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Coronadite

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Francisco Vázquez de Coronado
Formula:
Pb(Mn64+Mn23+)O16
System:
Monoclinic
Colour:
Dark gray, black
Hardness:
4½ - 5
Name:
Named in 1905 by Waldemar Lindgren in recognition of Francisco Vasquez de Coronado [1510 Salamanca, Spain - September 22, 1554, Mexico City, Mexico], a famous Spanish explorer of the American southwest.
Chemically related to (the Pb-richer) cesàrolite. Many manganese oxides are better identified using infra-red spectroscopy than by x-ray diffraction because of issues of crystal size, disorder, etc. (Potter and Rossman, 1979).

A possible precursor mineral is known: 'Unnamed (Amorphous Pb-Mn Hydroxide)'.

Classification of Coronadite

Approved, 'Grandfathered' (first described prior to 1959)
4.DK.05a

4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
D : Metal: Oxygen = 1:2 and similar
K : With large (+- medium-sized) cations; tunnel structures
7.9.1.4

7 : MULTIPLE OXIDES
9 : AB8X16
7.11.28

7 : Oxides and Hydroxides
11 : Oxides of Sn and Pb
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Type Occurrence of Coronadite

General Appearance of Type Material:
Black, metallic, delicately fibrous
Place of Conservation of Type Material:
Smithsonian R2012, 86040
Geological Setting of Type Material:
West end of the Coronado vein, coatings and cement on and in quartz
Associated Minerals at Type Locality:

Occurrences of Coronadite

Geological Setting:
In hydrothermal veins or hot springs, as a weathering product in manganese deposits, bedded sedimentary deposits.

Physical Properties of Coronadite

Metallic, Sub-Metallic, Dull, Earthy
Diaphaneity (Transparency):
Opaque
Colour:
Dark gray, black
Streak:
Brown-black
Hardness (Mohs):
4½ - 5
Density:
5.246 - 5.505 g/cm3 (Measured)    5.45 g/cm3 (Calculated)

Crystallography of Coronadite

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Cell Parameters:
a = 9.938(1) Å, b = 2.8678(5) Å, c = 9.834(2) Å
β = 90.39(2)°
Ratio:
a:b:c = 3.465 : 1 : 3.429
Unit Cell Volume:
V 280.26 ų (Calculated from Unit Cell)
Z:
1
Morphology:
Massive. Botryoidal crusts with a fibrous structure.
X-Ray Powder Diffraction Data:
d-spacingIntensity
3.466 (60)
3.104 (100)
2.400 (40)
2.205 (40)
2.155 (20)
2.001 (10)
1.960 (10)
1.919 (10)
1.836 (20)
1.742 (10)
1.691 (10)
1.642 (20)
1.591 (10)
1.542 (50)
1.432 (10)
1.400 (10)
1.374 (20)
1.356 (20)
1.298 (10)
1.237 (10)
1.218 (10)
1.148 (10)
1.116 (10)
Comments:
ICDD 7-361. Very similar to cryptomelane.

Optical Data of Coronadite

Type:
Biaxial
Type:
Anisotropic
Anisotropism:
Strong
Dispersion:
r > v strong
Colour in reflected light:
Nearly galena-white
Pleochroism:
Strong
Comments:
Dark brown to gray

Chemical Properties of Coronadite

Formula:
Pb(Mn64+Mn23+)O16
All elements listed in formula:
Common Impurities:
Fe,Al,H2O

Relationship of Coronadite to other Species

Other Members of Group:
CryptomelaneK(Mn74+Mn3+)O16
FerrihollanditeBa(Mn64+Fe23+)O16
HollanditeBa(Mn64+Mn23+)O16
ManjiroiteNa(Mn74+Mn3+)O16
StrontiomelaneSr(Mn64+Mn23+)O16
Common Associates:
4.DK.05Akaganeite(Fe3+,Ni2+)8(OH,O)16Cl1.25 · nH2O
4.DK.05aCryptomelaneK(Mn74+Mn3+)O16
4.DK.05aHollanditeBa(Mn64+Mn23+)O16
4.DK.05aManjiroiteNa(Mn74+Mn3+)O16
4.DK.05bMannarditeBa(Ti64+V23+)O16
4.DK.05bPrideriteK(Ti74+Fe3+)O16
4.DK.05bRedledgeiteBa(Ti64+Cr23+)O16
4.DK.05bHenrymeyeriteBa(Ti74+Fe2+)O16
4.DK.05aStrontiomelaneSr(Mn64+Mn23+)O16
4.DK.10Romanèchite(Ba,H2O)2(Mn4+,Mn3+)5O10
4.DK.10Todorokite(Na,Ca,K,Ba,Sr)1-x(Mn,Mg,Al)6O12 · 3-4H2O
7.11.1RomarchiteSnO
7.11.2CassiteriteSnO2
7.11.4SchoenfliesiteMg[Sn(OH)6]
7.11.5BurtiteCa[Sn(OH)6]
7.11.6VismirnoviteZn[Sn(OH)6]
7.11.7WickmaniteMn2+[Sn(OH)6]
7.11.8TetrawickmaniteMn2+[Sn4+(OH)6]
7.11.9JeanbandyiteFe3+xFe2+1-xSn(OH)6-xOx (1 ≥ x > 0.5)
7.11.10NataniteFe2+[Sn(OH)6]
7.11.11Mushistonite(Cu,Zn,Fe2+)[Sn(OH)6]
7.11.12Ferronigerite-2N1S(Al,Fe,Zn)2(Al,Sn)6O11(OH)
7.11.13Magnesionigerite
7.11.14ArgutiteGeO2
7.11.15BrunogeieriteFe22+Ge4+O4
7.11.16StottiteFe2+[Ge4+(OH)6]
7.11.17CarboiriteFeAl2(GeO4)O(OH)2
7.11.18OtjisumeitePbGe4O9
7.11.19BartelkeitePb(Fe2+Ge)[Ge2O7](OH)2 · H2O
7.11.20MassicotPbO
7.11.21LithargePbO
7.11.22MiniumPb3O4
7.11.23PlattneritePbO2
7.11.24Scrutinyiteα-PbO2
7.11.25MurdochitePbCu6O8-x(Cl,Br)2x where x<=0.5
7.11.26MacedonitePbTiO3
7.11.27CesàrolitePb(Mn4+)3O6(OH)2
7.11.29QuenselitePbMnO2(OH)
7.11.30PlumboferritePb2(Fe3+,Mn2+,Mg)11O19
7.11.31Magnetoplumbite(Pb,Mn)(Fe,Mn)12O19
7.11.32SenaitePb(Mn,Y,U)(Fe,Zn)2(Ti,Fe,Cr,V)18(O,OH)38

Other Names for Coronadite

Name in Other Languages:

Other Information

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
Industrial Uses:
Manganese ore

References for Coronadite

Reference List:
Lindgren and Hillebrand (1904), American Journal of Science: 1: 448.

Lindgren and Hillebrand (1905), USGS Bulletin 262: 42.

Lindgren and Hillebrand (1907), Zs. Kr.: 43: 380.

Lindgren (1933), American Mineralogist: 18: 548.

Frondel, C. and Heinrich, William E.
(1942), American Mineralogist: 27: 48.

Palache, Charles, Harry Berman & Clifford Frondel (1944), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana Yale University 1837-1892, Volume I: Elements, Sulfides, Sulfosalts, Oxides. John Wiley and Sons, Inc., New York. 7th edition, revised and enlarged: 742-743.

Hewett, Donnel Foster (1971): Coronadite – modes of occurrence and origin: Economic Geology: 66: 164-177.

Potter, Russell M. and Rossman, George R. (1979) The tetravalent manganese oxides: identification, hydration, and structural relationships by infrared spectroscopy, American Mineralogist, 64, 1199-1218.

American Mineralogist (1989): 74: 913-917.

Internet Links for Coronadite

Specimens:
The following Coronadite specimens are currently listed for sale on minfind.com.

Localities for Coronadite

map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
Mineral and/or Locality  
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