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Varennesite

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About VarennesiteHide

Formula:
Na8Mn2Si10O25(OH,Cl)2 · 12H2O
Colour:
Pale brownish-yellow to orange
Lustre:
Vitreous
Hardness:
4
Crystal System:
Orthorhombic
Name:
Named after its discovery locality, the Demix-Varennes quarry, Quebec, Canada.
This page provides mineralogical data about Varennesite.


Classification of VarennesiteHide

Approved
Approval Year:
1994
First Published:
1995
8/H.28-100
9.EE.50

9 : SILICATES (Germanates)
E : Phyllosilicates
E : Single tetrahedral nets of 6-membered rings connected by octahedral nets or octahedral bands
72.5.5.1

72 : PHYLLOSILICATES Two-Dimensional Infinite Sheets with Other Than Six-Membered Rings
5 : Two-Dimensional Infinite Sheets with Other Than Six-Membered Rings with corrugated and complex layers

Physical Properties of VarennesiteHide

Vitreous
Transparency:
Transparent, Translucent, Opaque
Colour:
Pale brownish-yellow to orange
Streak:
White
Hardness:

Optical Data of VarennesiteHide

Type:
Biaxial (+)
RI values:
nα = 1.532 nβ = 1.540 nγ = 1.550
2V:
Measured: 89° , Calculated: 86°
Max Birefringence:
δ = 0.018
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Low
Dispersion:
weak

Chemical Properties of VarennesiteHide

Formula:
Na8Mn2Si10O25(OH,Cl)2 · 12H2O

Crystallography of VarennesiteHide

Crystal System:
Orthorhombic

Type Occurrence of VarennesiteHide

Reference:
Grice, J.D., Gault, R.A. (1995) Varennesite, a new species of hydrated Na-Mn silicate with a unique monophyllosilicate structure. Canadian Mineralogist: 33: 1073-1081.

Synonyms of VarennesiteHide

Other Language Names for VarennesiteHide

Common AssociatesHide

Associated Minerals Based on Photo Data:
Natrolite6 photos of Varennesite associated with Natrolite on mindat.org.
Yofortierite3 photos of Varennesite associated with Yofortierite on mindat.org.
Zakharovite3 photos of Varennesite associated with Zakharovite on mindat.org.
Sphalerite2 photos of Varennesite associated with Sphalerite on mindat.org.
Eudialyte Group2 photos of Varennesite associated with Eudialyte Group on mindat.org.
Manganoneptunite2 photos of Varennesite associated with Manganoneptunite on mindat.org.
Magadiite2 photos of Varennesite associated with Magadiite on mindat.org.
Makatite1 photo of Varennesite associated with Makatite on mindat.org.
Eudialyte1 photo of Varennesite associated with Eudialyte on mindat.org.
Microcline1 photo of Varennesite associated with Microcline on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

9.EE.05BementiteMn7Si6O15(OH)8Mon.
9.EE.10BrokenhilliteMn8Si6O15(OH)10Hex. 6mm : P63mc
9.EE.10Pyrosmalite-(Fe)Fe2+8Si6O15(OH,Cl)10Trig. 3m (3 2/m) : P3m1
9.EE.10FriedeliteMn2+8Si6O15(OH,Cl)10Mon. 2/m : B2/m
9.EE.10Pyrosmalite-(Mn)Mn2+8Si6O15(OH,Cl)10Trig.
9.EE.10Mcgillite(Mn,Fe)8Si6O15(OH)8Cl2Mon. 2/m : B2/m
9.EE.15Nelenite(Mn,Fe)16(Si12O30)(OH)14[As3+3O6(OH)3]Mon.
9.EE.15SchalleriteMn2+16As3Si12O36(OH)17Trig. 3m : P3m1
9.EE.20Palygorskite(Mg,Al)5(Si,Al)8O20(OH)2 · 8H2OMon. 2/m : B2/m
9.EE.20TuperssuatsiaiteNa2Fe3Si8O20(OH)2 · 4H2OMon. 2/m : B2/m
9.EE.20YofortieriteMn5Si8O20(OH)2 · 8-9H2OMon. 2/m : B2/m
9.EE.20WindhoekiteCa2Fe3+2.67[Si8O20](OH)4 · 10H2O Mon. 2/m : B2/m
9.EE.25Falcondoite(Ni,Mg)4Si6O15(OH)2 · 6H2OOrth.
9.EE.25LoughliniteNa2Mg3Si6O16 · 8H2OOrth.
9.EE.25SepioliteMg4(Si6O15)(OH)2 · 6H2OOrth. mmm (2/m 2/m 2/m) : Pnna
9.EE.25Kalifersite(K,Na)5Fe3+7Si20O50(OH)6 · 12H2OTric.
9.EE.30GyroliteNaCa16Si23AlO60(OH)8 · 14H2OTric.
9.EE.30OrlymaniteCa4Mn3Si8O20(OH)6 · 2H2OHex.
9.EE.30TungusiteCa4Fe2Si6O15(OH)6
9.EE.35Reyerite(Na,K)2Ca14(Si,Al)24O58(OH)8 · 6H2OTrig.
9.EE.35Truscottite(Ca,Mn)14Si24O58(OH)8 · 2H2OTrig.
9.EE.40NatrosiliteNa2Si2O5Mon.
9.EE.45MakatiteNa2Si4O8(OH)2 · 4H2OMon. 2/m : P21/b
9.EE.55RaiteNa4Mn2+3Ti0.25Si8O20(OH)2 · 10H2OOrth. 2 2 2 : C2 2 2
9.EE.60IntersiliteNa6Mn2+Ti[Si10O24(OH)](OH)3 · 4H2OMon.
9.EE.65Shafranovskite(Na,K)6(Mn,Fe)3Si9O24 · 6H2OTrig.
9.EE.65ZakharoviteNa4Mn5Si10O24(OH)6 · 6H2OTrig.
9.EE.70ZeophylliteCa13Si10O28(OH)2F8 · 6H2OTrig. 3 : R3
9.EE.75Minehillite(K,Na)2-3Ca28Zn4Al4Si40O112(OH)16Hex.
9.EE.80Fedorite(Na,K)2-3(Ca4Na3)Si16O38(OH,F)2 · 3.5H2OTric. 1 : P1
9.EE.80Martinite(Na,◻,Ca)12Ca4(Si,S,B)14B2O38(OH,Cl)2F2·4H2OTric. 1 : P1
9.EE.85Lalondeite(Na,Ca)6(Ca,Na)3Si16O38(F,OH)2·3H2OTric. 1 : P1

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 VarennesiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Grice, J.D., Gault, R.A. (1995) Varennesite, a new species of hydrated Na-Mn silicate with a unique monophyllosilicate structure. Canadian Mineralogist: 33: 1073-1081.
Horváth, L., Pfenninger Horváth, E., Gault, R.A., Tarassoff, P. (1998) Mineralogy of the Saint Amable sill, Varennes and Saint Amable, Québec, Canada. Mineralogical Record: 29: 83-118.

Internet Links for VarennesiteHide

Localities for VarennesiteHide

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
    • Montérégie
      • 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.
GRICE, J.D. & GAULT, R.A. (1995): Varennesite, a new species of hydrated Na-Mn silicate with a unique monophyllosilicate structure. Canadian Mineralogist 33, 1073-1081. 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.
Mineral and/or Locality  
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