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Lanmuchangite

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About LanmuchangiteHide

Formula:
Tl+Al(SO4)2 · 12H2O
Colour:
pale yellow, white
Lustre:
Vitreous
Hardness:
3 - 3½
Specific Gravity:
2.22
Crystal System:
Isometric
Member of:
Name:
After the type locality: Lanmuchang Tl-Hg ore deposit, Guizhou, China.
This page provides mineralogical data about Lanmuchangite.


Classification of LanmuchangiteHide

Approved
Approval Year:
2001
7.CC.20

7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
C : Sulfates (selenates, etc.) without additional anions, with H2O
C : With medium-sized and large cations

Physical Properties of LanmuchangiteHide

Vitreous
Transparency:
Transparent
Colour:
pale yellow, white
Streak:
white
Hardness:
3 - 3½ on Mohs scale
Hardness:
VHN100=94 - 124 - Vickers
Hardness Data:
Measured
Tenacity:
Brittle
Density:
2.22 g/cm3 (Measured)    2.35 g/cm3 (Calculated)

Optical Data of LanmuchangiteHide

Type:
Isotropic
RI values:
n = 1.495
Birefringence:
Isotropic minerals have no birefringence
Surface Relief:
Moderate

Chemical Properties of LanmuchangiteHide

Formula:
Tl+Al(SO4)2 · 12H2O
IMA Formula:
TlAl(SO4)2 · 12H2O
Common Impurities:
K,Mg,Ca,Fe,Si

Crystallography of LanmuchangiteHide

Crystal System:
Isometric
Class (H-M):
m3 (2/m 3) - Diploidal
Space Group:
Pa3
Cell Parameters:
a = 12.212 Å
Unit Cell V:
1871 ų
Z:
4
Morphology:
Anhedral grains to 0.09 mm, also columnar.
Twinning:
None mentioned.

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
7.03 Å(54)
6.11 Å(27)
4.314 Å(100)
3.524 Å(24)
2.801 Å(70)
2.731 Å(35)

Type Occurrence of LanmuchangiteHide

General Appearance of Type Material:
Compact aggregates to 10 mm, consisting either of anhedral granular crystals with no distinct boundaries ranging in size from 40 µm to 90 µm or, rarely, of euhedral to subhedral columnar crystals ranging in diameter from 15 µm to 65 µm.
Geological Setting of Type Material:
In the oxidation zone of a Tl-Hg deposit.
Associated Minerals at Type Locality:

Synonyms of LanmuchangiteHide

Other Language Names for LanmuchangiteHide

Simplified Chinese:铊明矾
Traditional Chinese:鉈明礬

Relationship of Lanmuchangite to other SpeciesHide

Member of:
Other Members of this group:
Alum-(K)KAl(SO4)2 · 12H2OIso. m3 (2/m 3) : Pa3
Alum-(Na)NaAl(SO4)2 · 12H2O
Tschermigite(NH4)Al(SO4)2 · 12H2OIso. m3 (2/m 3) : Pa3

Related Minerals - Nickel-Strunz GroupingHide

7.CC.CobaltoblöditeNa2Co(SO4)2•4H2OMon. 2/m : P21/b
7.CC.AndychristyitePbCu2+Te6+O5(H2O)Tric. 1 : P1
7.CC.Ammoniovoltaite(NH4)2Fe2+5Fe3+3Al(SO4)12(H2O)18Iso. m3m (4/m 3 2/m) : Fd3c
7.CC.05KrausiteKFe(SO4)2 · H2OMon. 2/m : P21/m
7.CC.10TamarugiteNaAl(SO4)2 · 6H2OMon. 2/m
7.CC.15KaliniteKAl(SO4)2 · 11H2OMon. 2/m : B2/b
7.CC.15MendoziteNaAl(SO4)2 · 11H2OMon. 2/m
7.CC.20Lonecreekite(NH4)Fe3+(SO4)2 · 12H2OIso.
7.CC.20Alum-(K)KAl(SO4)2 · 12H2OIso. m3 (2/m 3) : Pa3
7.CC.20Alum-(Na)NaAl(SO4)2 · 12H2O
7.CC.20Tschermigite(NH4)Al(SO4)2 · 12H2OIso. m3 (2/m 3) : Pa3
7.CC.25VoltaiteK2Fe2+5Fe3+3Al(SO4)12 · 18H2OIso. m3m (4/m 3 2/m) : Fd3c
7.CC.25ZincovoltaiteK2Zn5Fe3+3Al(SO4)12 · 18H2OIso. m3m (4/m 3 2/m) : Fd3c
7.CC.25PertlikiteK2(Fe2+,Mg)2Mg4Fe3+2Al(SO4)12 · 18H2OTet. 4/mmm (4/m 2/m 2/m) : I41/acd
7.CC.25Ammoniomagnesiovoltaite(NH4)2Mg2+5Fe3+3Al(SO4)12 · 18H2OIso. m3m (4/m 3 2/m) : Fd3c
7.CC.30KröhnkiteNa2Cu(SO4)2 · 2H2OMon. 2/m : P21/b
7.CC.35FerrinatriteNa3Fe(SO4)3 · 3H2OTrig. 3 : P3
7.CC.40GoldichiteKFe(SO4)2 · 4H2OMon. 2/m : P21/b
7.CC.45LöweiteNa12Mg7(SO4)13 · 15H2OTrig.
7.CC.50BlöditeNa2Mg(SO4)2 · 4H2OMon. 2/m
7.CC.50NickelblöditeNa2(Ni,Mg)(SO4)2 · 4H2O
7.CC.50ChangoiteNa2Zn(SO4)2 · 4H2OMon. 2/m : P21/b
7.CC.55LeoniteK2Mg(SO4)2 · 4H2OMon. 2/m
7.CC.55MereiteriteK2Fe(SO4)2 · 4H2OMon.
7.CC.60Boussingaultite(NH4)2Mg(SO4)2 · 6H2OMon. 2/m : P21/b
7.CC.60CyanochroiteK2Cu(SO4)2 · 6H2OMon. 2/m
7.CC.60Mohrite(NH4)2Fe(SO4)2 · 6H2OMon. 2/m : P21/b
7.CC.60Nickelboussingaultite(NH4)2Ni(SO4)2 · 6H2O
7.CC.60PicromeriteK2Mg(SO4)2 · 6H2OMon. 2/m
7.CC.65PolyhaliteK2Ca2Mg(SO4)4 · 2H2OTric. 1
7.CC.70LeightoniteK2Ca2Cu(SO4)4 · 2H2OTric.
7.CC.75AmarilliteNaFe(SO4)2 · 6H2OMon. 2/m : B2/b
7.CC.80KonyaiteNa2Mg(SO4)2 · 5H2OMon. 2/m : P21/b
7.CC.85WattevilleiteNa2Ca(SO4)2 · 4H2O (?)Orth.

Other InformationHide

Health Risks:
Although no particular details given, as a water-soluble Thallium salt this should be regarded as highly lethal, and any direct contact with this mineral should be avoided.

References for LanmuchangiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Chen Daiyan, Wang Guanxin, Zou Zhenxi, and Chen Yuming (2001): A new mineral - Lanmuchangite. Acta Mineralogica Sinica 21(3), 271-277 (in Chinese with English abstract). - American Mineralogist (2002), 87, 996-997 (abstract).
Mineralogical Record: 33: 354 (2002).

Internet Links for LanmuchangiteHide

Localities for LanmuchangiteHide

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
China (TL)
 
  • Guizhou
    • Qianxinan
      • Xingren County
Chen Daiyan, Wang Guanxin, Zou Zhenxi, and Chen Yuming (2001): Acta Mineralogica Sinica 21(3), 271-277.
North Macedonia
 
  • Kavadarci
    • Rožden (Rozhden; Roszdan)
EDS and PXRD analyzed by Joy Desor.
 
矿物 and/or 产地  
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