Muirite Mineral Data

General Muirite Information

Chemical Formula:

Ba10Ca2Mn++TiSi10O30(OH,Cl,F)10

Composition:

Molecular Weight = 2,526.04 gm

Barium 54.36 % Ba 60.70 % BaO

Calcium 3.17 % Ca 4.44 % CaO

Titanium 1.90 % Ti 3.16 % TiO₂

Manganese 2.17 % Mn 2.81 % MnO

Silicon 11.12 % Si 23.79 % SiO₂

Hydrogen 0.28 % H 2.50 % H₂O

Chlorine 2.81 % Cl 2.81 % Cl

- % Cl -0.63 % -O=Cl₂

Oxygen 23.44 % O

Fluorine 0.75 % F 0.75 % F

- % F -0.32 % -O=F₂

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Ba₁₀Ca₂Mn²⁺TiSi₁₀O₃₀(OH)₇Cl₂F

IMA Status:

Approved IMA 1965

Locality:

Big Creek - Rush Creek sanbornite deposit, 5 miles NE of Trimmer, Fresno Co., California. Link to MinDat.org Location Data.

Name Origin:

Named for John Muir (1838-1914), American geologist and explorer who made early observations in geology in the Sierra Nevada Mountains, California, USA.

Name Pronunciation:

Muirite

Synonym:

ICSD 23533

PDF 18-161

Muirite Image

Images:

Muirite Sanbornite

Comments: Translucent orange crystalline muirite in sanbornite.
Location: Big Creek, Fresno County, California, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Muirite Crystallography

Axial Ratios:

a:c = 1:0.40178

Cell Dimensions:

a = 14, c = 5.625, Z = 1; V = 1,102.50 Den(Calc)= 3.80

Crystal System:

Tetragonal - Ditetragonal DipyramidalH-M Symbol (4/m 2/m 2/m) Space Group: P 4/mmm

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

By Intensity(I/I_o): 2.91(1), 4.42(0.75), 3.73(0.6),

Physical Properties of Muirite

Cleavage:

{001} Indistinct, {100} Indistinct

Color:

Orange, Brown.

Density:

3.86

Habit:

Anhedral Grains - Granular minerals without the expression of crystal shapes

Hardness:

2.5 - Finger Nail

Luster:

Vitreous (Glassy)

Streak:

light orange

Optical Properties of Muirite

Dichroism (e):

orange.

Dichroism (w):

colorless.

Gladstone-Dale:

CI meas= -0.054 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= -0.071 (Fair) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1843,KPDmeas= 0.1815,KC= 0.1722
Ncalc = 1.65 - 1.66

Optical Data:

Uniaxial (+), w=1.697, e=1.704, bire=0.0070.

Calculated Properties of Muirite

Electron Density:

Bulk Density (Electron Density)=3.46 gm/cc
note: Specific Gravity of Muirite =3.86 gm/cc.

Fermion Index:

Fermion Index = 0.1
Boson Index = 0.9

Photoelectric:

PE_Muirite= 244.96 barns/electron
U=PE_Muirite x rElectron Density= 848.20 barns/cc.

Radioactivity:

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

Muirite Classification

Dana Class:

62.01.01.01 (62)Cyclosilicate Eight-Membered Rings

(62.01)with 8-memebered and larger rings

(62.01.01)Muirite Group

62.01.01.01 Muirite Ba10Ca2MnTiSi10O30(OH,Cl,F)10 P 4/mmm 4/m 2/m 2/m

62.01.01.02 Cerchiaraite! Ba4(Mn,Fe,Al)4Si6(O,OH,Cl)26 I 4/mmm 4/m 2/m 2/m

Strunz Class:

09.CN.05 09 - SILICATES (Germanates)

09.C - Cyclosilicates

09.CN -[Si8O24]16- 8-membered rings

09.CN.05 Muirite Ba10Ca2MnTiSi10O30(OH,Cl,F)10 P 4/mmm 4/m 2/m 2/m

Other Muirite Information

References:

NAME( MinRec) PHYS. PROP.(Dana8) OPTIC PROP.(Dana8)

See Also:

Links to other databases for Muirite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info
15 - WWW-MINCRYST

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

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

Muirite

Ba10Ca2Mn++TiSi10O30(OH,Cl,F)10
Dana No: 62.01.01.01 Strunz No: 09.CN.05
Locality:

Notes: