Petalite Mineral Data + Say PETALITE


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General Petalite Information

Help on Chemical  Formula: Chemical Formula: LiAlSi4O10
Help on Composition: Composition: Molecular Weight = 305.15 gm
   Lithium    2.09 %  Li    4.50 % Li2O
   Aluminum   8.75 %  Al   16.54 % Al2O3
   Silicon   36.72 %  Si   78.56 % SiO2
   Oxygen    52.43 %  O
            ______        ______ 
            100.00 %       99.61 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Li0.92Al0.99Si3.99O10
Help on Environment: Environment: In granite pegmatites, locally constituting an ore of lithium.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1800
Help on Locality: Locality: Mining Academy, Freiberg, Germany, Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: From the Greek petalon - "leaf" in allusion to the perfect basal cleavage.
Help on Synonym: Synonym: ICSD 100348
  PDF 35-463
 

Petalite Image

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Petalite

Comments: Translucent, gemmy , equant petalite crystal with an etched surface texture resulting in irregular faces.
Location: Paprok, Konar (Kunar; Konarh; Konarha; Nuristan) Province, Afghanistan. Scale: 5x3.5x3 cm.
© John Betts - Fine Minerals

Petalite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =2.2869:1:1.4845
Help on Cell Dimensions: Cell Dimensions: a = 11.754, b = 5.1395, c = 7.6296, Z = 2; beta = 113.04° V = 424.14 Den(Calc)= 2.39
Help on Crystal System: Crystal System: Monoclinic - PrismaticH-M Symbol (2/m) Space Group: P 2/a
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.7255(1), 3.7341(0.95), 3.6734(0.75),
Click Here for Large Petalite Structure Window Crystal Structure:

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Tagai T , Ried H , Joswig W , Korekawa M , Zeitschrift fur Kristallographie , 160 (1982) p.159-170, Kristallographische untersuchungen eines petalits mittels neutronenbeugung und, transmissionselektronenmikroskopie, Locality: Varutrask, Sweden

 

Physical Properties of Petalite

Help on Cleavage: Cleavage: [001] Perfect, [???] Imperfect
Help on Color: Color: Colorless, Gray, Yellow, Yellow gray, White.
Help on Density: Density: 2.39 - 2.46, Average = 2.42
Help on Diaphaniety: Diaphaniety: Transparent to translucent
Help on Fracture: Fracture: Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.
Help on Habit: Habit: Massive - Uniformly indistinguishable crystals forming large masses.
Help on Hardness: Hardness: 6-6.5 - Orthoclase-Pyrite
Help on Luminescence: Luminescence: Fluorescent.
Help on Luster: Luster: Vitreous - Pearly
Help on Streak: Streak: colorless
 

Optical Properties of Petalite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.006 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= -0.009 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2134,KPDmeas= 0.2103,KC= 0.2115
Help on Optical Data: Optical Data: Biaxial (+), a=1.504, b=1.51, g=1.516, bire=0.0120
 

Calculated Properties of Petalite

Help on Electron Density: Electron Density:

relectron=2.41 gm/cc
note: rPetalite =2.43 gm/cc.

Help on Fermion Index Fermion Index Fermion Index = 0.01897
Boson Index = 0.98103
Help on Photoelectric: Photoelectric:

PEPetalite = 1.69 barns/electron
U=PEPetalite x relectron= 4.06 barns/cc.

Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Petalite is Not Radioactive

 

Petalite Classification

Help on  Dana Class: Dana Class: 72.6.1.1 (72)Phyllosilicate Two-Dimensional Infinite Sheets with Other Than Six-Membered Rings
  (72.6)with tetrahedral Al cross-linking
  (72.6.1)Dana Group
 
72.6.1.1 Petalite LiAlSi4O10 P 2/a 2/m
Help on  Strunz Class: Strunz Class: VIII/J.03-10 VIII - Silicates
  VIII/J - Tectosilicates (network) without anions unfamiliar to the tetraheders
  VIII/J.03 - Petalite - Virgilite series
 
VIII/J.03-10 Petalite LiAlSi4O10 P 2/a 2/m
 
VIII/J.03-20 Virgilite LixAlxSi3-xO6 P 6222,P 6422 6 2 2
 
VIII/J.03-30 Lisitsynite! KBSi2O6 P 212121 2 2 2
 

Other Petalite Information

Help on References: References: NAME( AntBidBlaNic2) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Ford32)
Help on See Also: See Also: Links to other databases for Petalite :
1 -Am. Min. Crystal Structure Database 2 - Applied Mineralogy 3 -Athena 4 - Crocoite.com Mineral Locations 5 - EUROmin Project 6 -Google Images 7 -Google Scholar 8 -Handbook of Mineralogy (MinSocAm) 9 -Handbook of Mineralogy (UofA) 10 -MinDAT 11 -MinMax(Deutsch) 12 -MinMax(English) 13 -Mineralienatlas (Deutsch) 14 -QUT Mineral Atlas 15 - Scandinavian mineral gallery 16 - Tradeshop.com - The Rainbow of Gems 17 - WWW-MINCRYST 18 -École des Mines de Paris

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Petalite

LiAlSi4O10
Dana No: 72.6.1.1 Strunz No: VIII/J.03-10
Locality:

 

Notes:

 

 
   
 
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