Liddicoatite Mineral Data

Liddicoatite Mineral Data +

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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 % 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

Empirical Formula:

Ca_0.7Na_0.3Li_1.6Al_6.2(BO₃)₃Si₆O_18.3(OH)_2.9F_0.9

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.

Synonym:

Liddicoatite - (61.3.1.2)

Tourmaline

Liddicoatite Image

Images:

Liddicoatite

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

Images:

Liddicoatite

Comments: Complexly colored red zone, and the skin which varies from green to yellow terminated crystals of liddicoatite.
Location: Anjanabonoina, Betafo, Antsirab? 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 PyramidalH-M Symbol (3m) Space Group: R 3m

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 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),

Crystal Structure:

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Aurisicchio C , Demartin F , Ottolini L , Pezzotta F , European Journal of Mineralogy , 11 (1999) p.237-242, Homogeneous liddicoatite from Madagascar: a possible, reference material? First EMPA, SIMS and SREF data, Sample: 1, Locality: Madagascar

View Additional jPOWD Structure files for Liddicoatite
[1]

Physical Properties of Liddicoatite

Cleavage:

[0001] Poor

Color:

Blue, Brown, Green, Pink, Red.

Density:

3.02

Diaphaniety:

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

Optical Data:

Uniaxial (-), e=1.621, w=1.637, bire=0.0160.

Calculated Properties of Liddicoatite

Electron Density:

r_electron=2.99 gm/cc
note: r_Liddicoatite=3.02 gm/cc.

Fermion Index

Fermion Index = 0.01681
Boson Index = 0.98319

Photoelectric:

PE_Liddicoatite= 1.71 barns/electron
U=PE_Liddicoatite x r_electron= 5.10 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Liddicoatite is Not Radioactive

Liddicoatite Classification

Dana Class:

61.3b.1.2 (61)Cyclosilicate Six-Membered Rings

(61.3b)with borate groups (Calcic Tourmaline Subgroup)

(61.3b.1)Dana Group

61.3b.1.2 Liddicoatite ! Ca(Li,Al)3Al6(BO3)3Si6O18(O,OH,F)4 R 3m 3m

61.3b.1.3 Uvite! (Ca,Na)(Mg,Fe)3Al5Mg(BO3)3Si6O18(OH,F)4 R 3m 3m

61.3b.1.4 Feruvite! (Ca,Na)(Fe,Mg,Ti)3(Al,Mg,Fe)6(BO3)3Si6O18(OH)4 R 3m 3m

61.3b.1.5 IMA2000-030! CaMg3(Al5Mg)(Si6O18)(BO3)3(OH)3(OH) R 3m 3m

Strunz Class:

VIII/E.19-80 VIII - Silicates

VIII/E - Cyklosilicates, six rings [Si6O18]12-

VIII/E.19 - Tourmaline group

VIII/E.19-05 Rossmanite! []LiAl2Al6(Si6O18)(BO3)3(OH)4 R 3m 3m

VIII/E.19-10 Elbaite Na(Li,Al)3Al6(BO3)3Si6O18(OH)4 R 3m 3m

VIII/E.19-15 Magnesiofoitite! [](Mg2Al)Al6(Si6O18)(BO3)3(OH)4 R 3m 3m

VIII/E.19-20 Dravite NaMg3Al6(BO3)3Si6O18(OH)4 R 3m 3m

VIII/E.19-30 Chromdravite! NaMg3(Cr,Fe)6(BO3)3Si6O18(OH)4 R 3m 3m

VIII/E.19-35 Vanadiumdravite! NaMg3V6(Si6O18)(BO3)3(OH)4 R 3m 3m

VIII/E.19-50 Schorl NaFe3Al6(BO3)3Si6O18(OH)4 R 3m 3m

VIII/E.19-55 Foitite! []Na<0.5(Fe,Al)3Al6Si6O18(BO3)3(OH)4 R 3m 3m

VIII/E.19-60 Olenite! NaAl3Al6(BO3)3(Si6O18)(O,OH)4 R 3m 3m

VIII/E.19-70 Buergerite! NaFe3Al6(BO3)3Si6O21F R 3m 3m

VIII/E.19-75 Povondraite! (Na,K)(Fe,Fe)3(Fe,Mg,Al)6(BO3)3Si6O18(OH)4 R 3m 3m

VIII/E.19-80 Liddicoatite Ca(Li,Al)3Al6(BO3)3Si6O18(O,OH,F)4 R 3m 3m

VIII/E.19-90 Uvite (Ca,Na)(Mg,Fe)3Al5Mg(BO3)3Si6O18(OH,F)4 R 3m 3m

VIII/E.19-100 Feruvite! (Ca,Na)(Fe,Mg,Ti)3(Al,Mg,Fe)6(BO3)3Si6O18(OH)4 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 - Google Images
6 - Google Scholar
7 - Handbook of Mineralogy (MinSocAm)
8 - Handbook of Mineralogy (UofA)
9 - MinDAT
10 - MinMax(Deutsch)
11 - MinMax(English)
12 - Mineral and Gemstone Kingdom
13 - Mineralienatlas (Deutsch)
14 - QUT Mineral Atlas
15 - Ruff.Info
16 - WWW-MINCRYST

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Print or Cut-and-Paste your Liddicoatite Specimen Label here :

Liddicoatite

Ca(Li,Al)3Al6(BO3)3Si6O18(O,OH,F)4
Dana No: 61.3b.1.2 Strunz No: VIII/E.19-80
Locality:

Notes: