Joesmithite Mineral Data

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General Joesmithite Information

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:

PbCa_1.9Mg_2.5Fe³⁺_1.6Fe²⁺_0.4Mn²⁺_0.3Si₆Be_1.8O₂₂(OH)_1.8F_0.2

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.

Name Pronunciation:

Joesmithite + Pronunciation

Synonym:

ICSD 74285

PDF 22-531

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Joesmithite Crystallography

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

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

By Intensity(I/I_o): 3.33(1), 2.53(0.6), 2.564(0.6),

Crystal Structure:

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Moore P B , Davis A M , Van Derveer D G , Sen Gutpa P K , Mineralogy and Petrology , 48 (1993) p.97-113, Joesmithite, a plumbous amphibole revisited and comments on bond valences

Physical Properties of Joesmithite

Cleavage:

{110} Perfect

Color:

Black.

Density:

3.83

Diaphaneity:

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

Gladstone-Dale:

CI meas= -0.132 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.112 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1959,KPDmeas= 0.1995,KC= 0.1762
Ncalc = 1.67 - 1.69

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

Electron Density:

Bulk Density (Electron Density)=3.70 gm/cc
note: Specific Gravity of Joesmithite =3.90 gm/cc.

Fermion Index:

Fermion Index = 0.07
Boson Index = 0.93

Photoelectric:

PE_Joesmithite= 326.93 barns/electron
U=PE_Joesmithite x rElectron Density=1,209.00 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Joesmithite is Not Radioactive

Joesmithite Classification

Dana Class:

66.01.04.01 (66)Inosilicate Double-Width Unbranched Chains, W=2

(66.01)with P=2 amphibole configuration

(66.01.04)Dana Group

66.01.04.01 Joesmithite PbCa2(Mg,Fe,Fe)5Si6Be2O22(OH)2 P 2/a 2/m

Strunz Class:

09.DE.10 09 - SILICATES (Germanates)

09.D - Inosilicates* Structural terminology according to Liebau (1985)

09.DE -Inosilicates with 2-periodic double chains, Si4O11; amphibole family

09.DE.10 Ferritschermakite Ca2(Fe,Mg)3Al2(Si7Al)O22(OH)2 C 2/m 2/m

09.DE.10 Ferro-actinolite []Ca2Fe5Si8O22(OH)2 C 2/m 2/m

09.DE.10 Aluminoferrotschermakite! []Ca2(Fe2)3Al2(Si6Al2)O22(OH)2 C 2/m 2/m

09.DE.10 Edenite NaCa2Mg5Si7AlO22(OH)2 C 2/m 2/m

09.DE.10 Ferri-ferrotschermakite! []Ca2(Fe2)3(Fe3)2(Si6Al2)O22(OH)2 C 2/m 2/m

09.DE.10 Actinolite Ca2(Mg,Fe)5Si8O22(OH)2 C 2/m 2/m

09.DE.10 Cannilloite! CaCa2Mg4Al(Si5Al3)O22(OH)2 C 2/m 2/m

09.DE.10 Fluorocannilloite! CaCa2(Mg4Al)Si5Al3O22F2 C 2/m 2/m

09.DE.10 Ferrohornblende []Ca2[Fe4(Al,Fe)]Si7AlO22(OH)2 C 2/m 2/m

09.DE.10 Ferrokaersutite NaCa2(Fe4Ti)Si6Al2O22(OH)2 C 2/m 2/m

09.DE.10 Ferro-edenite NaCa2Fe5Si7AlO22(OH)2 C 2/m 2/m

09.DE.10 Ferro-aluminotschermakite* Ca2Fe3Al2(Si7Al)O22(OH)2 C 2/m 2/m

09.DE.10 Potassic-magnesiosadanagaite (K,Na)Ca2(Mg,Fe,Al,Ti)5[(Si,Al)8O22](OH)2 C 2,Cm,C 2/m Mono

09.DE.10 Fluoro-edenite! NaCa2Mg5Si7AlO22(F,OH)2 C 2/m 2/m

09.DE.10 Hastingsite NaCa2(Fe4Fe)Si6Al2O22(OH)2 C 2/m 2/m

09.DE.10 Ferrotschermakite! []Ca2(Fe3AlFe)Si6Al2O22(OH) C 2/m 2/m

09.DE.10 Ferroferritschermakite* Ca2(Fe,Mg)3Fe2(Si7Al)O22(OH)2 C 2/m 2/m

09.DE.10 Ferropargasite NaCa2(Fe4Al)Si6Al2O22(OH)2 C 2/m 2/m

09.DE.10 Joesmithite PbCa2(Mg,Fe,Fe)5Si6Be2O22(OH)2 P 2/a 2/m

09.DE.10 Kaersutite NaCa2(Mg4Ti)Si6Al2O23(OH)2 C 2/m 2/m

09.DE.10 Magnesiohastingsite NaCa2(Mg4Fe)Si6Al2O22(OH)2 C 2/m 2/m

09.DE.10 Magnesiohornblende Ca2[Mg4(Al,Fe)]Si7AlO22(OH)2 C 2/m 2/m

09.DE.10 Pargasite NaCa2(Mg,Fe)4Al(Si6Al2)O22(OH)2 C 2/m 2/m

09.DE.10 Potassicsadanagaite! (K,Na)Ca2[Fe3(Al,Fe)2][Si5Al3O22](OH)2 C 2,Cm,C 2/m Mono

09.DE.10 Potassicpargasite! (K,Na)Ca2(Mg,Fe)5Si8O22(OH,F)2 C 2/m 2/m

09.DE.10 Sadanagaite (K,Na)Ca2(Fe,Mg,Al,Ti)5[(Si,Al)8O22](OH)2 C 2,Cm,C 2/m Mono

09.DE.10 Tschermakite []Ca2(Mg3AlFe)Si6Al2O22(OH)2 C 2/m 2/m

09.DE.10 Tremolite []Ca2Mg5Si8O22(OH)2 C 2/m 2/m

09.DE.10 Fluoro-magnesiohastingsite! (Na,K)Ca2(Mg,Fe,Ti)5(Si,Al)8O22F2 C 2/m 2/m

09.DE.10 Parvo-manganotremolite! [](CaMn)2Mg5(Si7Al)O22(OH)2 C 2/m 2/m

09.DE.10 Fluoropargasite! NaCa2(Mg3FeAl)5(Si6Al2O22)F2 C 2/m 2/m

09.DE.10 Parvo-mangano-edenite! Na(CaMn)2Mg5(Si7Al)O22(OH)2 C 2/m 2/m

09.DE.10 Magnesiosadanagaite! NaCa2[Mg3(Al,Fe)2]Si5AlO22(OH)2 C 2/m 2/m

09.DE.10 Fluoro-potassichastingsite! KCa2(Fe2,Mg2,Fe)S5(Si6Al2)8O22F2 C 2/m 2/m

09.DE.10 Chloro-potassichastingsite! KCa2(Fe3MgFe)(Si6Al2)S8O22Cl2 C 2/m 2/m

09.DE.10 Potassic-magnesiohastingsite! (K,Na)Ca2(Mg,Fe,Fe,Al)5(Si,Al)8O22(OH,Cl)2 C 2/m 2/m

09.DE.10 Potassic-ferropargasite KCa2(Fe4Al)Si6Al2O22(OH)2 C 2/m 2/m

Other Joesmithite Information

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 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info
15 - WWW-MINCRYST

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Joesmithite

PbCa2(Mg,Fe++,Fe+++)5Si6Be2O22(OH)2
Dana No: 66.01.04.01 Strunz No: 09.DE.10
Locality:

Notes: