General Petalite Information![]() LiAlSi4O10 |
![]() Molecular Weight = 305.15 gm |
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Lithium 2.09 % Li 4.50 % Li2O |
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Aluminum 8.75 % Al 16.54 % Al2O3 |
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Silicon 36.72 % Si 78.56 % SiO2 |
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Oxygen 52.43 % O |
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100.00 % 99.61 % = TOTAL OXIDE |
![]() Li0.92Al0.99Si3.99O10 |
![]() In granite pegmatites, locally constituting an ore of lithium. |
![]() Valid Species (Pre-IMA) 1800 |
![]() Mining Academy, Freiberg, Germany, Link to MinDat.org Location Data. |
![]() From the Greek petalon - "leaf" in allusion to the perfect basal cleavage. |
![]() Petalite |
![]() ![]() ICSD 100348 |
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PDF 35-463 |
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Petalite Crystallography![]() a:b:c =2.2869:1:1.4845 |
![]() a = 11.754, b = 5.1395, c = 7.6296, Z = 2; beta = 113.04° V = 424.14 Den(Calc)= 2.39 |
![]() Monoclinic - PrismaticH-M Symbol (2/m) Space Group: P 2/a |
![]() By Intensity(I/Io): 3.731(1), 3.672(0.34), 3.649(0.24),3.51(0.16), 1.934(0.07), 2.57(0.06), 2.071(0.05), |
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| Physical Properties of Petalite![]() {001} Perfect, {???} Imperfect |
![]() Colorless, Gray, Yellow, Yellow gray, White. |
![]() 2.39 - 2.46, Average = 2.42 |
![]() Transparent to translucent |
![]() Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments. |
![]() Massive - Uniformly indistinguishable crystals forming large masses. |
![]() 6-6.5 - Orthoclase-Pyrite |
![]() Non-Fluorescent. |
![]() Vitreous - Pearly |
![]() colorless |
| Optical Properties of Petalite![]() 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 Ncalc = 1.51 - 1.52 ![]() Biaxial (+), a=1.504, b=1.51, g=1.516, bire=0.0120 |
| Calculated Properties of Petalite![]() Bulk Density (Electron Density)=2.41 gm/cc |
note: Specific Gravity of Petalite =2.43 gm/cc. ![]() Fermion Index = 0.01 |
Boson Index = 0.99 ![]() PEPetalite = 1.69 barns/electron |
U=PEPetalite x rElectron Density= 4.06 barns/cc. ![]() GRapi = 0 (Gamma Ray American Petroleum Institute Units) |
Petalite is Not Radioactive | Petalite Classification![]() 72.06.01.01 (72)Phyllosilicate Two-Dimensional Infinite Sheets with Other Than Six-Membered Rings |
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(72.06)with tetrahedral Al cross-linking |
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(72.06.01)Dana Group |
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![]() 09.EF.05 09 - SILICATES (Germanates) |
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09.E - Phyllosilicates |
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09.EF -Single nets with 6-membered rings, ± other rings |
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| Other Petalite Information![]() NAME( AntBidBlaNic2) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Ford32) |
![]() Links to other databases for Petalite : |
1 - Am. Min. Crystal Structure Database 2 - Athena 3 - EUROmin Project 4 - Ecole des Mines de Paris 5 - GeoScienceWorld 6 - Google Images 7 - Google Scholar 8 - Handbook of Mineralogy (MinSocAm) 9 - Handbook of Mineralogy (UofA) 10 - MinDAT 11 - Mineralienatlas (Deutsch) 12 - Online Mineral Museum 13 - QUT Mineral Atlas 14 - Ruff.Info 15 - Scandinavian mineral gallery 16 - Tradeshop.com - The Rainbow of Gems 17 - WWW-MINCRYST Search for Petalite using: Visit our Advertisers for Petalite : A Bijoux Google Search for PetaliteAdam's Minerals Google Search for Petalite Cape Minerals Google Search for Petalite Dakota Matrix Minerals Google Search for Petalite Excalibur Mineral Corp. Google Search for Petalite Exceptional Minerals Google Search for Petalite John Betts Fine Minerals Search for Petalite McDougall Minerals Google Search for Petalite Mineral News Website Link Rock and Mineral Shows Google Search for Petalite Weinrich Minerals, Inc. Google Search for Petalite Ask about Petalite here : Print or Cut-and-Paste your Petalite Specimen Label here :
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