Hubeite Mineral Data

General Hubeite Information

Chemical Formula:

Ca2Mn++Fe+++Si4O12(OH)(H2O)2

Composition:

Molecular Weight = 544.27 gm

Calcium 15.61 % Ca 21.84 % CaO

Manganese 8.78 % Mn 11.34 % MnO

Aluminum 0.20 % Al 0.37 % Al₂O₃

Iron 9.75 % Fe 13.94 % Fe₂O₃

Silicon 20.64 % Si 44.16 % SiO₂

Hydrogen 0.93 % H 8.28 % H₂O

Oxygen 44.09 % O

______ ______

100.00 % 99.93 % = TOTAL OXIDE

Empirical Formula:

Ca₂Mn²⁺_0.87Ca_0.12Fe³⁺_0.95Al_0.04Si₄O₁₂(OH)·2(H₂O)

Environment:

Mildly oxidizing conditions in a calc-manganese silicate skarn. 4-membered silicate rings; structure

IMA Status:

Approved IMA 2002 (Dana # Added)

Locality:

Dayan mine near Huangshi, Hubei Province, China. Link to MinDat.org Location Data.

Name Origin:

Named after the locality.

Synonym:

IMA2000-022

Hubeite Image

Images:

Hubeite Inesite

Comments: Brown hubeite aggregates accompanied by prismatic pinkish inesite crystals.
Location: Fengjiashan Mine, Daye, Hubei China. Scale: 5.3 x 3.7 x 1.1 cm.
© Fabre Minerals

Images:

Hubeite Inesite

Comments: Translucent, deep root beer brown, platy hueite crystals in fan-like groups to 1mm with delicate pink laths of inesite.
Location: Fengjiashan Mine, Daye Co., Huangshi Prefecture, Hubei Province, China. Scale: Picture Size 5 mm.
© Tom Loomis / Dakota Matrix

Hubeite Crystallography

Axial Ratios:

a:b:c =0.7178:1:0.4729

Cell Dimensions:

a = 9.96, b = 13.875, c = 6.562, Z = 2; alpha = 133.19°, beta = 101.5°, gamma = 66.27° V = 593.11 Den(Calc)= 3.05

Crystal System:

Triclinic - PinacoidalH-M Symbol ( 1) Space Group: P1

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

By Intensity(I/I_o): 9.072(1)(100), 8.238(0.9)(110), 3.095(0.7)(142), 3.126(0.7)(320), 2.781(0.6)(220), 1.627(0.3)(154,173),

Forms:

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Forms: ( 3 5 2) ( 0 1 1) ( 1 0 1) ( 1 0 0) ( 0 0 1)

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Physical Properties of Hubeite

Cleavage:

{001} Good

Color:

Dark brown, Light brown.

Density:

3.02

Diaphaneity:

Transparent

Fracture:

Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.

Habit:

Aggregates - Made of numerous individual crystals or clusters.

Habit:

Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite)

Habit:

Rosette - Bundled tabular aggregates resembling rose flower petals.

Hardness:

5.5 - Knife Blade

Luster:

Vitreous (Glassy)

Streak:

pale orange brown

Optical Properties of Hubeite

Gladstone-Dale:

CI meas= 0.035 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.032 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2255,KPDmeas= 0.2247,KC= 0.2329
Ncalc = 1.7

Optical Data:

Biaxial (-), a=1.667, b=1.679, g=1.69, bire=0.0230

Calculated Properties of Hubeite

Electron Density:

Bulk Density (Electron Density)=2.99 gm/cc
note: Specific Gravity of Hubeite =3.01 gm/cc.

Fermion Index:

Fermion Index = 0.01
Boson Index = 0.99

Photoelectric:

PE_Hubeite= 7.79 barns/electron
U=PE_Hubeite x rElectron Density= 23.30 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Hubeite is Not Radioactive

Hubeite Classification

Dana Class:

57.02.03.02 (57)Sorosilicate Insular Si3O10 and Larger Noncyclic Groups

(57.02)with [Si4O13] groups

(57.02.03)Akatoreite Group

57.02.03.01 Akatoreite (Mn,Fe)9Al2Si8O24(OH)8 P1 1

57.02.03.02 Hubeite! Ca2MnFeSi4O12(OH)(H2O)2 P1 1

57.02.03.03 Cassagnaite! (Ca,Mn)4(Fe,Mn,Al)4(OH)4(V,Mg,Al)2(O,OH)4(Si3O10)(SiO4)2 C mcm 2/m 2/m 2/m

Strunz Class:

09.BJ.60 09 - SILICATES (Germanates)

09.B - Sorosilicates

09.BJ -Sorosilicates with Si3O10, Si4O11, etc

09.BJ.60 Hubeite! Ca2MnFeSi4O12(OH)(H2O)2 P1 1

Other Hubeite Information

References:

NAME( MinRec, Vol 33, p 465) PHYS. PROP.(MinRec, Vol 33, p 465) OPTIC PROP.(MinRec, Vol 33, p 465)

See Also:

Links to other databases for Hubeite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - MinDAT
7 - Mineralienatlas (Deutsch)
8 - Online Mineral Museum
9 - QUT Mineral Atlas
10 - Ruff.Info

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Ask about Hubeite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
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Mineral Discussion Forum from Fabre Minerals - also available in Español

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

Hubeite

Ca2Mn++Fe+++Si4O12(OH)(H2O)2
Dana No: 57.02.03.02 Strunz No: 09.BJ.60
Locality:

Notes: