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Keystoneite

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About KeystoneiteHide

Formula:
Mg0.5Ni2+Fe3+(Te4+O3)3 · 4.5H2O
Colour:
Golden yellow
Lustre:
Adamantine
Specific Gravity:
4.4 (Calculated)
Crystal System:
Hexagonal
Member of:
Name:
For the type locality.
Ni-analogue of kinichilite and zemannite. Ni-Fe-analogue of ilirneyite.


Classification of KeystoneiteHide

Approved
4.JM.05

4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
J : Arsenites, antimonites, bismuthites, sulfites, selenites, tellurites; iodates
M : Tellurites without additional anions, with H2O
34.3.2.3

34 : SELENITES, TELLURITES AND SULFITES
3 : A2(XO3)3·xH2O
28.3.28

28 : Selenites, Selenates, Tellurites, and Tellurates
3 : Tellurites

Physical Properties of KeystoneiteHide

Adamantine
Transparency:
Translucent
Colour:
Golden yellow
Streak:
Pale yellow-green
Density:
4.4 g/cm3 (Calculated)

Optical Data of KeystoneiteHide

Type:
Uniaxial (+)
RI values:
nω = 1.850() nε = 1.990(1)
Max Birefringence:
δ = 0.140
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Very High

Chemical Properties of KeystoneiteHide

Formula:
Mg0.5Ni2+Fe3+(Te4+O3)3 · 4.5H2O
IMA Formula:
Mg0.5NiFe3+(Te4+O3)3 · 4.5H2O

Crystallography of KeystoneiteHide

Crystal System:
Hexagonal
Cell Parameters:
a = 9.344(2) Å, c = 7.607(3) Å
Ratio:
a:c = 1 : 0.814
Unit Cell V:
575.19 ų (Calculated from Unit Cell)
Z:
2
Morphology:
Acicular hexagonal crystals, parallel aggregates and radiating sprays.
Comment:
Point group 6/m or 6

Type Occurrence of KeystoneiteHide

Place of Conservation of Type Material:
Canadian Museum of Nature, Ottawa, Canada 56561
Geological Setting of Type Material:
Oxidation zone of a complex polymetallic hydrothermal deposit.

Synonyms of KeystoneiteHide

Other Language Names for KeystoneiteHide

German:Keystoneit
Spanish:Keystoneita

Relationship of Keystoneite to other SpeciesHide

Member of:
Other Members of this group:
IlirneyiteMg0.5ZnMn3+(Te4+O3)3 · 4.5H2OHex. 6/m : P63/m
KinichiliteMg0.5Mn2+Fe3+(Te4+O3)3 · 4.5H2OHex. 6/m : P63/m
ZemanniteMg0.5ZnFe3+(Te4+O3)3 · 4.5H2OHex. 6/m : P63/m

Common AssociatesHide

Associated Minerals Based on Photo Data:
Choloalite5 photos of Keystoneite associated with Choloalite on mindat.org.
Quartz5 photos of Keystoneite associated with Quartz on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

4.JM.05KinichiliteMg0.5Mn2+Fe3+(Te4+O3)3 · 4.5H2OHex. 6/m : P63/m
4.JM.05ZemanniteMg0.5ZnFe3+(Te4+O3)3 · 4.5H2OHex. 6/m : P63/m
4.JM.10BlakeiteFe3+2[TeO3]3 (?)
4.JM.10EmmonsiteFe3+2(TeO3)3 · 2H2OTric. 1 : P1
4.JM.15GraemiteCu[TeO3] · H2OOrth. mmm (2/m 2/m 2/m) : Pmma
4.JM.20TeineiteCu2+(Te4+O3) · 2H2OOrth. mmm (2/m 2/m 2/m)

Related Minerals - Dana Grouping (8th Ed.)Hide

34.3.2.1ZemanniteMg0.5ZnFe3+(Te4+O3)3 · 4.5H2OHex. 6/m : P63/m
34.3.2.2KinichiliteMg0.5Mn2+Fe3+(Te4+O3)3 · 4.5H2OHex. 6/m : P63/m

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

28.3.1BalyakiniteCu(TeO3)Orth.
28.3.2RajiteCu(Te4+2O5)Mon. 2/m : P21/b
28.3.3GraemiteCu[TeO3] · H2OOrth. mmm (2/m 2/m 2/m) : Pmma
28.3.4TeineiteCu2+(Te4+O3) · 2H2OOrth. mmm (2/m 2/m 2/m)
28.3.5CesbroniteCu2+3Te6+O4(OH)4Orth.
28.3.6MroseiteCaTe4+(CO3)O2Orth. mmm (2/m 2/m 2/m) : Pbca
28.3.7QuetzalcoatliteZn6Cu3(TeO6)2(OH)6 · AgxPbyClx+2yTrig. 3m (3 2/m) : P3m1
28.3.8ZemanniteMg0.5ZnFe3+(Te4+O3)3 · 4.5H2OHex. 6/m : P63/m
28.3.9KinichiliteMg0.5Mn2+Fe3+(Te4+O3)3 · 4.5H2OHex. 6/m : P63/m
28.3.10Denningite(Mn2+,Ca,Zn)Te4+2O5Tet.
28.3.11SpiroffiteMn2+2Te4+3O8Mon. 2/m : B2/b
28.3.12WinstanleyiteTiTe4+3O8Iso. m3 (2/m 3) : Ia3
28.3.13FairbankitePb(TeO3)Tric.
28.3.14PlumbotelluritePb(TeO3)Orth.
28.3.15Choloalite(Cu,Sb)3(Pb,Ca)3(TeO3)6Cl
28.3.16SmirniteBi2Te4+O5Orth. mm2
28.3.17ChekhovichiteBi2Te4+4O11Mon. 2/m
28.3.18Cliffordite(UO2)Te4+3O7Iso. m3 (2/m 3) : Pa3
28.3.19Schmitterite(UO2)(TeO3)Orth.
28.3.20MoctezumitePb(UO2)(TeO3)2Mon.
28.3.21EmmonsiteFe3+2(TeO3)3 · 2H2OTric. 1 : P1
28.3.22BlakeiteFe3+2[TeO3]3 (?)
28.3.23MackayiteFe3+(Te4+2O5)(OH)Tet. 4/mmm (4/m 2/m 2/m) : I41/acd
28.3.24PoughiteFe3+2(TeO3)2(SO4)(H2O)2 · H2OOrth.
28.3.25SonoraiteFe3+(TeO3)(OH) · H2OMon.
28.3.26RodalquilariteFe2(TeO2OH)3(TeO3)ClTric. 1 : P1
28.3.27EztlitePb2+2Fe3+3(Te4+ O3)3(SO4)O2ClMon.

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 KeystoneiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Back, M.E., Roberts, A.C., LePage, Y., Mandarino, J.A. (1988): Keystoneite, a new tellurite from the Keystone mine, Colorado, U.S.A. Joint Meeting Geological Association of Canada – Mineralogical Association of Canada, Program and Abstracts, 13, A4.
Miletich, R. (1995): Crystal chemistry of the microporous tellurite minerals zemannite and kinichilite, Mg0.5[Me2+Fe3+(TeO3)3]•4.5H2O, (Me2+ = Zn, Mn). European Journal of Mineralogy, 7, 509-523.

Internet Links for KeystoneiteHide

Localities for KeystoneiteHide

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.
Armenia
 
  • Gelark'unik' Province (Geghark'unik')
    • Vardenis
Pavel M. Kartashov analytical data (2003)
USA
 
  • California
    • Tuolumne Co.
      • Mother Lode Belt
        • Coulterville District
          • Peñon Blanco Peak
Mineralogical Record (1996) 27:115-120; Roberts, A. C., Ercit, T. S., & Cureton, F. F. (1994). Mcalpineite, Cu3TeO6. H20, from the McAlpine mine, Tuolumne County, California, and from the Centennial Eureka mine, Juab County, Utah I. Mineralogical Magazine, 58, 417-424.
  • Colorado
    • Boulder Co.
      • Magnolia District
"Minerals of Colorado, updated & revised", p. 289, by Eckel, Edwin B., 1997
Minerals of Colorado (1997) Eckel, E. B.
Mineral and/or Locality  
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