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Formula: Ba(Ti6Cr3+2)O16
Oxide, priderite group,
hollandite supergroup, barium-
and titanium- bearing mineral
Crystal System: Tetragonal
Specific gravity: 3.72 measured, 4.413 calculated
Hardness: 6 to 7
Streak: White, grey
Colour: Green, yellow, black
Environments
Redledgeite has been compared with mannardite from the Rough claims, Kechika
River, Sifton Pass, Liard Mining Division, British Columbia, Canada. Extensive tests indicated that redledgeite is
isostructural with, but more fully ordered than, mannardite, and redledgeite
is the chromium analog of mannardite
(CM 24.55-66).
Localities
At the type locality, the Red Ledge mine, Washington, Washington Mining District, Nevada County, California, USA,
redledgeite is associated with chromite and
knorringite
(Mindat).
A re-examination of holotype redledgeite has shown it to be intimately and finely intergrown with light pink crystals
of chromium-bearing clinochlore. A
second specimen of redledgeite, recently collected from
the type locality shows small black elongate grains of redledgeite in a groundmass of translucent, light green,
extremely fine-grained acicular tetragonal crystals. These minute needles are 0.5 microns thick and cling with great tenacity
to the larger crystals of redledgeite
(CM 24.55-66).
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