Jump to content

Coronadite

From Wikipedia, the free encyclopedia

This is an old revision of this page, as edited by Ptinphusmia (talk | contribs) at 23:05, 12 July 2020 (+Photo #WPWP #WPWPNG). The present address (URL) is a permanent link to this revision, which may differ significantly from the current revision.

coronadite
Coronadita
General
Categoryhydroxides
Formula
(repeating unit)
Pb(Mn4+6Mn3+2)O16
Strunz classification4/D.08-70
Dana classification7.9.1.4
Crystal systemmonoclinic
Space groupI2/m
Unit cella=9.938, b=2.8678, c=9.834, Z = 1; β= 90.39° V = 280.26
Identification
Formula mass933.55
Colourdark grey to black
Crystal habitBotryoidal; fibrous
Mohs scale hardness4.5-5
Lustersubmetallic
Streakbrownish black
Diaphaneityopaque
Density5.44
Refractive index2.72?
Pleochroismbrown-grey
Common impuritiesFe, Al

Coronadite is a black monoclinic mineral containing a ternary oxide of lead and manganese in two oxidation states. The mineral was named after Francisco Vasquez de Coronado who was an explorer of southwest USA. The name was made up by Waldemar Lindgren in 1905.[1]

References

  1. ^ "Coronadite Mineral Data". webmineral.com.