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Bobshannonite

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About BobshannoniteHide

Formula:
Na2KBa(Mn,Na)8(Nb,Ti)4(Si2O7)4O4(OH)4(O,F)2
Colour:
very pale brown to orange brown
Lustre:
Vitreous
Hardness:
4
Specific Gravity:
3.787 (Calculated)
Crystal System:
Triclinic
Name:
After Dr. Robert (Bob) D. Shannon (b. 1935), in recognition of his major contributions to the field of crystal chemistry in particular and mineralogy in general through his development of accurate and comprehensive ionic radii and his work on dielectric properties of minerals.
The Nb analogue of perraultite.


Classification of BobshannoniteHide

Approved
Approval Year:
2014

Physical Properties of BobshannoniteHide

Vitreous
Transparency:
Transparent, Translucent
Colour:
very pale brown to orange brown
Comment:
very pale brown
Hardness:
Tenacity:
Brittle
Cleavage:
Very Good
{001}
Fracture:
Hackly
Density:
3.787 g/cm3 (Calculated)

Chemical Properties of BobshannoniteHide

Formula:
Na2KBa(Mn,Na)8(Nb,Ti)4(Si2O7)4O4(OH)4(O,F)2
IMA Formula:
KBaNa2(Mn,Na)8(Nb,Ti)4(Si2O7)4O4(OH)4(O,F)2

Crystallography of BobshannoniteHide

Crystal System:
Triclinic
Cell Parameters:
a = 10.839(6) Å, b = 13.912(8) Å, c = 20.98(1) Å
α = 89.99(1)°, β = 95.05(2)°, γ = 89.998(9)°
Ratio:
a:b:c = 0.779 : 1 : 1.508
Unit Cell V:
3151 ų
Z:
4
Comment:
TS-block mineral. Space group C1¯ abstract gives C1

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
10.493(25)
6.612(25)
3.477(60)
3.193(59)
2.873(100)
2.648(40)
2.608(35)
1.776(30)
Comments:
From Type Description.

Type Occurrence of BobshannoniteHide

General Appearance of Type Material:
blocky crystals 0.5–1 mm across
Place of Conservation of Type Material:
Type material is deposited in the collections of the Canadian Museum of Nature, Ottawa, Canada, registration number CMNMC 86886
Geological Setting of Type Material:
Alkaline intrusive.
Associated Minerals at Type Locality:

Synonyms of BobshannoniteHide

Relationship of Bobshannonite to other SpeciesHide

Other Members of this group:
JinshajiangiteBaNaFe2+4Ti2(Si2O7)2O2(OH)2FTric. 1 : P1
PerraultiteBaNaMn2+4Ti2(Si2O7)2O2(OH)2FMon. 2/m : B2/m
SurkhobiteNaCaBa2Mn8Ti4(Si2O7)4O5F5

Fluorescence of BobshannoniteHide

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 BobshannoniteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Sokolova, E., Cámara, F., Hawthorne, F.C., Horváth, L. and Pfenninger-Horváth, E. (2015): Bobshannonite, Na2KBa(Mn,Na)8(Nb,Ti)4(Si2O7)4O4(OH)4(O,F)2, a new TS-block mineral from Mont Saint-Hilaire, Québec, Canada: Description and crystal structure. Mineralogical Magazine 79, 1791-1811.

Internet Links for BobshannoniteHide

Localities for BobshannoniteHide

ⓘ - 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 (TL)
 
  • Québec
    • Montérégie
      • La Vallée-du-Richelieu RCM
        • Mont Saint-Hilaire
Sokolova, E., Cámara, F., Hawthorne, F.C., Horváth, L. and Pfenninger- Horváth, E. (2015): Bobshannonite, Na2KBa(Mn,Na)8(Nb,Ti)4(Si2O7)4O4(OH)4(O,F)2, a new TS-block mineral from Mont Saint-Hilaire, Québec, Canada: Description and crystal structure. Mineralogical Magazine 79, 1791-1811.
Mineral and/or Locality  
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