Bobshannonite

Na2KBa(Mn,Na)8(Nb,Ti)4(Si2O7)4O4(OH)4(O,F)2
IMA status
  • Approved
IMA symbol
Bsha
IMA approved
2014
Also known as
  • Bobshannoniet
  • IMA2014-052

Where it forms, where it's found

Geological setting

Alkaline intrusive.

Type locality
Poudrette quarry (De-Mix quarry
  1. Demix quarry
  2. Uni-Mix quarry
  3. Carrière Mont Saint-Hilaire
  4. MSH)
  5. Mont Saint-Hilaire
  6. La Vallée-du-Richelieu RCM
  7. Montérégie
  8. Québec
  9. Canada

45.5628°, -73.1417°

1recorded occurrences
Source · OpenStreetMap

Physical

Hardness
123456789104/ 10 MOHS
  1. 1Talc
  2. 2Gypsum
  3. 3Calcite
  4. 4Fluorite
  5. 5Apatite
  6. 6Orthoclase
  7. 7Quartz
  8. 8Topaz
  9. 9Corundum
  10. 10Diamond
Transparency
Transparent · Translucent
Colour
very pale brown to orange brown

very pale brown

Tenacity
brittle
Cleavage
Very Good

(001)

Fracture
Hackly
Density
3.787 g/cm³

Optical

UV response
None

Crystallography

Crystal system
Triclinic
Cell parameters
a = 10.839(6) Å · b = 13.912(8) Å · c = 20.98(1) Å
Cell angles
α = 89.99(1) ° · β = 95.05(2) ° · γ = 89.998(9) °
Ratio a:b:c
1 : 1.284 : 1.936
Unit cell volume
3151 ų
Z
4
Type-locality form

blocky crystals 0.5–1 mm across

Comment

TS-block mineral. Space group C1¯ abstract gives C1

Crystal structure

Chemical composition

Constituent elements
Mass composition breakdown
ElementAtoms At. mass g/mol Mass g/molMass share
8OOxygenOxygen3815.999607.962
26.62%
25MnManganeseManganese854.938439.504
19.25%
41NbNiobiumNiobium492.906371.624
16.27%
11NaSodiumSodium1022.990229.900
10.07%
14SiSiliconSilicon828.085224.680
9.84%
22TiTitaniumTitanium447.867191.468
8.39%
56BaBariumBarium1137.327137.327
6.01%
19KPotassiumPotassium139.09839.098
1.71%
9FFluorineFluorine218.99837.996
1.66%
1HHydrogenHydrogen41.0084.032
0.18%
Total2283.591100.00%

Mass share = atoms × atomic mass ÷ molar mass × 100

From IMA formula

Synonyms

  • Bobshannoniet
  • IMA2014-052

In other languages

German
Bobshannonit · IMA 2014-052
Italian
bobshannonite

Classification

Strunz
10th ed.

9.BE

  • 9SilicatesClass
  • 9.BSorosilicatesDivision
  • 9.BESi2O7 groups, with additional anions; cations in octahedral [6] and greater coordinationGroup
  • 9.BEBobshannoniteSpecies

Group, growth & confusion

In the same group
7 members

Literature, links & citation

Citations
  1. 2014Williams, P. A., Hatert, F., Pasero, M., Mills, S. J. (2014) IMA Commission on New Minerals, Nomenclature and Classification (CNMNC), CNMNC Newsletter No. 22. Mineralogical Magazine, 78 (5) 1241-1248 doi:10.1180/minmag.2014.078.5.10DOI: 10.1180/minmag.2014.078.5.10
  2. 2015Sokolova, E., Cámara, F., Abdu, Y.A., Hawthorne, F.C., Horváth, L., 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 (7) 1791-1811 doi:10.1180/minmag.2015.079.7.06 DOI: 10.1180/minmag.2015.079.7.06
  3. 2016(2016) Bobshannonite. Handbook of Mineralogy. Mineralogical Society of America
  4. 2016Cámara, Fernando; Gagne, Olivier C.; Uvarova, Yulia; Belakovskiy, Dmitriy I. (2016) New mineral names. American Mineralogist, 101 (9). 2123-2131 doi:10.2138/am-2016-nmn101916DOI: 10.2138/am-2016-nmn101916
  5. 2017Sokolova, E., Cámara, F. (2017) The seidozerite supergroup of TS-block minerals: nomenclature and classification, with change of the following names: rinkite to rinkite-(Ce), mosandrite to mosandrite-(Ce), hainite to hainite-(Y) and innelite-1T to innelite-1A. Mineralogical Magazine, 81 (6) 1457-1484 doi:10.1180/minmag.2017.081.010 DOI: 10.1180/minmag.2017.081.010
Cite this entry
@misc{mineral2026,
  author    = {Mineral Index editorial board},
  title     = {Bobshannonite — Mineral Index},
  year      = {2026},
  url       = {https://mineralindex.org/minerals/bobshannonite-46434},
  note      = {Accessed 2026-05-11}
}