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Yofortierite

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Formula:
Mn5Si8O20(OH)2 · 8-9H2O
System:
Monoclinic
Colour:
Pink to pale violet, ...
Name:
Named in honor of Yves Oscar Fortier (1914-2014), Director of the Geological Survey of Canada (1964-1973), for his many contributions to Canadian geosciences.
This page provides mineralogical data about Yofortierite.

Classification of Yofortierite

Approved 1974
9.EE.20

9 : SILICATES (Germanates)
E : Phyllosilicates
E : Single tetrahedral nets of 6-membered rings connected by octahedral nets or octahedral bands
74.3.1a.3

74 : PHYLLOSILICATES Modulated Layers
3 : Modulated Layers with joined strips
14.17.10

14 : Silicates not Containing Aluminum
17 : Silicates of Mn
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First Recorded Occurrence of Yofortierite

Year of Discovery:
1974

Physical Properties of Yofortierite

Silky, Dull
Colour:
Pink to pale violet, brown

Crystallography of Yofortierite

Crystal System:
Monoclinic
Cell Parameters:
a = 12.75Å, b = 18.36Å, c = 5.02Å
β = 91.98°
Ratio:
a:b:c = 0.694 : 1 : 0.273
Unit Cell Volume:
V 1,174.43 ų (Calculated from Unit Cell)

Optical Data of Yofortierite

Type:
Biaxial
RI values:
nα = 1.530 nγ = 1.559
Max Birefringence:
δ = 0.029
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
Moderate
Dispersion:
weak

Chemical Properties of Yofortierite

Formula:
Mn5Si8O20(OH)2 · 8-9H2O
Essential elements:
All elements listed in formula:
Common Impurities:
Ti,Al,Cr,Zn,Ca,K

Relationship of Yofortierite to other Species

Other Members of Group:
Palygorskite(Mg,Al)5(Si,Al)8O20(OH)2 · 8H2O
TuperssuatsiaiteNa2Fe3Si8O20(OH)2 · 4H2O
Unnamed (Na-Ca-Fe-Silicate-Hydrate)NaCa(Fe2+,Al,Mn)5[Si8O19(OH)](OH)7 · 5H2O
WindhoekiteCa2Fe3+2.67[Si8O20](OH)4 · 10H2O
9.EE.05BementiteMn7Si6O15(OH)8
9.EE.10BrokenhilliteMn8Si6O15(OH)10
9.EE.10Pyrosmalite-(Fe)(Fe,Mn)8Si6O15(OH,Cl)10
9.EE.10Friedelite(Mn,Fe)8Si6O15(OH,Cl)10
9.EE.10Pyrosmalite-(Mn)(Mn,Fe)8Si6O15(OH,Cl)10
9.EE.10Mcgillite(Mn,Fe)8Si6O15(OH)8Cl2
9.EE.15Nelenite(Mn,Fe)16(Si12O30)(OH)14[As33+O6(OH)3]
9.EE.15Schallerite(Mn,Fe)16Si12As3O36(OH)17
9.EE.20Palygorskite(Mg,Al)5(Si,Al)8O20(OH)2 · 8H2O
9.EE.20TuperssuatsiaiteNa2Fe3Si8O20(OH)2 · 4H2O
9.EE.20WindhoekiteCa2Fe3+2.67[Si8O20](OH)4 · 10H2O
9.EE.25Falcondoite(Ni,Mg)4Si6O15(OH)2 · 6H2O
9.EE.25LoughliniteNa2Mg3Si6O16 · 8H2O
9.EE.25SepioliteMg4(Si6O15)(OH)2 · 6H2O
9.EE.25Kalifersite(K,Na)5Fe73+Si20O50(OH)6 · 12H2O
9.EE.30GyroliteNaCa16Si23AlO60(OH)8 · 14H2O
9.EE.30OrlymaniteCa4Mn3Si8O20(OH)6 · 2H2O
9.EE.30TungusiteCa4Fe2Si6O15(OH)6
9.EE.35Reyerite(Na,K)2Ca14(Si,Al)24O58(OH)8 · 6H2O
9.EE.35Truscottite(Ca,Mn)14Si24O58(OH)8 · 2H2O
9.EE.40NatrosiliteNa2Si2O5
9.EE.45MakatiteNa2Si4O8(OH)2 · 4H2O
9.EE.50VarennesiteNa8Mn2Si10O25(OH,Cl)2 · 12H2O
9.EE.55RaiteNa4Mn32+Ti0.25Si8O20(OH)2 · 10H2O
9.EE.60IntersiliteNa6Mn2+Ti[Si10O24(OH)](OH)3 · 4H2O
9.EE.65Shafranovskite(Na,K)6(Mn,Fe)3Si9O24 · 6H2O
9.EE.65ZakharoviteNa4Mn5Si10O24(OH)6 · 6H2O
9.EE.70ZeophylliteCa13(Si10O28)F10 · 6H2O
9.EE.75Minehillite(K,Na)2-3Ca28Zn4Al4Si40O112(OH)16
9.EE.80Fedorite(Na,K)2-3(Ca4Na3)Si16O38(OH,F)2 · 3.5H2O
9.EE.80Martinite(Na,◻,Ca)12Ca4(Si,S,B)14B2O38(OH,Cl)2F2·4H2O
9.EE.85Lalondeite(Na,Ca)6(Ca,Na)3Si16O38(F,OH)2·3H2O
14.17.1RhodoniteMnSiO3
14.17.2TephroiteMn22+SiO4
14.17.3BrauniteMn2+Mn63+(SiO4)O8
14.17.4AlleghanyiteMn52+(SiO4)2(OH)2
14.17.5Ribbeite(Mn2+,Mg)5(SiO4)2(OH)2
14.17.6LeucophoeniciteMn72+(SiO4)3(OH)2
14.17.7JerrygibbsiteMn92+(SiO4)4(OH)2
14.17.8BementiteMn7Si6O15(OH)8
14.17.9ParsettensiteK1.2Mn8(Si,Al)12O26(OH)10

Other Names for Yofortierite

Name in Other Languages:
Simplified Chinese:锰坡缕石
Spanish:Yofortierita
Traditional Chinese:錳坡縷石

Other Information

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 Yofortierite

Reference List:
PERRAULT, G., HARVEY, Y., and PERTSOWSKY, R. (1975) La yofortierite, un nouveau silicate hydraté de manganése de St Hilaire, P.Q. Canadian Mineralogist, 13, 68-74. (in French with English abstract). Abstracted in American Mineralogist (1976), 61, 341.

HORVÁTH, L., PFENNINGER-HORVÁTH, E., GAULT, R.A., and TARASSOFF, P. (1998) Mineralogy of the Saint Amable sill, Varennes and Saint Amable, Québec, Canada. Mineralogical Record, 29, 83-118.

Hawthorne, F.C., Abdu, Y.A., Tait, K.T. and Back, M.E. (2013): The crystal structure of yofortierite. Can. Mineral. 51, 243-251.

Internet Links for Yofortierite

Localities for Yofortierite

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.
(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
Canada
 
  • Québec
    • Montérégie
      • La Vallée-du-Richelieu RCM
        • Mont Saint-Hilaire
Perrault G., Harvey Y. and Pertsowsky R. (1975), La yofortierite, un nouveau silicate hydrate de manganese de St. Hilaire, P.Q. Canadian Mineralogist, 13, 68-74; HORVÁTH, L., and GAULT, R.G. (1990) The mineralogy of Mont Saint Hilaire. Mineralogical Record, 21, 284 359; Hawthorne, F.C., Abdu, Y.A., Tait, K.T. and Back, M.E. (2013): The crystal structure of yofortierite. Can. Mineral. 51, 243-251.
      • Lajemmerais RCM
        • Varennes & St-Amable
HORVÁTH, L., PFENNINGER HORVÁTH, E., GAULT, R.A., and TARASSOFF, P. (1998) Mineralogy of the Saint Amable sill, Varennes and Saint Amable, Québec, Canada. Mineralogical Record, 29, 83 118.
Horváth, L., Pfenninger-Horváth, E., Gault, R. A., & Tarassoff, P. (1998): Mineralogy of the Saint-Amable Sill, Varennes and Saint-Amable, Québec. Mineralogical Record, 29: 83-118.
Greenland
 
  • Kujalleq
    • Narsaq
Semenov, E. (2001): Notes on Ephesite, Terskite, Na-Komarovite, Ceriopyrochlore-(Ce), Joaquinite-(Ce) and other minerals from the Ilimaussaq alkaline complex, South Greenland, Geology of Greenland Survey Bulletin 190, 123-125; Petersen, O.V. (2001): List of all minerals identified in the Ilímaussaq alkaline complex, South Greenland. Geology of Greenland Survey Bulletin. 190, 25-33
        • Kuannersuit Plateau (Kvanefjeld)
Pavel M. Kartashov analytical data
Namibia
 
  • Khomas Region
    • Windhoek District
      • Aris
Wartha, R., Palfi, A., Niedermayr, G., Brandstätter, F. and Petersen, O. V. (2001): Der Aris-Phonolith-Komplex und seine Mineralien. In Bahmann, U. and A. (Eds.), Namibia – Zauberwelt edler Steine und Kristalle, Bode-Verlag, Haltern, Germany, pp. 172-179. (in German)
Russia
 
  • Northern Region
    • Murmanskaja Oblast'
      • Kola Peninsula
        • Lovozero Massif
Arzamastsev, A., Yakovenchuk, V., Pakhomovsky, Y., & Ivanyuk, G. (2008). The Khibina and Lovozero alkaline massifs: Geology and unique mineralization. In Guidbook for 33rd International Geological Congress Excursion (No. 47, p. 58).
P.M. Kartashov data; New Data on Minerals M., 2004 Vol 39 pp 5-13; Pekov, I. V., Chukanov, N. V., Yamnova, N. A., Zadov, A. E., & Tarassoff, P. (2007). Gjerdingenite-Na and gjerdingenite-Ca, two new mineral species of the labuntsovite group. The Canadian Mineralogist, 45(3), 529-539
USA
 
  • Arkansas
    • Hot Spring Co.
      • Magnet Cove
Henry Barwood - unpublished (2010)
Mineral and/or Locality  
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