Keystoneite Mineral Data

Keystoneite Mineral Data +

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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

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 - DipyramidalH-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

Optical Data:

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

Calculated Properties of Keystoneite

Electron Density:

r_electron=3.99 gm/cc
note: r_Keystoneite=4.40 gm/cc.

Fermion Index

Fermion Index = 0.04595
Boson Index = 0.95405

Photoelectric:

PE_Keystoneite= 182.30 barns/electron
U=PE_Keystoneite x r_electron= 727.27 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Keystoneite is Not Radioactive

Keystoneite Classification

Dana Class:

34.3.2.3 (34)Selenites - Tellurites - Sulfites

(34.3)Dana Type

(34.3.2)Dana Group

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

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

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

Strunz Class:

IV/K.10-10 IV - Oxides

IV/K - Sulfides, selenides, tellurides with [XO3]2- groups and related structures

IV/K.10 - Keystoneite - Francisite series

IV/K.10-10 Keystoneite Mg0.5[NiFe(TeO3)3]·4.5(H2O) P 6₃/m 6/m

IV/K.10-20 Kinichilite Mg0.5[MnFe(TeO3)3]·4.5(H2O) P 6₃/m 6/m

IV/K.10-30 Zemannite Mg0.5[ZnFe(TeO3)3]·4.5(H2O) P 6₃/m 6/m

IV/K.10-40 Quetzalcoatlite Zn8Cu4(TeO3)3(OH)18 C6322 6 2 2

IV/K.10-50 Francisite Cu3Bi(SeO3)2O2Cl Pmmn 2/m 2/m 2/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 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 -École des Mines de Paris

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Translate Keystoneite Mineral Data :

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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: 34.3.2.3 Strunz No: IV/K.10-10
Locality:

Notes: