Hibschite Mineral Data

Hibschite Mineral Data +

General Hibschite Information

Chemical Formula:

Ca3Al2(SiO4)3-x(OH)4x(x=0.2-1.5)

Composition:

Molecular Weight = 426.39 gm

Calcium 28.20 % Ca 39.45 % CaO

Aluminum 12.66 % Al 23.91 % Al₂O₃

Silicon 13.17 % Si 28.18 % SiO₂

Hydrogen 0.95 % H 8.45 % H₂O

Oxygen 45.03 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Ca₃Al₂(SiO₄)₂(OH)₄

Environment:

Contact metamorphic and altered igneous rocks.

IMA Status:

Valid Species (Pre-IMA) 1905

Locality:

Marienberg, near Aussig, Bohemia of Czechoslovakia. Link to MinDat.org Location Data.

Synonym:

Hydrogrossular

ICSD 31250

PDF 45-1447

Plazolite

Hibschite Image

Images:

Hibschite

Comments: Deep red translucent dodecahedral crystals of hibschite.
Location: Monte Faiello, Liguria, Italy. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Hibschite Crystallography

Cell Dimensions:

a = 12.01, Z = 8; V = 1,732.32 Den(Calc)= 3.27

Crystal System:

Isometric - HexoctahedralH-M Symbol (4/m 3 2/m) Space Group: I a3d

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

By Intensity(I/I_o): 1.62(1), 2.71(1), 3.03(0.8),

Crystal Structure:

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Lager G A , Armbruster T , Rotella F J , Rossman G R , American Mineralogist , 74 (1989) p.840-851, OH substitution in garnets: X-ray and neutron diffraction, infrared, and, geometric-modeling studies

View Additional jPOWD Structure files for Hibschite
[1]

Physical Properties of Hibschite

Cleavage:

None

Color:

Colorless, White, Pale gray, Brown, Pink.

Density:

3.13

Diaphaniety:

Transparent to translucent

Fracture:

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

Habit:

Crystalline - Fine - Occurs as well-formed fine sized crystals.

Hardness:

6.5 - Pyrite

Luminescence:

Fluorescent.

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Hibschite

Gladstone-Dale:

CI meas= 0.018 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.06 (Fair) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2064,KPDmeas= 0.2157,KC= 0.2197

Optical Data:

Isotropic, n=1.675.

Calculated Properties of Hibschite

Electron Density:

r_electron=3.14 gm/cc
note: r_Hibschite=3.13 gm/cc.

Fermion Index

Fermion Index = 0.00675
Boson Index = 0.99325

Photoelectric:

PE_Hibschite= 4.33 barns/electron
U=PE_Hibschite x r_electron= 13.61 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Hibschite is Not Radioactive

Hibschite Classification

Dana Class:

51.4.3d.1 (51)Nesosilicate Insular SiO4 Groups Only

(51.4)with cations in [6] and >[6] coordination

(51.4.3d)Garnet group (Hydrogarnet)

51.4.3d.1 Hibschite Ca3Al2(SiO4)3-x(OH)4x(x=0.2-1.5) I a3d 4/m 3 2/m

51.4.3d.2 Katoite Ca3Al2(SiO4)3-x(OH)4xx=1.5-3 I a3d 4/m 3 2/m

Strunz Class:

VIII/A.08-80 VIII - Silicates

VIII/A - Nesosilicates with [SiO4]4-groups, cations of octahedral and cubic orientation [8+6]

VIII/A.08 - Garnet group, Pyrope - Henritermierite

VIII/A.08-10 Pyrope Mg3Al2(SiO4)3 I a3d 4/m 3 2/m

VIII/A.08-20 Almandine Fe3Al2(SiO4)3 I a3d 4/m 3 2/m

VIII/A.08-30 Spessartine Mn3Al2(SiO4)3 I a3d 4/m 3 2/m

VIII/A.08-40 Calderite (Mn,Ca)3(Fe,Al)2(SiO4)3 I a3d 4/m 3 2/m

VIII/A.08-50 Knorringite Mg3Cr2(SiO4)3 I a3d 4/m 3 2/m

VIII/A.08-60 Majorite Mg3(Fe,Al,Si)2(SiO4)3 I a3d 4/m 3 2/m

VIII/A.08-70 Grossular Ca3Al2(SiO4)3 I a3d 4/m 3 2/m

VIII/A.08-80 Hibschite Ca3Al2(SiO4)3-x(OH)4x(x=0.2-1.5) I a3d 4/m 3 2/m

VIII/A.08-90 Katoite Ca3Al2(SiO4)3-x(OH)4xx=1.5-3 I a3d 4/m 3 2/m

VIII/A.08-100 Hydrougrandite? (Ca,Mg,Fe)3(Fe,Al)2(SiO4)3-x(OH)4x I a3d 4/m 3 2/m

VIII/A.08-110 Andradite Ca3Fe2(SiO4)3 I a3d 4/m 3 2/m

VIII/A.08-120 Schorlomite Ca3(Ti,Fe,Al)2[(Si,Fe,Fe)O4]3 I a3d 4/m 3 2/m

VIII/A.08-125 Morimotoite Ca3TiFeSi3O12 I a3d 4/m 3 2/m

VIII/A.08-130 Uvarovite Ca3Cr2(SiO4)3 I a3d 4/m 3 2/m

VIII/A.08-138 Yamatoite! (Mn,Ca)3(V,Al)2(SiO4)3 I a3d 4/m 3 2/m

VIII/A.08-140 Goldmanite Ca3(V,Al,Fe)2(SiO4)3 I a3d 4/m 3 2/m

VIII/A.08-150 Kimzeyite Ca3(Zr,Ti)2(Si,Al,Fe)3O12 I a3d 4/m 3 2/m

VIII/A.08-160 Henritermierite Ca3(Mn,Al)2(SiO4)2(OH)4 I 4₁/acd 4/m 2/m 2/m

Other Hibschite Information

References:

NAME( Ford32) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Ford32)

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Hibschite

Ca3Al2(SiO4)3-x(OH)4x(x=0.2-1.5)
Dana No: 51.4.3d.1 Strunz No: VIII/A.08-80
Locality:

Notes: