Monsmedite Mineral Data (original) (raw)
General Monsmedite Information
H8K2Tl2(SO4)8•11(H2O)
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
H8K2Tl2(SO4)8•11(H2O)
In the oxidation zone of a silver-bearing lead-zinc deposit. Discredited monsmedite=votaite.
Discredited IMA 2002
Baia Sprie, Baia Mare region, Romania. Link to MinDat.org Location Data.
Named in 1968 from the Latin 'Mons Medius', for Baia Sprie, Romania, the locality for the mineral.
Discredited
IMA1998-D
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Monsmedite Crystallography
a = 25.29, Z = 20; V = 16,175.08 Den(Calc)= 3.00
Isometric - HexoctahedralH-M Symbol (4/m 3 2/m) Space Group: F d3c
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
{???} Good, {???} Good
Dark green, Black.
3
Subopaque
Euhedral Crystals - Occurs as well-formed crystals showing good external form.
2 - Gypsum
Resinous
dark green
Optical Properties of Monsmedite
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
Biaxial (-), a=1.6, g=1.611, bire=0.0110
Calculated Properties of Monsmedite
Bulk Density (Electron Density)=2.88 gm/cc
note: Specific Gravity of Monsmedite =3.00 gm/cc.
Fermion Index = 0.0015516873
Boson Index = 0.9984483127
PEMonsmedite = 429.96 barns/electron
U=PEMonsmedite x relectron=1,238.97 barns/cc.
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
29.01.03.01 (29)Hydrated Acid and Sulfates
(29.01)(Hydrated, Acid)
(29.01.03)Dana Group
29.01.03.01 Monsmedite? H8K2Tl2(SO4)8•11(H2O) F d3c 4/m 3 2/m
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
NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Dana8)
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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Monsmedite
H8K2Tl2(SO4)8•11(H2O)
Dana No: 29.01.03.01 Strunz No: 07.CC.25
Locality:
Notes: