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Monsmedite Mineral Data

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General Monsmedite Information

Help on Chemical  Formula: Chemical Formula: H8K2Tl2(SO4)8•11(H2O)
Help on Composition: Composition: Molecular Weight = 1,461.70 gm
   Potassium   5.35 %  K     6.44 % K2O
   Thallium   27.97 %  Tl   31.25 % Tl2O3
   Hydrogen    2.07 %  H    18.49 % H2O
   Sulfur     17.55 %  S    43.82 % SO3
   Oxygen     47.07 %  O
             ______        ______ 
             100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: H8K2Tl2(SO4)8•11(H2O)
Help on Environment: Environment: In the oxidation zone of a silver-bearing lead-zinc deposit. Discredited monsmedite=votaite.
Help on IMA Status: IMA Status: Discredited IMA 2002
Help on Locality: Locality: Baia Sprie, Baia Mare region, Romania. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named in 1968 from the Latin 'Mons Medius', for Baia Sprie, Romania, the locality for the mineral.
Help on Name Pronunciation: Name Pronunciation: Monsmedite + Pronunciation Say MONSMEDITE
Help on Synonym: Synonym: Discredited

Monsmedite Crystallography

Help on Cell Dimensions: Cell Dimensions: a = 25.29, Z = 20; V = 16,175.08 Den(Calc)= 3.00
Help on Crystal System: Crystal System: Isometric - Hexoctahedral H-M Symbol (4/m 3 2/m) Space Group: F d3c
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.4(1), 1.57(0.4), 2.08(0.4),2.32(0.4), 3.56(0.4), 2.86(0.4), 3.06(0.1), 5.49(0.1),

Physical Properties of Monsmedite

Help on Cleavage: Cleavage: {???} Good, {???} Good
Help on Color: Color: Dark green, Black.
Help on Density: Density: 3
Help on Diaphaneity: Diaphaneity: Subopaque
Help on Habit: Habit: Euhedral Crystals - Occurs as well-formed crystals showing good external form.
Help on Hardness: Hardness: 2 - Gypsum
Help on Luster: Luster: Resinous
Help on Streak: Streak: dark green

Optical Properties of Monsmedite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.19 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.19 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2018,KPDmeas= 0.2018,KC= 0.1696
Ncalc = 1.51
Help on Optical Data: Optical Data: Biaxial (-), a=1.6, g=1.611, bire=0.0110

Calculated Properties of Monsmedite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.88 gm/cc
note: Specific Gravity of Monsmedite =3.00 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0015516873
Boson Index = 0.9984483127
Help on Photoelectric: Photoelectric: PEMonsmedite = 429.96 barns/electron
U=PEMonsmedite x relectron=1,238.97 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 74.14 (Gamma Ray American Petroleum Institute Units)
Concentration of Monsmedite per GRapi unit = 1.35 (%)

Estimated Radioactivity from Monsmedite - barely detectable


Monsmedite Classification

Help on  Dana Class: Dana Class: (29)Hydrated Acid and Sulfates
  (29.01)(Hydrated, Acid)
  (29.01.03)Dana Group Monsmedite? H8K2Tl2(SO4)8•11(H2O) F d3c 4/m 3 2/m
Help on  Strunz Class: Strunz Class: 07.CC.25 07 - SULFATES (SELENATES, TELLURATES)
  07.C - Sulfates (selenates, etc.) without Additional Anions, with H2O
  07.CC -With medium-sized and large cations
07.CC.25 Monsmedite? H8K2Tl2(SO4)8•11(H2O) F d3c 4/m 3 2/m
07.CC.25 Voltaite K2Fe5Fe3Al(SO4)12•18(H2O) F d3c 4/m 3 2/m
07.CC.25 Zincovoltaite K2Zn5Fe3Al(SO4)12•18(H2O) F d3c 4/m 3 2/m
07.CC.25 Pertlikite! K2(Fe,Mg)2(Mg,Fe)4Fe2Al(SO4)12•18H2O I 41/acd 4/m 2/m 2/m

Other Monsmedite Information

Help on References: References: NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Dana8)
Help on See Also: See Also: Links to other databases for Monsmedite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - Ecole des Mines de Paris
4 - GeoScienceWorld
5 - Google Images
6 - Google Scholar
7 - MinDAT
8 - Mineralienatlas (Deutsch)
9 - Online Mineral Museum
10 - QUT Mineral Atlas
11 - Ruff.Info

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Dana No: Strunz No: 07.CC.25





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