Sugilite Mineral Data

General Sugilite Information

Chemical Formula:

KNa2(Fe+++,Mn+++,Al)2Li3Si12O30

Composition:

Molecular Weight = 1,041.66 gm

Potassium 3.04 % K 3.66 % K₂O

Sodium 1.83 % Na 2.47 % Na₂O

Lithium 1.41 % Li 3.04 % Li₂O

Titanium 0.28 % Ti 0.46 % TiO₂

Manganese 3.11 % Mn 4.47 % Mn₂O₃

Aluminum 1.53 % Al 2.89 % Al₂O₃

Iron 8.79 % Fe 12.57 % Fe₂O₃

Silicon 32.35 % Si 69.22 % SiO₂

Hydrogen 0.18 % H 1.57 % H₂O

Oxygen 47.48 % O

______ ______

100.00 % 100.35 % = TOTAL OXIDE

Empirical Formula:

K_0.81Na_0.19(H₂O)_0.91Na_0.64Fe³⁺_1.32Mn³⁺_0.59Ti_0.06Fe³⁺_0.03Li_2.12Al_0.59Fe³⁺_0.29Si₁₂O₃₀

Environment:

Stratabound, metamorphosed manganese deposits and peralkaline ignous rocks.

IMA Status:

Approved IMA 1976

Locality:

Iwagi Islet, Ehime Prefecture, Japan. Link to MinDat.org Location Data.

Name Origin:

Named for Ken-ichi Sugi (1901-1948), Japanese petrologist

Name Pronunciation:

Sugilite

Synonym:

ICSD 202624

PDF 47-1840

Sugilite Image

Images:

Effenbergerite Sugilite

Comments: Blue effenbergerite pods to across in massive purple sugilite.
Location: Wessels Mine, Kalahari Manganese Field, Northern Cape Province, South Africa. Scale: Crystal size 4 mm.
© John Veevaert

Images:

Sugilite Pectolite

Comments: Sharp terminated purple crystals of sugilite to 5mm on white, acicular pectolite.
Location: Wessels Mine, Kalahari, South Africa. Scale: Picture size 1.5 cm.
© John Veevaert

Sugilite Crystallography

Axial Ratios:

a:c = 1:1.39934

Cell Dimensions:

a = 10.009, c = 14.006, Z = 2; V = 1,215.14 Den(Calc)= 2.85

Crystal System:

Hexagonal - Dihexagonal Dipyramidal H-M Symbol (6/m 2/m 2/m) Space Group: P 6/mcc

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

By Intensity(I/I_o): 4.32(1), 3.19(0.81), 4.06(0.57),

Physical Properties of Sugilite

Cleavage:

{0001} Indistinct

Color:

Brownish yellow, Violet, Reddish violet, Pale pink.

Density:

2.74

Diaphaneity:

Transparent to Translucent

Habit:

Granular - Generally occurs as anhedral to subhedral crystals in matrix.

Habit:

Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).

Hardness:

6-6.5 - Orthoclase-Pyrite

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Sugilite

Dichroism (e):

pink.

Dichroism (w):

pale pink.

Gladstone-Dale:

CI meas= 0.064 (Fair) - where the CI = (1-KPDmeas/KC)
CI calc= 0.1 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2082,KPDmeas= 0.2166,KC= 0.2314
Ncalc = 1.63 - 1.66

Optical Data:

Uniaxial (-), e=1.577-1.607, w=1.579-1.611, bire=0.0020-0.0040.

Calculated Properties of Sugilite

Electron Density:

Bulk Density (Electron Density)=2.71 gm/cc
note: Specific Gravity of Sugilite =2.74 gm/cc.

Fermion Index:

Fermion Index = 0.01
Boson Index = 0.99

Photoelectric:

PE_Sugilite= 5.06 barns/electron
U=PE_Sugilite x r_electron= 13.69 barns/cc.

Radioactivity:

GRapi = 43.31 (Gamma Ray American Petroleum Institute Units)
Concentration of Sugilite per GRapi unit = 2.31 (%)

Estimated Radioactivity from Sugilite - barely detectable

Sugilite Classification

Dana Class:

63.02.01a.09 (63)Cyclosilicate Condensed Rings

(63.02)6-membered rings

(63.02.01a)Milarite - Osumilite group (Milarite - Osumilite subgroup)

63.02.01a.01 Brannockite KSn2Li3Si12O30 P 6/mcc 6/m 2/m 2/m

63.02.01a.02 Chayesite K(Mg,Fe)4Fe(Si12O30) P 6/mcc 6/m 2/m 2/m

63.02.01a.03 Darapiosite KNa2Zr[Li(Mn,Zr)2Si12O30] P 6/mcc 6/m 2/m 2/m

63.02.01a.04 Eifelite KNa3Mg4Si12O30 P 6/mcc 6/m 2/m 2/m

63.02.01a.05 Merrihueite (K,Na)2(Fe,Mg)5Si12O30 P 6/mcc 6/m 2/m 2/m

63.02.01a.06 Osumilite-(Fe) (K,Na)(Fe,Mg)2(Al,Fe)3(Si,Al)12O30 P 6/mcc 6/m 2/m 2/m

63.02.01a.07 Osumilite-(Mg) (K,Na)(Mg,Fe)2(Al,Fe)3(Si,Al)12O30 P 6/mcc 6/m 2/m 2/m

63.02.01a.08 Poudretteite KNa2B3Si12O30 P 6/mcc 6/m 2/m 2/m

63.02.01a.09 Sugilite KNa2(Fe,Mn,Al)2Li3Si12O30 P 6/mcc 6/m 2/m 2/m

63.02.01a.10 Yagiite (Na,K)3Mg4(Al,Mg)6(Si,Al)24O60 P 6/mmc 6/m 2/m 2/m

63.02.01a.11 Dusmatovite K(K,Na,[])(Mn,Y,Zr)2(Zn,Li)3Si12O30 P 6/mcc 6/m 2/m 2/m

63.02.01a.12 Milarite K2Ca4Al2Be4Si24O60•(H2O) P 6/mcc 6/m 2/m 2/m

63.02.01a.13 Sogdianite (K,Na)2(Li,Fe,Al)3ZrSi12O30 P 6/mmm 6/m 2/m 2/m

63.02.01a.14 Roedderite (Na,K)2(Mg,Fe)5Si12O30 P 6₃/mmc 6/m 2/m 2/m

63.02.01a.15 Berezanskite! KLi3Ti2Si12O30 P 6/mcc 6/m 2/m 2/m

63.02.01a.16 Shibkovite! K(Ca,Mn,Na)2(K2-x,[]x)2ZnSi12O30(x~0.8) P 6/mcc 6/m 2/m 2/m

63.02.01a.17 Trattnerite! (Fe,Mg)2(Mg,Fe)3(Si12O30) P 6/mcc 6/m 2/m 2/m

63.02.01a.18 Almarudite! K([],Na)2(Mn,Fe,Mg)2(Be,Al)3[Si12O30] P 6/mcc 6/m 2/m 2/m

63.02.01a.19 Oftedalite! (Sc,Ca)2KBe3Si12O30 P 6/mmc 6/m 2/m 2/m

63.02.01a.20 Klochite ([]1Na1)KFe2Zn3[Si12O30] P 6/mcc 6/m 2/m 2/m

63.02.01a.21 Friedrichbeckeite! K([],Na)Mg2(Be2Mg)Si12O30 P 6/mcc 6/m 2/m 2/m

Strunz Class:

09.CM.05 09 - SILICATES (Germanates)

09.C - Cyclosilicates

09.CM -[Si6O18]12- 6-membered double rings (sechser-Doppelringe)

09.CM.05 Brannockite KSn2Li3Si12O30 P 6/mcc 6/m 2/m 2/m

09.CM.05 Armenite BaCa2Al6Si9O30•2(H2O) Pnc2 mm2

09.CM.05 Berezanskite! KLi3Ti2Si12O30 P 6/mcc 6/m 2/m 2/m

09.CM.05 Dusmatovite K(K,Na,[])(Mn,Y,Zr)2(Zn,Li)3Si12O30 P 6/mcc 6/m 2/m 2/m

09.CM.05 Chayesite K(Mg,Fe)4Fe(Si12O30) P 6/mcc 6/m 2/m 2/m

09.CM.05 Shibkovite! K(Ca,Mn,Na)2(K2-x,[]x)2ZnSi12O30(x~0.8) P 6/mcc 6/m 2/m 2/m

09.CM.05 Eifelite KNa3Mg4Si12O30 P 6/mcc 6/m 2/m 2/m

09.CM.05 Darapiosite KNa2Zr[Li(Mn,Zr)2Si12O30] P 6/mcc 6/m 2/m 2/m

09.CM.05 Merrihueite (K,Na)2(Fe,Mg)5Si12O30 P 6/mcc 6/m 2/m 2/m

09.CM.05 Roedderite (Na,K)2(Mg,Fe)5Si12O30 P 6₃/mmc 6/m 2/m 2/m

09.CM.05 Milarite K2Ca4Al2Be4Si24O60•(H2O) P 6/mcc 6/m 2/m 2/m

09.CM.05 Osumilite-(Fe) (K,Na)(Fe,Mg)2(Al,Fe)3(Si,Al)12O30 P 6/mcc 6/m 2/m 2/m

09.CM.05 Osumilite-(Mg) (K,Na)(Mg,Fe)2(Al,Fe)3(Si,Al)12O30 P 6/mcc 6/m 2/m 2/m

09.CM.05 Poudretteite KNa2B3Si12O30 P 6/mcc 6/m 2/m 2/m

09.CM.05 Sugilite KNa2(Fe,Mn,Al)2Li3Si12O30 P 6/mcc 6/m 2/m 2/m

09.CM.05 Sogdianite (K,Na)2(Li,Fe,Al)3ZrSi12O30 P 6/mmm 6/m 2/m 2/m

09.CM.05 Oftedalite! (Sc,Ca)2KBe3Si12O30 P 6/mmc 6/m 2/m 2/m

09.CM.05 Yagiite (Na,K)3Mg4(Al,Mg)6(Si,Al)24O60 P 6/mmc 6/m 2/m 2/m

09.CM.05 Trattnerite! (Fe,Mg)2(Mg,Fe)3(Si12O30) P 6/mcc 6/m 2/m 2/m

09.CM.05 Almarudite! K([],Na)2(Mn,Fe,Mg)2(Be,Al)3[Si12O30] P 6/mcc 6/m 2/m 2/m

Other Sugilite Information

References:

NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Dana8)

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Sugilite

KNa2(Fe+++,Mn+++,Al)2Li3Si12O30
Dana No: 63.02.01a.09 Strunz No: 09.CM.05
Locality:

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