % 98.16 % = TOTAL OXIDE | |||
| Empirical Formula: |
PbCa1.9Mg2.5Fe3+1.6Fe2+0.4Mn2+0.3Si6Be1.8O22(OH)1.8F0.2 | ||
| Environment: |
Metamorphosed manganese ores. | ||
| IMA Status: |
Approved IMA 1968 | ||
| Locality: |
At Lanban, Varmalnd, Sweden. Link to MinDat.org Location Data. | ||
| Name Origin: |
Named for Prof. Joseph Victor Smith (1928-), English-American mineralogist and petrologist of the University of Chicago, Chicago, Illinois, USA. | ||
| Synonym: |
ICSD 74285 | ||
| PDF 22-531 | |||
Search for Joesmithite Images | |||
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Images:
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Joesmithite Crystallography |
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| Axial Ratios: |
a:b:c =0.5528:1:0.2925 | ||
| Cell Dimensions: |
a = 9.88, b = 17.87, c = 5.227, Z = 2; beta = 105.67° V = 888.56 Den(Calc)= 3.90 | ||
| Crystal System: |
Monoclinic - PrismaticH-M Symbol (2/m) Space Group: P 2/a | ||
| X Ray Diffraction: |
By Intensity(I/Io): 3.33(1), 2.53(0.6), 2.564(0.6), | ||
Physical Properties of Joesmithite |
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| Cleavage: |
[110] Perfect | ||
| Color: |
Black. | ||
| Density: |
3.83 | ||
| Diaphaniety: |
Transparent to Translucent | ||
| Habit: |
Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline). | ||
| Hardness: |
5.5 - Knife Blade | ||
| Luster: |
Subadamantine | ||
| Streak: |
light brown | ||
Optical Properties of Joesmithite |
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| Gladstone-Dale: |
CI meas= -0.166 (Poor) - where the CI = (1-KPDmeas/KC) CI calc= -0.145 (Poor) - where the CI = (1-KPDcalc/KC) KPDcalc= 0.1959,KPDmeas= 0.1995,KC= 0.171 |
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| Optical Data: |
Biaxial (+), a=1.747, b=1.765, g=1.78, bire=0.0330, 2V(Calc)=84, 2V(Meas)=60-70. | ||
| Pleochroism (x): |
Olive. | ||
| Pleochroism (y): |
olive brown. | ||
| Pleochroism (z): |
Olive. | ||
Calculated Properties of Joesmithite |
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| Electron Density: |
relectron=3.70 gm/cc |
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| Fermion Index |
Fermion Index = 0.07534 Boson Index = 0.92466 |
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| Photoelectric: |
PEJoesmithite = 326.93 barns/electron |
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Joesmithite is Not Radioactive |
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Joesmithite Classification |
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| Dana Class: |
66.1.4.1 (66)Inosilicate Double-Width Unbranched Chains, W=2 | ||
| (66.1)Dana Type | |||
| (66.1.4)Dana Group | |||
| Strunz Class: |
VIII/F.11-10 VIII - Silicates | ||
| VIII/F - Inosilicates (chain and band) double chains [Si4O11]6-, Pb-Ca-Amphiboles | |||
| VIII/F.11 - Amphibole group, Joesmithite series | |||
Other Joesmithite Information |
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| References: |
NAME( AntBidBlaNic2) PHYS. PROP.(AntBidBlaNic2) OPTIC PROP.(AntBidBlaNic2) | ||
| See Also: |
Links to other databases for Joesmithite : 1 -Am. Min. Crystal Structure Database 2 -Athena 3 - EUROmin Project 4 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (MinSocAm) 7 -Handbook of Mineralogy (UofA) 8 -MinDAT 9 -MinMax(Deutsch) 10 -MinMax(English) 11 -Mineralienatlas (Deutsch) 12 -QUT Mineral Atlas 13 - WWW-MINCRYST 14 -École des Mines de Paris Search for Joesmithite using: Visit our Advertisers for Joesmithite : Translate Joesmithite Mineral Data : Ask about Joesmithite here : Print or Cut-and-Paste your Joesmithite Specimen Label here :
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