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Muirite

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About MuiriteHide

John Muir
Formula:
Ba10Ca2Mn2+Ti[(OH,Cl,F)|HSi2O7]5
Colour:
Orange
Lustre:
Sub-Vitreous
Hardness:
Specific Gravity:
3.86
Crystal System:
Tetragonal
Name:
Named by J.T. Alfors, M.C. Stinson, R.A. Matthews, and A. Pabst in 1965 in honor of John Muir (21 April 1838, Dunbar, Scotland - 24 December 1914, Los Angeles, California, US), also known as "John of the Mountains". Muir was a geologist and explorer, naturalist, author, environmental philosopher, and glaciologist. He was an early advocate for the preservation of wilderness in the United States and founded the Sierra Club.
This page provides mineralogical data about Muirite.


Classification of MuiriteHide

Approved
Approval Year:
1964
First Published:
1965
9.CN.05

9 : SILICATES (Germanates)
C : Cyclosilicates
N : [Si8O24]16- 8-membered rings
62.1.1.1

62 : CYCLOSILICATES Eight-Membered Rings
1 : Eight-Membered Rings with 8-membered and larger rings
17.3.18

17 : Silicates Containing other Anions
3 : Silicates with chloride (including aluminosilicates)

Physical Properties of MuiriteHide

Sub-Vitreous
Transparency:
Transparent, Translucent
Colour:
Orange
Streak:
Pale orange
Hardness:
2½ on Mohs scale
Cleavage:
Poor/Indistinct
Indistinct on {001} and {100}
Density:
3.86(2) g/cm3 (Measured)    3.88 g/cm3 (Calculated)

Optical Data of MuiriteHide

Type:
Uniaxial (+)
RI values:
nω = 1.697 nε = 1.704
Max Birefringence:
δ = 0.007
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
High
Pleochroism:
Visible
Comments:
O = orange
E = colorless

Chemical Properties of MuiriteHide

Formula:
Ba10Ca2Mn2+Ti[(OH,Cl,F)|HSi2O7]5
IMA Formula:
Ba10Ca2Mn2+TiSi10O30(OH,Cl,F)10
Common Impurities:
Al,Fe,Mg,Sr,K,H2O

Crystallography of MuiriteHide

Crystal System:
Tetragonal
Class (H-M):
4/mmm (4/m 2/m 2/m) - Ditetragonal Dipyramidal
Space Group:
P4/mmm
Cell Parameters:
a = 14.000(3) Å, c = 5.625(2) Å
Ratio:
a:c = 1 : 0.402
Unit Cell V:
1,102.50 ų (Calculated from Unit Cell)
Z:
1
Morphology:
Subhedral to euhedral crystals not uncommon.

The common forms are {001} and {100}; other forms include {110} and a few (h01) faces.

Type Occurrence of MuiriteHide

Place of Conservation of Type Material:
California Divisions of Mines & Geology
Geological Setting of Type Material:
sanbornite-quartz-bearing metamorphic rock

Synonyms of MuiriteHide

Other Language Names for MuiriteHide

German:Muirit
Russian:Мюирит
Spanish:Muirita

Common AssociatesHide

Associated Minerals Based on Photo Data:
Sanbornite2 photos of Muirite associated with Sanbornite on mindat.org.
Uvarovite1 photo of Muirite associated with Uvarovite on mindat.org.

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

17.3.1RustumiteCa10(Si2O7)2(SiO4)(OH)2Cl2Mon.
17.3.2ZunyiteAl13Si5O20(OH,F)18ClIso. 4 3m : F4 3m
17.3.3SodaliteNa8(Al6Si6O24)Cl2Iso. 4 3m : P4 3n
17.3.4MarialiteNa4Al3Si9O24ClTet. 4/m : I4/m
17.3.5TugtupiteNa4BeAlSi4O12ClTet. 4 : I4
17.3.6EudialyteNa15Ca6(Fe2+,Mn2+)3Zr3[Si25O73](O,OH,H2O)3(OH,Cl)2Trig. 3m (3 2/m) : R3m
17.3.7AlluaiviteNa19(Ca,Mn)6(Ti,Nb)3Si26O74Cl · 2H2OTrig. 3m (3 2/m) : R3m
17.3.8NasonitePb6Ca4(Si2O7)3Cl2Hex.
17.3.9AsisitePb7SiO9Cl2 Tet. 4/mmm (4/m 2/m 2/m) : I4/mmm
17.3.10JagoitePb18Fe3+4[Si4(Si,Fe3+)6][Pb4Si16(Si,Fe)4]O82Cl6Hex.
17.3.11FriedeliteMn2+8Si6O15(OH,Cl)10Mon. 2/m : B2/m
17.3.12Pyrosmalite-(Fe)Fe2+8Si6O15(OH,Cl)10Trig. 3m (3 2/m) : P3m1
17.3.13Pyrosmalite
17.3.14Pyrosmalite-(Mn)Mn2+8Si6O15(OH,Cl)10Trig.
17.3.16Mcgillite(Mn,Fe)8Si6O15(OH)8Cl2Mon. 2/m : B2/m
17.3.17TraskiteBa21Ca(Fe2+,Mn,Ti)4(Ti,Fe,Mg)12(Si12O36)(Si2O7)6(O,OH)30Cl6·14H2O Hex.
17.3.19VerplanckiteBa2(Mn,Fe,Ti)Si2O6(O,OH,Cl,F)2 · 3H2O or nearHex.

Fluorescence of MuiriteHide

Other InformationHide

Thermal Behaviour:
Gives off water in a closed test tube and fuses at about 3.
Notes:
Decomposed by dilute hydrochloric and nitric acids. Loses its color and disintegrates to a white or colorless residue. Not affected by sulfuric acid, acetic acid, or concentrated sodium hydroxide.
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for MuiriteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Alfors, J.T., Stinson, M.C., Matthews, R.A., Pabst, A. (1965) Seven new barium minerals from eastern Fresno County, California. American Mineralogist: 50: 314-340.
Alfors, J.T., Putnam, G.W. (1965) Revised chemical analyses of traskite, verplanckite and muirite from Fresno County, California. American Mineralogist: 50: 1500-1503.
Khan, A.A., Baur, W.H. (1971) Eight-membered cyclosilicate rings in muirite. Science: 173: 916-918.
Malinovskii, Y.A., Pobedimskaya, E.A., Belov, N.V. (1975) Crystal structure of muirite Ba9(Ca,Ba)(Ca,Ti)4(OH)8[Si8O24](Cl,OH)8. Soviet Physics - Doklady: 20: 163-164.
Alfors, J.T., Pabst, A. (1984) Titanian taramellites in western North America. American Mineralogist: 69: 358-373.

Internet Links for MuiriteHide

Localities for MuiriteHide

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Canada
 
  • Yukon
    • Watson Lake mining district
      • Itsi Mt.
        • Wilson Lake
Handbook of Mineralogy; Alfors, J.T. & Pabst, A. (1984): Titanian taramellites in western North America, American Mineralogist, 69, 358-373.
USA (TL)
 
  • California
    • Fresno Co.
      • Big Creek-Rush Creek District
        • Rush Creek deposit
          • Big Creek
Matthews, Robert Alfred & John T. Alfors (1962), Sanbornite from Rush Creek, Fresno County: California Division Mines & Geology Mineral Information Service: 15(6): 1-3; Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 465; American Mineralogist (1965) 50, 314-340; Mineralogical Record (2002): 33: 161.
Canadian Mineralogist22:653-658
Mineral and/or Locality  
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