Lanmuchangite Mineral Data

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General Lanmuchangite Information

Chemical Formula:

TlAl(SO4)2•12(H2O)

Composition:

Molecular Weight = 637.87 gm

Aluminum 4.23 % Al 7.99 % Al₂O₃

Thallium 32.04 % Tl 33.30 % Tl₂O

Hydrogen 3.76 % H 33.61 % H₂O

Sulfur 10.05 % S 25.10 % SO₃

Oxygen 49.91 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

TlAl(SO₄)₂•11.9(H₂O)

Environment:

Secondary mineral in the oxidation zone.

IMA Status:

Approved IMA 2001 (Dana # Added)

Locality:

Lanmuchang Tl-Hg deposit, Xinren County, Guizhou Province, China. Link to MinDat.org Location Data.

Name Origin:

Named for the locality.

Synonym:

IMA2001-018

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Lanmuchangite Crystallography

Cell Dimensions:

a = 12.212, Z = 4; V = 1,821.21 Den(Calc)= 2.33

Crystal System:

Isometric - DiploidalH-M Symbol (2/m 3) Space Group: P a3

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

By Intensity(I/I_o): 4.314(1)(220), 2.801(0.7)(331), 7.03(0.54)(111),2.731(0.35)(420), 6.11(0.27)(200), 3.524(0.24)(222), 3.676(0.22),

Crystal Structure:

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drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
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Nyburg S C , Steed J , Aleksovska S , Petrusevski V M , Acta Crystallographica, Section B , 56 (2000) p.204-209, Structure of the alums. I. On the sulfate group disorder in the alpha-alums, Locality: synthetic, Sample: T = 173 K

Physical Properties of Lanmuchangite

Color:

Light yellow, White.

Density:

2.22

Diaphaneity:

Transparent

Habit:

Aggregates - Made of numerous individual crystals or clusters.

Habit:

Anhedral Grains - Granular minerals without the expression of crystal shapes

Habit:

Water Soluble - Water soluble mineral.

Hardness:

3-3.5 - Calcite-Copper Penny

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Lanmuchangite

Gladstone-Dale:

CI meas= -0.044 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= 0.005 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2124,KPDmeas= 0.223,KC= 0.2135
Ncalc = 1.47 - 1.5

Optical Data:

Isotropic, n=1.495.

Calculated Properties of Lanmuchangite

Electron Density:

Bulk Density (Electron Density)=2.26 gm/cc
note: Specific Gravity of Lanmuchangite =2.33 gm/cc.

Fermion Index:

Fermion Index = 0.00099928
Boson Index = 0.99900072

Photoelectric:

PE_{Lanmuchangite}= 487.32 barns/electron
U=PE_{Lanmuchangite} x rElectron Density=1,100.08 barns/cc.

Radioactivity:

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

Lanmuchangite Classification

Dana Class:

29.05.05.05 (29)Hydrated Acid and Sulfates

(29.05)where A B (XO4)2 · x(H2O)

(29.05.05)Alum Group

29.05.05.01 Alum-(K) KAl(SO4)2•12(H2O) P a3 2/m 3

29.05.05.02 Alum-(Na) NaAl(SO4)2•12(H2O) P a3 2/m 3

29.05.05.03 Tschermigite (NH4)Al(SO4)2•12(H2O) P a3 2/m 3

29.05.05.04 Lonecreekite (NH4)(Fe,Al)(SO4)2•12(H2O) P a3 2/m 3

29.05.05.05 Lanmuchangite! TlAl(SO4)2•12(H2O) P a3 2/m 3

Strunz Class:

07.CC.20 07 - SULFATES (SELENATES, TELLURATES)

07.C - Sulfates (selenates, etc.) without Additional Anions, with H2O

07.CC -With medium-sized and large cations

07.CC.20 Lonecreekite (NH4)(Fe,Al)(SO4)2•12(H2O) P a3 2/m 3

07.CC.20 Alum-(K) KAl(SO4)2•12(H2O) P a3 2/m 3

07.CC.20 Alum-(Na) NaAl(SO4)2•12(H2O) P a3 2/m 3

07.CC.20 Lanmuchangite! TlAl(SO4)2•12(H2O) P a3 2/m 3

07.CC.20 Tschermigite (NH4)Al(SO4)2•12(H2O) P a3 2/m 3

Other Lanmuchangite Information

References:

NAME( AmMin, vol 87, p 996) PHYS. PROP.(AmMin, vol 87, p 996) OPTIC PROP.(AmMin, vol 87, p 996)

See Also:

Links to other databases for Lanmuchangite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - Handbook of Mineralogy (MinSocAm)
7 - Handbook of Mineralogy (UofA)
8 - MinDAT
9 - Mineralienatlas (Deutsch)
10 - Online Mineral Museum
11 - QUT Mineral Atlas
12 - Ruff.Info

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

Lanmuchangite

TlAl(SO4)2•12(H2O)
Dana No: 29.05.05.05 Strunz No: 07.CC.20
Locality:

Notes: