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
(Horseshoe Mine), Coronado Mine (Coronado Mining Co. property; Arizona
Copper Co. group [in part]), Coronado vein, Copper Plate Gulch, Copper
Mountain District (Clifton-Morenci District), Shannon Mts, Greenlee County,
is a black metallic lead manganese oxide mineral that
is a member of the Coronadite Group of minerals that
also includes Hollandite,
among others. Coronadite gems are somewhat rare only
because there is little demand for them other than as
an unusual collector gem. Faceted gems are rather attractive
however, with dark gray to black color and submetallic
luster that looks white in reflected light.
was first described and named in 1904 by Waldemar Lindgren and William F. Hillebrand from
material found on
the dump of a small mine shaft on the west end of the Coronado
vein, three-fourths of a mile west of Horseshoe shaft
of the Coronado Mine, Clifton-Morenci district, Greenlee
County, Arizona, USA. Lindgren and Hillebrand proposed
the name "Coronadite" to honor Francisco Vasquez de Coronado (1510-1554), a Spanish
conquistador and explorer of the American southwest
who had visited the region in 1540.
Hillebrand said: "We propose the name Coronadite,
after the famous explorer of that portion of the American
continent from which the Territories of New Mexico and
Arizona have been formed." They described Coronadite
as "a black metallic mineral, not unlike Psilomelane in
general appearance, and intemately intermixed with Quartz,
is found in fairly large amount in the Coronado vein."
distribution: Widespread; a few localities for pure
or well-characterized material include: in the USA,
in Arizona, from the Coronado vein, Clifton-Morenci
district, Greenlee County; the Magma mine, Superior,
Pinal County; from the Artillery Mountains, Mohave County,
and elsewhere. In New Mexico, from the Luis Lopez district,
Socorro County. From the Philipsburg district, Granite
County, Montana. In Mexico, from the Talamantes district,
Chihuahua, and in the Ojuela mine, Mapimí, Durango.
At many places in the Ouarzazate and Oujda districts,
and elsewhere in Morocco. From the Almalyskoye Pb–Zn
deposit, Kurgashikan, Uzbekistan. In the Dry Gill mine,
Caldbeck Fells, Cumbria, England. In France, from the
Richesse mine, near Bourgeten-Huile, Savoy. At Dongari
Buzurg, Bhandara, Madhya Pradesh, and Kodur, Andhra
Pradesh, India. From Broken Hill, New South Wales, and
in the Puttapa zinc mine, near Beltana, South Australia.
At Tsumeb, Namibia.