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Luanshiweiite

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Luan Shiwei
Formula:
KLiAl1.50.5(Si3.5Al0.5)O10(OH,F)2
Hardness:
3
Specific Gravity:
2.851
Crystal System:
Monoclinic
Member of:
Name:
Named in honor of Luan Shiwei (August 1928, Zizhou, Shaanxi Province, China - 13 September 2012, Chengdu, China), professor of geology in the Chengdu College of Science and Technology. A known Chinese pegmatitic petrologist.
Luanshiweiite is the potassium analog at the interstratified cations and OH-dominant analog at the attached anion site of voloshinite.
Polytype: 2M1.


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Classification of LuanshiweiiteHide

Approved
Approval Year:
2012
First Published:
2013

Physical Properties of LuanshiweiiteHide

Hardness:
Tenacity:
Flexible
Cleavage:
Perfect
{001}
Density:
2.851 g/cm3 (Measured)    2.868 g/cm3 (Calculated)

Optical Data of LuanshiweiiteHide

Type:
Biaxial (-)

Chemical Properties of LuanshiweiiteHide

Formula:
KLiAl1.50.5(Si3.5Al0.5)O10(OH,F)2
IMA Formula:
KLiAl1.5(Si3.5Al0.5)O10(OH)2

Crystallography of LuanshiweiiteHide

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
B2/b
Setting:
C2/c
Cell Parameters:
a = 5.1861(7) Å, b = 8.9857(13) Å, c = 19.970(3) Å
β = 95.42(3)°
Ratio:
a:b:c = 0.577 : 1 : 2.222
Unit Cell V:
0.9265 ų
Z:
4
Morphology:
Scaly aggregate, grains

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
9.891 (35)
4.451 (31)
3.468 (42)
3.314 (36)
2.973 (34)
2.565 (100)
2.378 (31)
1.986 (30)

Type Occurrence of LuanshiweiiteHide

General Appearance of Type Material:
Scaly aggregates or in monomineralic veinlents. Most individual grains of luanshiweiite are less than 1 mm2.
Place of Conservation of Type Material:
Geological Museum of China, Beijing, China, registration number M11797
Geological Setting of Type Material:
REE granitic pegmatite dike
Associated Minerals at Type Locality:
Reference:
Fan G., Li G., Shen G., Xu J., Dai J. (2013) Luanshiweiite: A New Member of Lepidolite Series. Acta Mineralogica Sinica: 33: 713-721.

Synonyms of LuanshiweiiteHide

Other Language Names for LuanshiweiiteHide

Simplified Chinese:栾锂云母

Relationship of Luanshiweiite to other SpeciesHide

Member of:
Other Members of this group:
Brittle MicaSynonymous with Sprödglimmer.
Dioctahedral micaA major subgroup of the micas, where there are two octahedral cations per formula unit.
Trioctahedral micasA major subgroup of the micas, where there are three octahedral cations per formula unit.
UM1988-22-SiO:AlCaFFeHKLiMgKLiMgAl2Si3O10F2Mon.
VoloshiniteRb(LiAl1.51.5)(Al0.5Si3.5)O10F2Mon. 2/m : B2/b
YangzhumingiteKMg2.5(Si4O10)F2Mon. 2/m : B2/m

Other InformationHide

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for LuanshiweiiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Fan, G., Li, G., Shen, G., Xu, J., Dai, J. (2012) Luanshiweiite-2M1, IMA 2011-102. CNMNC Newsletter No. 13, June 2012, page 810. Mineralogical Magazine: 76: 807-817.
Fan G., Li G., Shen G., Xu J., Dai J. (2013) Luanshiweiite: A New Member of Lepidolite Series. Acta Mineralogica Sinica: 33: 713-721.

Internet Links for LuanshiweiiteHide

Localities for LuanshiweiiteHide

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)
 
  • Henan
    • Sanmenxia
      • Lushi Co.
        • Guanpo
          • Guanpo pegmatite field
Fan, G., Li, G., Shen, G., Xu, J., Dai, J. (2012) Luanshiweiite-2M1, IMA 2011-102. CNMNC Newsletter No. 13, June 2012, page 810; Mineralogical Magazine, 76, 807-817; Fan G., Li G., Shen G., Xu J., Dai J. (2013): Luanshiweiite: A New Member of Lepidolite Series. Acta Mineralogica Sinica, 33, 713-721.
Mineral and/or Locality  
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