Coronadite Mineral Data

Coronadite Mineral Data

General Coronadite Information

Chemical Formula:

Pb(Mn++++,Mn++)8O16

Composition:

Molecular Weight = 933.55 gm

Barium 1.47 % Ba 1.64 % BaO

Manganese 45.31 % Mn 3.80 % MnO / 67.05 % MnO₂

Aluminum 0.29 % Al 0.55 % Al₂O₃

Vanadium 1.09 % V 1.95 % V₂O₅

Lead 24.41 % Pb 26.30 % PbO

Oxygen 27.42 % O

______ ______

100.00 % 101.29 % = TOTAL OXIDE

Empirical Formula:

Pb_1.1Ba_0.1Mn⁴⁺_7.2Mn²⁺_0.5V⁵⁺_0.2Al_0.1O₁₆

Environment:

Primary mineral in hydrothermal veins or from hot springs, secondary origin in oxidized zones above Mn deposits and bedded sedimentary rocks.

IMA Status:

Valid Species (Pre-IMA) 1904

Locality:

Coronado vein, Clifton-Morenci district, Greenlee County, Arizona. Link to MinDat.org Location Data.

Name Origin:

Named for Francisco Vasquez de Coronado (ca 1500-1554), first Spanish explorer of the American southwest.

Coronadite Image

Images:

Coronadite Crocoite

Comments: Black coronadite with red crocoite on matrix.
Location: Callenberg North (no. 1) open cut, Callenberg, Glauchau, Saxony, Germany. Scale: Specimen size 7 cm.
© Thomas Witzke / Abraxas-Verlag

Images:

Coronadite Iodargyrite

Comments: Dark, fine-grained massive coronadite with yellowish octahedral iodargyrite crystals.
Location: Broken Hill, New South Wales, Australia. Scale: Picture size 3x2 cm.
© Dave Barthelmy

Coronadite Crystallography

Axial Ratios:

a:b:c =3.4653:1:3.4291

Cell Dimensions:

a = 9.938, b = 2.8678, c = 9.834, Z = 1; beta = 90.39° V = 280.26 Den(Calc)= 5.53

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: I2/m

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

By Intensity(I/I_o): 3.104(1), 3.466(0.6), 1.542(0.5),

Crystal Structure:

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Post J E , Bish D L , American Mineralogist , 74 (1989) p.913-917, Rietveld refinement of the coronadite structure, sample from Morocco

View Additional jPOWD Structure files for Coronadite
[1]

Physical Properties of Coronadite

Color:

Grayish black, Dark gray, Black.

Density:

5.44

Diaphaniety:

Opaque

Habit:

Botryoidal - "Grape-like" rounded forms (e.g.. malachite).

Habit:

Fibrous - Crystals made up of fibers.

Hardness:

4.5-5 - Near Apatite

Luster:

Sub Metallic

Streak:

brownish black

Optical Properties of Coronadite

Optical Data:

Biaxial (?)

NCalc= 2.71 - from Gladstone-Dale relationship (KC = 0.309) where Ncalc=Dcalc*KC+1
NCalc= 2.68 - from Gladstone-Dale relationship (KC = 0.309) where Ncalc=Dmeas*KC+1

Pleochroism (x):

strong dark brown.

Pleochroism (y):

strong dark brown.

Pleochroism (z):

gray.

Calculated Properties of Coronadite

Electron Density:

r_electron=5.00 gm/cc
note: r_Coronadite=5.53 gm/cc.

Fermion Index

Fermion Index = 0.05673
Boson Index = 0.94327

Photoelectric:

PE_Coronadite= 433.51 barns/electron
U=PE_Coronadite x r_electron=2,168.35 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Coronadite is Not Radioactive

Coronadite Classification

Dana Class:

7.9.1.4 (7)Multiple Oxides

(7.9)where A B (O)2

(7.9.1)Cryptomelane Group (Hard black, fine-grained)

7.9.1.1 Hollandite Ba(Mn,Mn)8O16 I2/m 2/m

7.9.1.2 Cryptomelane K(Mn,Mn)8O16 I2/m 2/m

7.9.1.3 Manjiroite (Na,K)(Mn,Mn)8O16·n(H2O) I 4/m 4/m

7.9.1.4 Coronadite Pb(Mn,Mn)8O16 I2/m 2/m

7.9.1.5 Strontiomelane! SrMn6Mn2O16 P 2₁/m 2/m

7.9.1.6 Henrymeyerite! BaFeTi7O16 I 4/m 4/m

Strunz Class:

IV/D.08-70 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 Coronadite Information

References:

NAME( AntBidBlaNic3) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic3)

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Coronadite

Pb(Mn++++,Mn++)8O16
Dana No: 7.9.1.4 Strunz No: IV/D.08-70
Locality:

Notes: