Redledgeite Mineral Data

Redledgeite Mineral Data +

General Redledgeite Information

Chemical Formula:

BaTi6Cr+++2O16·(H2O)

Composition:

Molecular Weight = 802.60 gm

Barium 17.11 % Ba 19.10 % BaO

Titanium 35.79 % Ti 59.71 % TiO₂

Chromium 12.96 % Cr 18.94 % Cr₂O₃

Hydrogen 0.25 % H 2.24 % H₂O

Oxygen 33.89 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

BaTi₆Cr₂O₁₆·(H₂O)

IMA Status:

Approved IMA 1961

Locality:

Red Ledge mine, south of Washington, Nevada Co., California. Link to MinDat.org Location Data.

Name Origin:

Named after it's locality.

Synonym:

ICSD 62114

PDF 39-352

Redledgeite Image

Images:

Redledgeite

Comments: Red Ledge Mine, Washington, Washington District, Nevada Co., California, USA.
Location: Green, massive redledgeite. Scale: Picture size 4.5 mm.
© Thomas Witzke / Abraxas-Verlag

Redledgeite Crystallography

Axial Ratios:

a:c = 1:0.41152

Cell Dimensions:

a = 14.32, c = 5.893, Z = 4; V = 1,208.43 Den(Calc)= 4.41

Crystal System:

Tetragonal - DipyramidalH-M Symbol (4/m) Space Group: I 4₁/a

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 3.19(1), 2.22(0.9), 2.46(0.9),

Crystal Structure:

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Foley J A , Hughes J M , Drexler J W , The Canadian Mineralogist , 35 (1997) p.1531-1534, Redledgeite, Bax([Cr,Fe,V]2xTi8-2x)O16, the I4/m structure and elucidation, of the sequence of tunnel Ba cations

Physical Properties of Redledgeite

Cleavage:

[???] Good

Color:

Yellow green, Black.

Density:

3.72

Diaphaniety:

Opaque

Hardness:

6-7 - Orthoclase-Quartz

Luster:

Adamantine

Streak:

gray white

Optical Properties of Redledgeite

Optical Data:

NCalc= 2.42 - from Gladstone-Dale relationship (KC = 0.3217) where Ncalc=Dcalc*KC+1
NCalc= 2.2 - from Gladstone-Dale relationship (KC = 0.3217) where Ncalc=Dmeas*KC+1

Calculated Properties of Redledgeite

Electron Density:

r_electron=4.11 gm/cc
note: r_Redledgeite=4.41 gm/cc.

Fermion Index

Fermion Index = 0.08924
Boson Index = 0.91076

Photoelectric:

PE_Redledgeite= 82.73 barns/electron
U=PE_Redledgeite x r_electron= 340.00 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Redledgeite is Not Radioactive

Redledgeite Classification

Dana Class:

7.9.5.2 (7)Multiple Oxides

(7.9)where A B (O)2

(7.9.5)Dana Group

7.9.5.1 Mannardite BaTi6V2O16·(H2O) I 4₁/a 4/m

7.9.5.2 Redledgeite BaTi6Cr2O16·(H2O) I 4₁/a 4/m

Strunz Class:

IV/D.08-50 IV - Oxides

IV/D - Oxides with metal : oxygen = 1:2 (MO2 and related compounds)

IV/D.08 - Cryptomelane group

IV/D.08-10 Manjiroite (Na,K)(Mn,Mn)8O16·n(H2O) I 4/m 4/m

IV/D.08-20 Cryptomelane K(Mn,Mn)8O16 I2/m 2/m

IV/D.08-25 Strontiomelane! SrMn6Mn2O16 P 2₁/m 2/m

IV/D.08-30 Priderite (K,Ba)(Ti,Fe)8O16 I 4/m 4/m

IV/D.08-33 Henrymeyerite! BaFeTi7O16 I 4/m 4/m

IV/D.08-35 Ankangite Ba(Ti,V,Cr)8O16 I 4/m 4/m

IV/D.08-40 Mannardite BaTi6V2O16·(H2O) I 4₁/a 4/m

IV/D.08-50 Redledgeite BaTi6Cr2O16·(H2O) I 4₁/a 4/m

IV/D.08-60 Hollandite Ba(Mn,Mn)8O16 I2/m 2/m

IV/D.08-70 Coronadite Pb(Mn,Mn)8O16 I2/m 2/m

IV/D.08-80 Cesarolite PbH2Mn3O8 HEX-R Trig

Other Redledgeite Information

References:

NAME( MinRec) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Redledgeite :
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 - WWW-MINCRYST 13 -École des Mines de Paris

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

Redledgeite

BaTi6Cr+++2O16·(H2O)
Dana No: 7.9.5.2 Strunz No: IV/D.08-50
Locality:

Notes: