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Liddicoatite Mineral Data

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General Liddicoatite Information

Help on Chemical  Formula: Chemical Formula: Ca(Li,Al)3Al6(BO3)3Si6O18(O,OH,F)4
Help on Composition: Composition: Molecular Weight = 917.49 gm
   Sodium     0.75 %  Na    1.01 % Na2O
   Lithium    1.21 %  Li    2.61 % Li2O
   Calcium    3.06 %  Ca    4.28 % CaO
   Aluminum  18.23 %  Al   34.45 % Al2O3
   Silicon   18.37 %  Si   39.29 % SiO2
   Boron      3.53 %  B    11.38 % B2O3
   Hydrogen   0.32 %  H     2.85 % H2O
   Oxygen    52.66 %  O
   Fluorine   1.86 %  F     1.86 % F
               -   %   F    -0.78 % -O=F2    
            ______        ______ 
            100.00 %       96.95 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Ca0.7Na0.3Li1.6Al6.2(BO3)3Si6O18.3(OH)2.9F0.9
Help on Environment: Environment: Detrital in soil, an apparent alluvial product of the local pegmatites.
Help on IMA Status: IMA Status: Approved IMA 1977 (Dana # Changed)
Help on Locality: Locality: From Antsirabe, Tsilaizina, and Anjanabonoina, Madagascar. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Richard T. Liddicot (1918-2003), gemologist, who invented the diamond grading system, for his many contributions to the Gemological Institute of America.
Help on Name Pronunciation: Name Pronunciation: Liddicoatite + Pronunciation Say LIDDICOATITE
Help on Synonym: Synonym: Liddicoatite - (

Liddicoatite Image

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Comments: Dark green translucent liddicoatite crystal prism.
Location: Antandrokomby, Madagascar. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

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Comments: Complexly colored red zone, and the skin which varies from green to yellow terminated crystals of liddicoatite.
Location: Anjanabonoina, Betafo, Antsirabé Madagascar. Scale: Specimen size: 3.3 x 1.8 x 1.5 cm.
© Fabre Minerals

Liddicoatite Crystallography

Help on Axial Ratios: Axial Ratios: a:c = 1:0.44888
Help on Cell Dimensions: Cell Dimensions: a = 15.875, c = 7.126, Z = 3; V = 1,555.26 Den(Calc)= 2.94
Help on Crystal System: Crystal System: Trigonal - Ditrigonal Pyramidal H-M Symbol (3m) Space Group: R 3m
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.933(1), 2.559(0.85), 3.962(0.55),3.445(0.5), 4.197(0.5), 2.025(0.4), 1.9054(0.35),

Physical Properties of Liddicoatite

Help on Cleavage: Cleavage: {0001} Poor
Help on Color: Color: Blue, Brown, Green, Pink, Red.
Help on Density: Density: 3.02
Help on Diaphaneity: Diaphaneity: Transparent to Subtranslucent
Help on Fracture: Fracture: Conchoidal - Uneven - Uneven fracture producing small, conchoidal fragments.
Help on Habit: Habit: Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).
Help on Habit: Habit: Triangular Crystals - Occurs as triangular shaped crystals.
Help on Hardness: Hardness: 7.5 - Garnet
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: white

Optical Properties of Liddicoatite

Help on Dichroism (e): Dichroism (e): light brown.
Help on Dichroism (w): Dichroism (w): dark brown.
Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.006 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= -0.034 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2139,KPDmeas= 0.2083,KC= 0.207
Ncalc = 1.61 - 1.63
Help on Optical Data: Optical Data: Uniaxial (-), e=1.621, w=1.637, bire=0.0160.

Calculated Properties of Liddicoatite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.99 gm/cc
note: Specific Gravity of Liddicoatite =3.02 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.01
Boson Index = 0.99
Help on Photoelectric: Photoelectric: PELiddicoatite = 1.71 barns/electron
U=PELiddicoatite x rElectron Density= 5.10 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Liddicoatite is Not Radioactive

Liddicoatite Classification

Help on  Dana Class: Dana Class: 61.03b.01.02 (61)Cyclosilicate Six-Membered Rings
  (61.03b)with borate groups (Calcic Tourmaline Subgroup)
  (61.03b.01)Liddicoatite Subgroup
61.03b.01.02 Liddicoatite! Ca(Li,Al)3Al6(BO3)3Si6O18(O,OH,F)4 R 3m 3m
61.03b.01.03 Uvite! (Ca,Na)(Mg,Fe)3Al5Mg(BO3)3Si6O18(OH,F)4 R 3m 3m
61.03b.01.04 Feruvite! (Ca,Na)(Fe,Mg,Ti)3(Al,Mg,Fe)6(BO3)3Si6O18(OH)4 R 3m 3m
61.03b.01.05 Hydroxyuvite! CaMg3(Al5Mg)(Si6O18)(BO3)3(OH)3(OH) R 3m 3m
Help on  Strunz Class: Strunz Class: 09.CK.05 09 - SILICATES (Germanates)
  09.C - Cyclosilicates
  09.CK -[Si6O18]12- 6-membered single rings, with insular complex anions
09.CK.05 Chromdravite! NaMg3(Cr,Fe)6(BO3)3Si6O18(OH)4 R 3m 3m
09.CK.05 Feruvite! (Ca,Na)(Fe,Mg,Ti)3(Al,Mg,Fe)6(BO3)3Si6O18(OH)4 R 3m 3m
09.CK.05 Dravite NaMg3Al6(BO3)3Si6O18(OH)4 R 3m 3m
09.CK.05 Buergerite! NaFe3Al6(BO3)3Si6O21F R 3m 3m
09.CK.05 Foitite! []Na<0.5(Fe,Al)3Al6Si6O18(BO3)3(OH)4 R 3m 3m
09.CK.05 Liddicoatite! Ca(Li,Al)3Al6(BO3)3Si6O18(O,OH,F)4 R 3m 3m
09.CK.05 Elbaite Na(Li,Al)3Al6(BO3)3Si6O18(OH)4 R 3m 3m
09.CK.05 Rossmanite! []LiAl2Al6(Si6O18)(BO3)3(OH)4 R 3m 3m
09.CK.05 Olenite! NaAl3Al6(BO3)3(Si6O18)(O,OH)4 R 3m 3m
09.CK.05 Povondraite! (Na,K)(Fe,Fe)3(Fe,Mg,Al)6(BO3)3Si6O18(OH)4 R 3m 3m
09.CK.05 Schorl NaFe3Al6(BO3)3Si6O18(OH)4 R 3m 3m
09.CK.05 Uvite (Ca,Na)(Mg,Fe)3Al5Mg(BO3)3Si6O18(OH,F)4 R 3m 3m
09.CK.05 Vanadiumdravite! NaMg3V6(Si6O18)(BO3)3(OH)4 R 3m 3m
09.CK.05 Magnesiofoitite! [](Mg2Al)Al6(Si6O18)(BO3)3(OH)4 R 3m 3m
09.CK.05 Hydroxyuvite! CaMg3(Al5Mg)(Si6O18)(BO3)3(OH)3(OH) R 3m 3m
09.CK.05 Schorl-(F)! NaFe3Al6Si6O18)(BO3)3(OH)3(F,OH) R 3m 3m

Other Liddicoatite Information

Help on References: References: NAME( AntBidBlaNic2) PHYS. PROP.(AntBidBlaNic2) OPTIC PROP.(AntBidBlaNic2)
Help on See Also: See Also: Links to other databases for Liddicoatite :
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 - Mineral and Gemstone Kingdom
12 - Mineralienatlas (Deutsch)
13 - Online Mineral Museum
14 - QUT Mineral Atlas
15 - Ruff.Info

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Dana No: 61.03b.01.02 Strunz No: 09.CK.05





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