Monimolite Mineral Data

General Monimolite Information

Chemical Formula:

(Pb,Ca)2Sb2O7

Composition:

Molecular Weight = 644.55 gm

Calcium 4.66 % Ca 6.53 % CaO

Antimony 37.78 % Sb 45.22 % Sb₂O₃

Lead 40.18 % Pb 43.29 % PbO

Oxygen 17.38 % O

______ ______

100.00 % 95.04 % = TOTAL OXIDE

Empirical Formula:

Pb_1.25Ca_0.75Sb₂O₇

IMA Status:

Valid Species (Pre-IMA) 1865

Locality:

Harstig mine, Varmland, Sweden. Link to MinDat.org Location Data.

Name Origin:

Named from the Greek for "stable," because it decomposed chemically with great difficulty.

Name Pronunciation:

Monimolite + Pronunciation

Monimolite Image

Images:

Monimolite

Comments: Pale green monimolite crusts on matrix.
Location: Altar, Sonora, Mexico. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Monimolite Crystallography

Cell Dimensions:

a = 10.47, Z = 8; V = 1,147.73 Den(Calc)= 7.46

Crystal System:

Isometric - Hexoctahedral H-M Symbol (4/m 3 2/m) Space Group: F d3m

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

By Intensity(I/I_o): 3.48(1), 2.65(0.4), 5.8(0.3),

Physical Properties of Monimolite

Cleavage:

{111} Indistinct, {111} Indistinct, {111} Indistinct

Color:

Gray green, Yellow, Dark brown, Orange.

Density:

5.94 - 7.29, Average = 6.61

Diaphaneity:

Translucent to Opaque

Fracture:

Conchoidal - Uneven - Uneven fracture producing small, conchoidal fragments.

Habit:

Microscopic Crystals - Crystals visible only with microscopes.

Hardness:

4.5-6

Luster:

Adamantine - Greasy

Streak:

yellow

Optical Properties of Monimolite

Gladstone-Dale:

CI meas= 0.017 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.129 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1421,KPDmeas= 0.1602,KC= 0.1631
Ncalc = 1.97 - 2.22

Optical Data:

Isotropic, n=2.06.

Calculated Properties of Monimolite

Electron Density:

Bulk Density (Electron Density)=5.65 gm/cc
note: Specific Gravity of Monimolite =6.62 gm/cc.

Fermion Index:

Fermion Index = 0.08
Boson Index = 0.92

Photoelectric:

PE_Monimolite= 852.23 barns/electron
U=PE_Monimolite x rElectron Density=4,819.22 barns/cc.

Radioactivity:

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

Monimolite Classification

Dana Class:

44.01.01.04 (44)Antimonates

(44.01)(A)2 (X2 O6) (O,OH,F)

(44.01.01)Stibiconite Group

44.01.01.01 Stibiconite SbSb2O6(OH) F d3m 4/m 3 2/m

44.01.01.02 Bindheimite Pb2Sb2O6(O,OH) F d3m 4/m 3 2/m

44.01.01.03 Romeite (Ca,Fe,Mn,Na)2(Sb,Ti)2O6(O,OH,F) F d3m 4/m 3 2/m

44.01.01.03a Lewisite? (Ca,Fe,Na)2(Sb,Ti)2O7 F d3m 4/m 3 2/m

44.01.01.04 Monimolite (Pb,Ca)2Sb2O7 F d3m 4/m 3 2/m

44.01.01.05 Stetefeldtite Ag2Sb2O6(O,OH) F d3m 4/m 3 2/m

44.01.01.06 Bismutostibiconite Bi(Sb,Fe)2O7 F d3m 4/m 3 2/m

44.01.01.07 Partzite Cu2Sb2(O,OH)7(?) F d3m 4/m 3 2/m

Strunz Class:

04.DH.20 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate

04.D - Metal:Oxygen = 1:2 and similar

04.DH -With large (� medium-sized) cations; sheets of edge-sharing octahedra

04.DH.20 Bismutostibiconite Bi(Sb,Fe)2O7 F d3m 4/m 3 2/m

04.DH.20 Bindheimite Pb2Sb2O6(O,OH) F d3m 4/m 3 2/m

04.DH.20 Monimolite (Pb,Ca)2Sb2O7 F d3m 4/m 3 2/m

04.DH.20 Partzite Cu2Sb2(O,OH)7(?) F d3m 4/m 3 2/m

04.DH.20 Stetefeldtite Ag2Sb2O6(O,OH) F d3m 4/m 3 2/m

04.DH.20 Romeite (Ca,Fe,Mn,Na)2(Sb,Ti)2O6(O,OH,F) F d3m 4/m 3 2/m

04.DH.20 Stibiconite SbSb2O6(OH) F d3m 4/m 3 2/m

Other Monimolite Information

References:

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

See Also:

Links to other databases for Monimolite :
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

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Monimolite

(Pb,Ca)2Sb2O7
Dana No: 44.01.01.04 Strunz No: 04.DH.20
Locality:

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