Liddicoatite Mineral Data
General Liddicoatite Information
Chemical Formula:
Ca(Li,Al)3Al6(BO3)3Si6O18(O,OH,F)4
Composition:
Molecular Weight = 917.49 gm
Sodium 0.75 % Na 1.01 % Na2 O
Lithium 1.21 % Li 2.61 % Li2 O
Calcium 3.06 % Ca 4.28 % CaO
Aluminum 18.23 % Al 34.45 % Al2 O3
Silicon 18.37 % Si 39.29 % SiO2
Boron 3.53 % B 11.38 % B2 O3
Hydrogen 0.32 % H 2.85 % H2 O
Oxygen 52.66 % O
Fluorine 1.86 % F 1.86 % F
- %
F -0.78 % -O=F2
______ ______
100.00 % 96.95 % = TOTAL OXIDE
Empirical Formula:
Ca0.7 Na0.3 Li1.6 Al6.2 (BO3 )3 Si6 O18.3 (OH)2.9 F0.9
Environment:
Detrital in soil, an apparent alluvial product of the local pegmatites.
IMA Status:
Approved IMA 1977 (Dana # Changed)
Locality:
From Antsirabe, Tsilaizina, and Anjanabonoina, Madagascar. Link to MinDat.org Location Data.
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.
Name Pronunciation:
Liddicoatite + Pronunciation
Synonym:
Liddicoatite - (61.3.1.2)
Tourmaline
Liddicoatite Image
Images:
Images:
Liddicoatite
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
Axial Ratios:
a:c = 1:0.44888
Cell Dimensions:
a = 15.875, c = 7.126, Z = 3; V = 1,555.26 Den(Calc)= 2.94
Crystal System:
Trigonal - Ditrigonal Pyramidal H-M Symbol (3m) Space Group: R 3m
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
Cleavage:
{0001} Poor
Color:
Blue, Brown, Green, Pink, Red.
Density:
3.02
Diaphaneity:
Transparent to Subtranslucent
Fracture:
Conchoidal - Uneven - Uneven fracture producing small, conchoidal fragments.
Habit:
Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).
Habit:
Triangular Crystals - Occurs as triangular shaped crystals.
Hardness:
7.5 - Garnet
Luster:
Vitreous (Glassy)
Streak:
white
Optical Properties of Liddicoatite
Dichroism (e):
light brown.
Dichroism (w):
dark brown.
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
Optical Data:
Uniaxial (-), e=1.621, w=1.637, bire=0.0160.
Calculated Properties of Liddicoatite
Electron Density:
Bulk Density (Electron Density)=2.99 gm/cc note: Specific Gravity of Liddicoatite =3.02 gm/cc.
Fermion Index:
Fermion Index = 0.01 Boson Index = 0.99
Photoelectric:
PELiddicoatite = 1.71 barns/electronU=PELiddicoatite x r Electron Density= 5.10 barns/cc.
Radioactivity:
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Liddicoatite is Not Radioactive
Liddicoatite Classification
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
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
References:
NAME( AntBidBlaNic2) PHYS. PROP.(AntBidBlaNic2) OPTIC PROP.(AntBidBlaNic2)
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
16 - WWW-MINCRYST
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Liddicoatite
Ca(Li,Al)3Al6(BO3)3Si6O18(O,OH,F)4
Dana No: 61.03b.01.02 Strunz No: 09.CK.05
Locality:
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