Keystoneite Mineral Data

General Keystoneite Information

Chemical Formula:

Mg0.5[Ni++Fe++(TeO3)3]•4.5(H2O)

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

Empirical Formula:

Mg_0.5NiFe²⁺(TeO₃)₃•4.5(H₂O)

Environment:

Secondary mineral in telluride-bearing ores.

IMA Status:

Approved IMA 1988

Locality:

Keystone mine, Magnolia distict, Boulder County, Colorado, USA. Link to MinDat.org Location Data.

Name Origin:

Named for the locality

Name Pronunciation:

Keystoneite + Pronunciation

Keystoneite Image

Images:

Keystoneite

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

Axial Ratios:

a:c = 1:0.8141

Cell Dimensions:

a = 9.344, c = 7.607, Z = 2; V = 575.19 Den(Calc)= 4.24

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/I_o): 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

Cleavage:

None

Color:

Golden yellow, Orange yellow.

Density:

4.4

Habit:

Acicular - Occurs as needle-like crystals.

Habit:

Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite)

Luster:

Adamantine

Optical Properties of Keystoneite

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

Optical Data:

Uniaxial (+), w=1.99, e=1.85, bire=0.1400.

Calculated Properties of Keystoneite

Electron Density:

Bulk Density (Electron Density)=3.99 gm/cc
note: Specific Gravity of Keystoneite =4.40 gm/cc.

Fermion Index:

Fermion Index = 0.04
Boson Index = 0.96

Photoelectric:

PE_Keystoneite= 182.30 barns/electron
U=PE_Keystoneite x rElectron Density= 727.27 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Keystoneite is Not Radioactive

Keystoneite Classification

Dana Class:

34.03.02.03 (34)Selenites - Tellurites - Sulfites

(34.03)Dana Type

(34.03.02)Zemannite Group

34.03.02.01 Zemannite Mg0.5[ZnFe(TeO3)3]•4.5(H2O) P 6₃/m 6/m

34.03.02.02 Kinichilite Mg0.5[MnFe(TeO3)3]•4.5(H2O) P 6₃/m 6/m

34.03.02.03 Keystoneite Mg0.5[NiFe(TeO3)3]•4.5(H2O) P 6₃/m 6/m

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

References:

NAME( Dana8) PHYS. PROP.(37th List of New Min.,Min. Mag.,1996) OPTIC PROP.(Dana8)

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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Print or Cut-and-Paste your Keystoneite Specimen Label here :

Keystoneite

Mg0.5[Ni++Fe++(TeO3)3]•4.5(H2O)
Dana No: 34.03.02.03 Strunz No: 04.JM.05
Locality:

Notes:

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