Monsmedite Mineral Data

Monsmedite Mineral Data +

General Monsmedite Information

Chemical Formula:

H8K2Tl2(SO4)8·11(H2O)

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

Empirical Formula:

H₈K₂Tl₂(SO₄)₈·11(H₂O)

Environment:

In the oxidation zone of a silver-bearing lead-zinc deposit. Discredited monsmedite=votaite.

IMA Status:

Discredited IMA 2002

Locality:

Baia Sprie, Baia Mare region, Romania. Link to MinDat.org Location Data.

Name Origin:

Named in 1968 from the Latin 'Mons Medius', for Baia Sprie, Romania, the locality for the mineral.

Synonym:

Discredited

IMA1998-D

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Monsmedite Crystallography

Cell Dimensions:

a = 25.29, Z = 20; V = 16,175.08 Den(Calc)= 3.00

Crystal System:

Isometric - HexoctahedralH-M Symbol (4/m 3 2/m) Space Group: F d3c

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

By Intensity(I/I_o): 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

Cleavage:

[???] Good, [???] Good

Color:

Dark green, Black.

Density:

Diaphaniety:

Subopaque

Habit:

Euhedral Crystals - Occurs as well-formed crystals showing good external form.

Hardness:

2 - Gypsum

Luster:

Resinous

Streak:

dark green

Optical Properties of Monsmedite

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

Optical Data:

Biaxial (-), a=1.6, g=1.611, bire=0.0110

Calculated Properties of Monsmedite

Electron Density:

r_electron=2.88 gm/cc
note: r_Monsmedite=3.00 gm/cc.

Fermion Index

Fermion Index = 0.00155
Boson Index = 0.99845

Photoelectric:

PE_Monsmedite= 429.96 barns/electron
U=PE_Monsmedite x r_electron=1,238.97 barns/cc.

Radioactivity:

GRapi = 74.14 (Gamma Ray American Petroleum Institute Units)

Estimated Radioactivity from Monsmedite - barely detectable

Monsmedite Classification

Dana Class:

29.1.3.1 (29)Hydrated Acid and Sulfates

(29.1)(Hydrated, Acid)

(29.1.3)Dana Group

29.1.3.1 Monsmedite ? H8K2Tl2(SO4)8·11(H2O) F d3c 4/m 3 2/m

Strunz Class:

VI/C.10-10 VI - Sulfates,Chromates,Molybdates and Tungstates

VI/C - Water-bearing sulfates without unfamiliar anions. cations of medium size

VI/C.10 - Monsmedite series

VI/C.10-10 Monsmedite H8K2Tl2(SO4)8·11(H2O) F d3c 4/m 3 2/m

Other Monsmedite Information

References:

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

See Also:

Links to other databases for Monsmedite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 -Google Images 4 -Google Scholar 5 -MinDAT 6 -MinMax(Deutsch) 7 -MinMax(English) 8 -Mineralienatlas (Deutsch) 9 -QUT Mineral Atlas 10 -École des Mines de Paris

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Print or Cut-and-Paste your Monsmedite Specimen Label here :

Monsmedite

H8K2Tl2(SO4)8·11(H2O)
Dana No: 29.1.3.1 Strunz No: VI/C.10-10
Locality:

Notes: