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Magbasite

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Formula:
KBaFe3+Mg7Si8O22(OH)2F6
Originally assumed to be considerably Sc-bearing.
Hardness:
5
Crystal System:
Orthorhombic
Name:
Named by I.E. Semenov, A.R. Khomyakov, A.V. Bukova in 1965 for the chemical composition that includes the elements MAGnesium and BArium.
Structurally related to carpholite.


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Classification of MagbasiteHide

Approved
9.HA.25

9 : SILICATES (Germanates)
H : Unclassified silicates
A : With Alkali and Alkali-earth Elements
69.2.1c.1

69 : INOSILICATES Chains with Side Branches or Loops
2 : Chains with Side Branches or Loops with P>2
17.2.10

17 : Silicates Containing other Anions
2 : Silicates with fluoride

Physical Properties of MagbasiteHide

Hardness:

Optical Data of MagbasiteHide

Type:
Biaxial (-)
RI values:
nα = 1.597 nβ = 1.609 nγ = 1.615
2V:
Measured: 70° , Calculated: 70°
Max Birefringence:
δ = 0.018
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Moderate
Dispersion:
r < v weak

Chemical Properties of MagbasiteHide

Formula:
KBaFe3+Mg7Si8O22(OH)2F6

Originally assumed to be considerably Sc-bearing.
Common Impurities:
Ca

Crystallography of MagbasiteHide

Crystal System:
Orthorhombic
Class (H-M):
mmm (2/m 2/m 2/m) - Dipyramidal
Space Group:
Cmma
Cell Parameters:
a = 18.9506(3) Å, b = 22.5045(3) Å, c = 5.2780(1) Å
Ratio:
a:b:c = 0.842 : 1 : 0.235
Unit Cell V:
2250.93 ų
Z:
4
Comment:
Space group Cmme (Cmma).

Crystal StructureHide

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IDSpeciesReferenceLinkYearLocalityPressure (GPa)Temp (K)
0020127MagbasiteWelch M D, Mitchell R H, Kampf A R, Chakhmouradian, Smith D, Carter M (2014) Crystal structure and topological affinities of magbasite, KBaFe3+Mg7Si8O22(OH)2F6: a trellis structure related to amphibole and carpholite Mineralogical Magazine 78 29-452014Eldor carbonatite complex, Labrador Trough, Quebec, Canada0293
CIF Raw Data - click here to close

Type Occurrence of MagbasiteHide

Other Language Names for MagbasiteHide

German:Magbasit
Spanish:Magbasita

Related Minerals - Nickel-Strunz GroupingHide

9.HA.05ErtixiiteNa2Si4O9Iso.
9.HA.10KenyaiteNa2Si22O41(OH)8 · 6H2OMon.
9.HA.20WawayandaiteCa6Mn2BBe9Si6O23(OH,Cl)15Mon.
9.HA.30AfanasyevaiteCa8[Si2O7]OCl2
9.HA.40IgumnoviteCa3Al2(SiO4)2Cl4Iso.
9.HA.50RudenkoiteSr3(Al3.5Si3.5)O10(OH,O)8Cl2 · H2OMon.
9.HA.55FoshallasiteCa3[Si2O7] · 3H2O(?)
9.HA.60NagelschmidtiteCa7(SiO4)2(PO4)2Hex. 6 : P61
9.HA.65Caryochroite(Na,Sr)3(Fe3+,Mg)10[Ti2Si12O37] · (H2O,O,OH)17Mon.
9.HA.70JuaniteCa10Mg4Al2Si11O39 · 4H2O or near
9.HA.75TacharaniteCa12Al2Si18O33 (OH)36Mon.
9.HA.80OyeliteCa10Si8B2O29 · 12.5H2OOrth.
9.HA.85DenisoviteK14+x(Ca,Na,Mn,Fe)48[Si60O162]F16(Ox,OH4−x)·2H2OMon.
9.HA.90Tiettaite(Na,K)17FeTiSi16O29(OH)30 · 2H2OOrth. mmm (2/m 2/m 2/m) : Cmcm

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

17.2.1TopazAl2(SiO4)(F,OH)2Orth. mmm (2/m 2/m 2/m)
17.2.2PolylithioniteKLi2Al(Si4O10)(F,OH)2Mon. 2/m : B2/b
17.2.3Leifite(Na,H2O)Na6[Be2Al2(Al,Si)Si15O39]F2Trig. 3m : P3m1
17.2.5Meliphanite(Ca,Na)2(Be,Al)[Si2O6(OH,F)]Tet. 4 : I4
17.2.6SarcoliteNa4Ca12Al8Si12O46(SiO4,PO4)(OH,H2O)4(CO3,Cl)Tet.
17.2.7GötzeniteNaCa6Ti(Si2O7)2OF3Tric. 1 : P1
17.2.8Kuliokite-(Y)Y4Al(SiO4)2(OH)2F5Tric. 1 : P1
17.2.9Zinnwaldite

Other InformationHide

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 MagbasiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Semenov, I.E., Khomyakov, A.R., Bukova, A.V. (1965) Magbasite - New mineral. Doklady Akademii Nauk SSSR: 163(3): 718-719. (in Russian)
Fleischer, M. (1966) New mineral names. American Mineralogist: 51: 530.
International Mineralogical Association (1968) International Mineralogical Association: Commission on new minerals and mineral names. Mineralogical Magazine: 36: 1143-1145.
(1979) Contributions to Mineralogy and Petrology: 69: 249.
Welch, M.D., Mitchell, R.H., Kampf, A.R., Chakhmouradian, A.R., Smith, D., Carter, M. (2014) Crystal structure and topological affinities of magbasite, KBaFe3+Mg7Si8O22(OH)2F6: a trellis structure related to amphibole and carpholite. Mineralogical Magazine: 78: 29-45.
Cámara, F., Gagne, O.C., Uvarova, Y., Belakovskiy, D.I. (2014) New mineral names. American Mineralogist: 99: 2437-2444.

Internet Links for MagbasiteHide

Localities for MagbasiteHide

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
 
  • Québec
    • Nord-du-Québec
      • Nunavik
Mitchell, R.H. & Smith, D.L. (2017) Geology and mineralogy of the Ashram zone carbonatite, Eldor complex, Quebec. Ore Geology Reviews 86, 784-806.
China (TL)
 
  • Inner Mongolia
    • Baotou City (Baotou Prefecture)
      • Bayan Obo mining district
        • Bayan Obo
Semenov, I. E., A. R Khomyakov, and A. V. Bukova (1965): Doklady Akademii Nauk SSSR 163(3), 718-719
 
Mineral and/or Locality  
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