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Johninnesite

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Formula:
Na2Mn2+9Mg7(OH)8[AsO4]2[Si6O17]2
Colour:
Brownish-yellow, yellow-brown
Lustre:
Vitreous, Sub-Vitreous, Silky
Hardness:
5 - 6
Specific Gravity:
3.48
Crystal System:
Triclinic
Name:
Named in 1986 by P. J. Dunn, Donald R. Peacor, Shu-Chun Su, Joseph A. Nelen, and Oleg von Knorring in honour of John Innes [Australia - 1992 Western Australia, Australia], mineralogist of the Tsumeb Corporation and the Commonwealth Scientific and Industrial Research Organization (CSIRO) of Western Australia, for his contributions to the geology and mineralogy of the Tsumeb and Kombat mines. John Innes authored many scientific papers, including several naming new minerals.
Golden-brown to yellow-brown vitreous to silky fibers in bundles to 2.5 cm


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Classification of JohninnesiteHide

Approved
9.DH.70

9 : SILICATES (Germanates)
D : Inosilicates
H : Inosilicates with 4-periodic single chains, Si4O12
69.2.5.1

69 : INOSILICATES Chains with Side Branches or Loops
2 : Chains with Side Branches or Loops with P>2
17.7.6

17 : Silicates Containing other Anions
7 : Silicates with vanadate, arsenate or antimonate

Physical Properties of JohninnesiteHide

Vitreous, Sub-Vitreous, Silky
Transparency:
Transparent, Translucent
Colour:
Brownish-yellow, yellow-brown
Streak:
Light brownish-yellow
Hardness:
5 - 6 on Mohs scale
Tenacity:
Very brittle
Cleavage:
Distinct/Good
{100} good, {010| poor
Fracture:
Splintery
Density:
3.48 g/cm3 (Measured)    3.51 g/cm3 (Calculated)

Optical Data of JohninnesiteHide

Type:
Biaxial (-)
RI values:
nα = 1.674 nβ = 1.697 nγ = 1.700
2V:
Measured: 41° , Calculated: 40°
Birefringence:
0.0257
Max Birefringence:
δ = 0.026
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
High
Dispersion:
r > v distinct
Pleochroism:
Non-pleochroic

Chemical Properties of JohninnesiteHide

Formula:
Na2Mn2+9Mg7(OH)8[AsO4]2[Si6O17]2
IMA Formula:
Na2Mn2+9Mg7(AsO4)2(Si6O17)2(OH)8
Common Impurities:
Fe,H2O

Crystallography of JohninnesiteHide

Crystal System:
Triclinic
Cell Parameters:
a = 10.48 Å, b = 11.06 Å, c = 9.65 Å
α = 107.11°, β = 81.17°, γ = 111.86°
Ratio:
a:b:c = 0.948 : 1 : 0.873
Unit Cell V:
990.93 ų (Calculated from Unit Cell)
Z:
1
Morphology:
Fibers often in subparallel to slightly divergent groups.
Twinning:
Observed, but not defined

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
9.8 (60)
9.2 (1)
7.8 (2)
7.3 (5)
5.99 (40)
5.26 (10)
4.91 (10b)
4.63 (1)
4.39 (10)
4.24 (2)
4.06 (30)
3.89 (30)
3.67 (30)
3.48 (30)
3.38 (40)
3.23 (60)
3.05 (10)
2.965 (20)
2.892 (20)
2.842 (20)
2.676 (100)
2.630 (2)
2.571 (10)
2.479 (40)
2.436 (30)
2.354 (20)
2.288 (10)
2.190 (10)
2.147 (5)
2.044 (20)
1.994 (1)
1.866 (30)
1.796 (20)
1.772 (1)
1.726 (10)
1.701 (10)
1.623 (2)
1.606 (30)
1.539 (40)
1.498 (2)
1.441 (10)
1.427 (5)
1.402 (2)
1.386 (2)
1.365 (5)
1.359 (2)
1.348 (2)
1.301 (2)
1.279 (5)
1.262 (2)
1.214 (5)
Comments:
Dunn et al. (1986)

Occurrences of JohninnesiteHide

Type Occurrence of JohninnesiteHide

Synonyms of JohninnesiteHide

Other Language Names for JohninnesiteHide

Relationship of Johninnesite to other SpeciesHide

Other Members of this group:
Deerite(Fe,Mn)6(Fe,Al)3[Si6O17]O3(OH)5Mon.
HowieiteNa(Fe,Mn)10(Fe,Al)2Si12O31(OH)13Tric.
Taneyamalite(Na,Ca)(Mn,Mg,Fe)12Si12(O,OH)44Tric.

Common AssociatesHide

Associated Minerals Based on Photo Data:
Nambulite2 photos of Johninnesite associated with Nambulite on mindat.org.
Jacobsite1 photo of Johninnesite associated with Jacobsite on mindat.org.
Magnesio-riebeckite1 photo of Johninnesite associated with Magnesio-riebeckite on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

9.DH.05LeucophaniteNaCaBeSi2O6FOrth. 2 2 2 : P21 21 21
9.DH.10OhmiliteSr3(Ti,Fe3+)(Si4O12)(O,OH) · 2-3H2OMon.
9.DH.15HaradaiteSrVSi2O7Orth.
9.DH.15SuzukiiteBaVSi2O7Orth.
9.DH.20BatisiteBaNaNaTi2(Si4O12)O2Orth.
9.DH.20Shcherbakovite(K,Ba)KNa(Ti,Nb)2(Si4O12)O2Orth.
9.DH.25TaikaniteSr3BaMn2+2(Si4O12)O2Mon.
9.DH.30KrauskopfiteBaSi2O5 · 3H2OMon.
9.DH.35Balangeroite(Mg,Fe2+,Fe3+,Mn2+)42Si16O54(OH)40Mon.
9.DH.35GageiteMn21(Si4O12)2O3(OH)20Mon. 2/m
9.DH.40AenigmatiteNa2Fe2+5Ti(Si6O18)O2Tric. 1 : P1
9.DH.40DorriteCa4(Mg3Fe3+9)O4(Si3Al8Fe3+O36)Tric.
9.DH.40HøgtuvaiteCa4[Fe2+6Fe3+6]O4[Si8Be2Al2O36]Tric. 1 : P1
9.DH.40KrinoviteNa2Mg4Cr3+2(Si6O18)O2Tric.
9.DH.40Makarochkinite(Ca,Na)2Fe2+4Fe3+Ti[O2|BeAlSi4O18]Tric. 1 : P1
9.DH.40RhöniteCa2(Mg,Fe2+,Fe3+,Ti)6[O2|(Si,Al)6O18]Tric. 1 : P1
9.DH.40SerendibiteCa4[Mg6Al6]O4[Si6B3Al3O36]Tric. 1 : P1
9.DH.40WelshiteCa4Mg9Sb3O4[Si6Be3AlFe2O36]Tric. 1 : P1
9.DH.40WilkinsoniteNa2Fe2+4Fe3+2(Si6O18)O2Tric. 1 : P1
9.DH.45SapphirineMg4(Mg3Al9)O4[Si3Al9O36]Mon. 2/m : P21/b
9.DH.50Khmaralite(Mg,Al,Fe)16[(Al,Si,Be)12O36]O4Mon. 2/m : P21/b
9.DH.55Surinamite(Mg,Fe)3Al4BeSi3O16Mon.
9.DH.60Deerite(Fe,Mn)6(Fe,Al)3[Si6O17]O3(OH)5Mon.
9.DH.65HowieiteNa(Fe,Mn)10(Fe,Al)2Si12O31(OH)13Tric.
9.DH.65Taneyamalite(Na,Ca)(Mn,Mg,Fe)12Si12(O,OH)44Tric.
9.DH.75AgrelliteNaCa2Si4O10FTric.

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

17.7.1SuzukiiteBaVSi2O7Orth.
17.7.2FranciscaniteMn2+6(V5+,☐)2(SiO4)2(O,OH)6Hex.
17.7.3Kurumsakite(Zn,Ni,Cu)8Al8V5+2Si5O35 · 27H2O (?)
17.7.4Ardennite-(As)Mn2+4Al4(AlMg)(AsO4)(SiO4)2(Si3O10)(OH)6Orth. mmm (2/m 2/m 2/m)
17.7.5MedaiteMn2+6V5+Si5O18(OH)Mon.
17.7.7TiragalloiteMn2+4As5+Si3O12(OH)Mon. 2/m
17.7.8DixeniteCuMn2+14Fe2+(SiO4)2(As5+O4)(As3+O3)5(OH)6Trig.
17.7.9AsbecasiteCa3(Ti,Sn4+)Be2(AsO3)6(SiO4)2Trig. 3m : P3c1
17.7.10McgoverniteMn19Zn3(AsO4)3(AsO3)(SiO4)3(OH)21Trig. 3m (3 2/m)
17.7.11KraissliteZn3(Mn,Mg)25(Fe3+,Al)(As3+O3)2[(Si,As5+)O4]10(OH)16Orth. 2 2 2 : C2 2 21
17.7.12SchalleriteMn2+16As3Si12O36(OH)17Trig. 3m : P3m1
17.7.13Nelenite(Mn,Fe)16(Si12O30)(OH)14[As3+3O6(OH)3]Mon.
17.7.14KoliciteMn2+7Zn4(AsO4)2(SiO4)2(OH)8Orth. mmm (2/m 2/m 2/m) : Cmca
17.7.15YeatmaniteZn6Mn2+9Sb5+2(SiO4)4O12Tric.
17.7.16WelshiteCa4Mg9Sb3O4[Si6Be3AlFe2O36]Tric. 1 : P1
17.7.17Katoptrite(Mn2+,Mg)13(Al,Fe3+)4Sb5+2(SiO4)2O20Mon. 2/m : B2/m
17.7.18ParweliteMn10Sb2As2Si2O24Mon. m : Bb
17.7.19LångbaniteMn2+4Mn3+9Sb5+O16(SiO4)2Trig. 3m : P3m1
17.7.20ChapmaniteFe3+2Sb3+(Si2O5)O3(OH)Mon. m : Bm
17.7.21Cervandonite-(Ce)(Ce,Nd,La)(Fe3+,Fe2+,Ti,Al)3O2(Si2O7)(As3+O3)(OH)Trig. 3m : R3m

Fluorescence of JohninnesiteHide

Not fluorescent

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 JohninnesiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Dunn, P. J., Peacor, Donald R., Su, Shu-Chun, Nelen, Joseph A., and von Knorring, Oleg (1986) Johninnesite, a new Sodium Manganese Arsenosilicate from the Kombat Mine, Namibia, Mineralogical Magazine, v. 50, p. 667-670.
American Mineralogist (1988): 73: 428.
American Mineralogist (1994): 79: 991-995.
Schweizerische mineralogische und petrographische Mitteilungen (1997): 77: 449-455.

Internet Links for JohninnesiteHide

Localities for JohninnesiteHide

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.
Namibia (TL)
 
  • Otjozondjupa Region
    • Grootfontein District
      • Kombat
Mineralogical Magazine (1986): 50, 667-670. Dunn, P.J. (1991), Rare minerals of the Kombat Mine, Mineralogical Record: 22(6): 421-425.
Switzerland
 
  • Grischun (Grisons; Graubünden)
    • Hinterrhein Valley
      • Ferrera Valley
        • Ausserferrera
Stalder, H. A., Wagner, A., Graeser, S. and Stuker, P. (1998): "Mineralienlexikon der Schweiz", Wepf (Basel), p. 230.; Brugger, J. (1996): The Fe, Mn, (V, Sb, As, Be, W) deposits of Val Ferrera (Graubünden, Switzerland). Unpublished PhD Thesis, Univ. Basel., 188 p.; Brugger, J., Berlepsch, P. (1997) Johninnesite Na2(Mn)9(Mn,Mg)7(AsO4)2(Si6O17)2(OH)8: a new occurrence in Val Ferrera (Graubünden, Switzerland): Schweiz. Mineral. Petrogr. Mitt., 77, 449-455.
Mineral and/or Locality  
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