Indialite Mineral Data

Indialite Mineral Data +

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General Indialite Information

Chemical Formula:

Mg2Al4Si5O18

Composition:

Molecular Weight = 584.95 gm

Magnesium 8.31 % Mg 13.78 % MgO

Aluminum 18.45 % Al 34.86 % Al₂O₃

Silicon 24.01 % Si 51.36 % SiO₂

Oxygen 49.23 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Mg₂Al₄Si₅O₁₈

Environment:

Formed by fusion and recrystallization of sedimentary rocks as a result of the burning of underlying coal seams. High temperature polymorph of cordierite.

IMA Status:

Valid Species (Pre-IMA) 1954

Locality:

Bokaro coal seam, southwest of Hazaribagh, Bihar, India. Link to MinDat.org Location Data.

Name Origin:

Named for the locality

Synonym:

ICSD 200127

PDF 13-293

Indialite Image

Images:

Indialite

Comments: Gray glassy crystalline indialite in rock.
Location: Daimonji yama, Kyoto-shi, Kyoto, Japan. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Images:

Indialite

Comments: SEM images of indialite clusters. (AmMin, 89:3).
Location: Somma-Vesuvius volcano in unusual pyrometamorphic ejecta. Scale: Scale bar 100 µ-m.
© American Mineralogist

Indialite Crystallography

Axial Ratios:

a:c = 1:0.95301

Cell Dimensions:

a = 9.812, c = 9.351, Z = 2; V = 779.66 Den(Calc)= 2.49

Crystal System:

Hexagonal - Dihexagonal DipyramidalH-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): 8.48(1), 3.037(0.55), 4.096(0.55),

Crystal Structure:

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Balassone G , Franco E , Mattia C A , Puliti R , American Mineralogist , 89 (2004) p.1-6, Indialite in xenolithic rocks from Somma-Vesuvius volcano (Southern Italy):, Crystal chemistry and petrogenetic features

View Additional jPOWD Structure files for Indialite
[1] [2]

Physical Properties of Indialite

Cleavage:

None

Color:

Colorless, Pale mauve.

Density:

2.51

Diaphaniety:

Transparent

Fracture:

Conchoidal - Fractures developed in brittle materials characterized by smoothly curving surfaces, (e.g. quartz).

Habit:

Hexagonal - Six-sided crystal shape in cross-section or habit.

Habit:

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

Hardness:

7-7.5 - Quartz-Garnet

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Indialite

Dichroism (e):

none.

Dichroism (w):

none.

Gladstone-Dale:

CI meas= -0.033 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= -0.042 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2152,KPDmeas= 0.2134,KC= 0.2065

Optical Data:

Uniaxial (-), e=1.532-1.535, w=1.537-1.539, bire=0.0040-0.0050.

Calculated Properties of Indialite

Electron Density:

r_electron=2.49 gm/cc
note: r_Indialite=2.51 gm/cc.

Fermion Index

Fermion Index = 0.01975
Boson Index = 0.98025

Photoelectric:

PE_Indialite= 1.65 barns/electron
U=PE_Indialite x r_electron= 4.10 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Indialite is Not Radioactive

Indialite Classification

Dana Class:

61.1.1.3 (61)Cyclosilicate Six-Membered Rings

(61.1)with [Si6O18] rings; possible (OH) and Al substitution

(61.1.1)Beryl group

61.1.1.1 Beryl Be3Al2Si6O18 P 6/mmc 6/m 2/m 2/m

61.1.1.2 Bazzite Be3(Sc,Al)2Si6O18 P 6/mcc 6/m 2/m 2/m

61.1.1.3 Indialite Mg2Al4Si5O18 P 6/mcc 6/m 2/m 2/m

61.1.1.4 Stoppaniite! (Fe,Al,Mg)4(Na,[])2[Be6Si12O36]·2(H2O) P 6/mmc 6/m 2/m 2/m

61.1.1.5 Pezzottaite! Cs(Be2Li)Al2Si6O18 R 3c 3m

Strunz Class:

VIII/E.12-30 VIII - Silicates

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

VIII/E.12 - Beryl series

VIII/E.12-10 Beryl Be3Al2Si6O18 P 6/mmc 6/m 2/m 2/m

VIII/E.12-20 Bazzite Be3(Sc,Al)2Si6O18 P 6/mcc 6/m 2/m 2/m

VIII/E.12-25 Stoppaniite! (Fe,Al,Mg)4(Na,[])2[Be6Si12O36]·2(H2O) P 6/mmc 6/m 2/m 2/m

VIII/E.12-30 Indialite Mg2Al4Si5O18 P 6/mcc 6/m 2/m 2/m

VIII/E.12-40 Cordierite Mg2Al4Si5O18 C ccm 2/m 2/m 2/m

VIII/E.12-50 Sekaninaite (Fe,Mg)2Al4Si5O18 C ccm 2/m 2/m 2/m

Other Indialite Information

References:

NAME( AntBidBlaNic2) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic2)

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Indialite

Mg2Al4Si5O18
Dana No: 61.1.1.3 Strunz No: VIII/E.12-30
Locality:

Notes: