Mineral - Coronadit
Coronadit
Chemical Properties
Mineral Class
Oxides and Hydrxides
Toxicity
none
Formula
Pb(Mn⁴⁺₆Mn³⁺₂)O₁₆
Unit Cell
a=9,94 b=2,87 c=9,83 β=90,40° Z=1
Physical Properties
Hardness
4.5 - 5
Streak
blackbrownbrown black
Density
Cleavage
Fracture
splintery,
uneven
Tenacity
Brittle
Optical Properties
Color
blackbrowngray
Birefringence
Luster
Metallic,
Silky,
Earthy
Transparency
opaque
Pleochroism
Geomineralogical Properties
Crystal System
monoclinic
Point Group
Space Group
Habit
crusty, spherical, massive, acicular, kidney-shaped, stalactitic
Formation
Sekundär in der Oxidationszone von primären Manganerzen; hydrothermal
Paragenesis
Twinning
Rarity
Rather rare
Synonyms
Coronadit
Composition
Elements
Mass
MnO₂
60,80
Al₂O₃
0,68
Fe₂O₃
1,10
MnO
7,12
CuO
0,05
ZnO
0,11
PbO
28,66
H₂O
1,11
Arizona
Groups and Members
Hollandit-Supergruppe
Coronadit-Gruppe
Name and first discovery: Named after the Spanish explorer Francisco Vazquez de Coronado (1510 - 1554). First described in 1904.
Chemism:
Synonyms:
Varieties:
Abbreviation: Cor
Famous locations
(TL) Type locality (analysis) Chemical element distribution, see above
USA
(TL) (Analysis) Coronado Mine, Copper Plate Gulch, Greenlee County, Arizona, USA
Germany
Schöne Aussicht Mine, Dernbach, Rhineland-Palatinate, Germany
Mexico
Ojuela Mine, Mapimi, Durango, Mexico
Namibia
Rosh Pinah Mine, Oranjemund, Karas, Namibia
Tsumeb Mine, Oshikoto, Namibia