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Muirite

A valid IMA mineral species
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About MuiriteHide

05509080014948767535196.jpg
John Muir
Formula:
Ba10Ca2Mn2+Ti[HSi2O7]5(OH,Cl,F)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.


Unique IdentifiersHide

Mindat ID:
2804
Long-form identifier:
mindat:1:1:2804:8
GUID
(UUID V4):
524c18b3-1d4b-4fb1-87fe-375c82f59fec

IMA Classification of MuiriteHide

Approved
IMA Formula:
Ba10Ca2Mn2+TiSi10O30(OH,Cl,F)10
Approval year:
1964
First published:
1965

Classification of MuiriteHide

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)

Mineral SymbolsHide

As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.

SymbolSourceReference
MuiIMA–CNMNCWarr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43

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

Chemistry of MuiriteHide

Mindat Formula:
Ba10Ca2Mn2+Ti[HSi2O7]5(OH,Cl,F)5
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.

Crystal StructureHide

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IDSpeciesReferenceLinkYearLocalityPressure (GPa)Temp (K)
0020849MuiriteKhan A A, Baur W H (1971) Eight-membered cyclosilicate rings in muirite Science 173 916-9181971Esquire No. 7 mine, Big Creek, Fresno County, California0293
0018352MuiriteMalinovskii 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 20 163-1641975Big Creek, Fresno County, California, USA0293
CIF Raw Data - click here to close

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
2.91 Å(100)
4.42 Å(75)
3.73 Å(60)
3.51 Å(60)
3.31 Å(60)
3.60 Å(50)
2.814 Å(40)
2.743 Å(40)
2.154 Å(40)
2.094 Å(40)
10.0 Å(25)
2.607 Å(25)
2.214 Å(25)
2.042 Å(25)
Comments:
Esquire No. 7 claim, California, USA.

Geological EnvironmentHide

Paragenetic Mode(s):
Paragenetic ModeEarliest Age (Ga)
High-𝑇 alteration and/or metamorphism
32 : Ba/Mn/Pb/Zn deposits, including metamorphic deposits

Type Occurrence of MuiriteHide

General Appearance of Type Material:
Anhedral grains. Also subhedral to euhedral tetragonal crystals averaging 0.5 mm and up to 3 mm in size.
Place of Conservation of Type Material:
California Divisions of Mines & Geology, USA.
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:
5 photos of Muirite associated with SanborniteBa2(Si4O10)
3 photos of Muirite associated with QuartzSiO2
2 photos of Muirite associated with Cerchiaraite-(Fe)Ba4Fe3+4O3(OH)3(Si4O12)[Si2O3(OH)4]Cl
2 photos of Muirite associated with PyrrhotiteFe1-xS
1 photo of Muirite associated with UvaroviteCa3Cr2(SiO4)3

Related Minerals - Strunz-mindat GroupingHide

9.CN.05FerrimuiriteBa10(Ca2Fe3+2)[Si8O24]O2Cl10Tet. 4mm : P4mm

Fluorescence of MuiriteHide

Other InformationHide

Thermal Behaviour:
Gives off water in a closed test tube and fuses at about 3.

Heated rapidly to 900 °C in an electric furnace, it turns brown. Further heating turns it pinkish and it partially melts at 1100 °C. At 1200 °C it completely melts to a pale lavender glass.
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.

Internet Links for MuiriteHide

References 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 references and 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 (e.g. from pseudomorphs).

All localities listed without proper references should be considered as questionable.
Canada
 
  • Yukon
    • Watson Lake mining district
      • Itsi Mountain
        • Wilson Lake
Alfors et al. (1984) +2 other references
USA (TL)
 
  • California
    • Fresno County
      • Big Creek-Rush Creek Mining District
        • Big Creek
Van Nostrand Reinholt Press: 465. +5 other references
Canadian Mineralogist22:653-658
 
Mineral and/or Locality  
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