Mineralogy Database

Keystoneite Mineral Data

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General Keystoneite Information

Help on Chemical  Formula: Chemical Formula: Mg0.5[Ni++Fe++(TeO3)3]•4.5(H2O)
Help on Composition: Composition: Molecular Weight = 734.55 gm
   Magnesium   1.65 %  Mg    2.74 % MgO
   Iron        7.60 %  Fe    9.78 % FeO
   Nickel      7.99 %  Ni   10.17 % NiO
   Tellurium  52.11 %  Te   65.18 % TeO2
   Hydrogen    1.23 %  H    11.04 % H2O
   Oxygen     29.40 %  O
             ______        ______ 
             100.00 %       98.91 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Mg0.5NiFe2+(TeO3)3•4.5(H2O)
Help on Environment: Environment: Secondary mineral in telluride-bearing ores.
Help on IMA Status: IMA Status: Approved IMA 1988
Help on Locality: Locality: Keystone mine, Magnolia distict, Boulder County, Colorado, USA. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for the locality
Help on Name Pronunciation: Name Pronunciation: Keystoneite + Pronunciation Say KEYSTONEITE

Keystoneite Image

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Comments: Yellow, feathery keystoneite on quartz.
Location: Mcalpine Mine, Moccasin, Tuolumne Co., California, USA. Scale: Picture size 2 mm.
© Thomas Witzke / Abraxas-Verlag

Keystoneite Crystallography

Help on Axial Ratios: Axial Ratios: a:c = 1:0.8141
Help on Cell Dimensions: Cell Dimensions: a = 9.344, c = 7.607, Z = 2; V = 575.19 Den(Calc)= 4.24
Help on Crystal System: Crystal System: Hexagonal - Dipyramidal H-M Symbol (6/m) Space Group: P 63/m
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.77(1), 8.12(0.9), 4.05(0.8),1.72(0.6), 1.498(0.5), 2.84(0.5), 2.95(0.5), 3.81(0.4),

Physical Properties of Keystoneite

Help on Cleavage: Cleavage: None
Help on Color: Color: Golden yellow, Orange yellow.
Help on Density: Density: 4.4
Help on Habit: Habit: Acicular - Occurs as needle-like crystals.
Help on Habit: Habit: Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite)
Help on Luster: Luster: Adamantine

Optical Properties of Keystoneite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.006 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= -0.032 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.217,KPDmeas= 0.2091,KC= 0.2103
Ncalc = 1.89 - 1.93
Help on Optical Data: Optical Data: Uniaxial (+), w=1.99, e=1.85, bire=0.1400.

Calculated Properties of Keystoneite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.99 gm/cc
note: Specific Gravity of Keystoneite =4.40 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.04
Boson Index = 0.96
Help on Photoelectric: Photoelectric: PEKeystoneite = 182.30 barns/electron
U=PEKeystoneite x rElectron Density= 727.27 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Keystoneite is Not Radioactive

Keystoneite Classification

Help on  Dana Class: Dana Class: (34)Selenites - Tellurites - Sulfites
  (34.03)Dana Type
  (34.03.02)Zemannite Group Zemannite Mg0.5[ZnFe(TeO3)3]•4.5(H2O) P 63/m 6/m Kinichilite Mg0.5[MnFe(TeO3)3]•4.5(H2O) P 63/m 6/m Keystoneite Mg0.5[NiFe(TeO3)3]•4.5(H2O) P 63/m 6/m
Help on  Strunz Class: Strunz Class: 04.JM.05 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate
  04.J - Arsenites, Antimonites, Bismuthites, Sulfites,
  04.JM -Tellurites without additional anions, with H2O
04.JM.05 Keystoneite Mg0.5[NiFe(TeO3)3]•4.5(H2O) P 63/m 6/m
04.JM.05 Kinichilite Mg0.5[MnFe(TeO3)3]•4.5(H2O) P 63/m 6/m
04.JM.05 Zemannite Mg0.5[ZnFe(TeO3)3]•4.5(H2O) P 63/m 6/m

Other Keystoneite Information

Help on References: References: NAME( Dana8) PHYS. PROP.(37th List of New Min.,Min. Mag.,1996) OPTIC PROP.(Dana8)
Help on See Also: See Also: Links to other databases for Keystoneite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info

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Dana No: Strunz No: 04.JM.05





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