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Formula: PbO2
Simple oxide, paramorph of
plattnerite
Crystal System: Orthorhombic
Specific gravity: 9.867 calculated
Streak: Dark brown
Colour: Dark reddish brown, clove-brown, red on thin edges
Luminescence: Not fluorescent under UV
Environments
Scrutinyite is a secondary
lead oxide occurring in oxidised portions of
lead-bearing deposits closely associated with
plattnerite
(Webmin).
Localities
At the Ojuela Mine, Mapimí, Mapimí Municipality, Durango, Mexico, scrutinyite is associated with
plattnerite, rosasite and
limonite. It occurs in minute quantities within
plattnerite paramorphs after
scrutinyite
(HOM, CM 26.905-910).
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At the type lcality, the Sunshine No. 1 adit, Blanchard Mine, Bingham, Hansonburg District, Socorro County, New Mexico,
USA, scrutinyite was associated with murdochite and
plattnerite. The holotype specimen contains less than 1 mg of material, with
crystals about 25 to 30 microns across and 1 to 2 microns thick. These flakes are red-brown and thin enough to be
translucent. The mineral was deposited during oxidation-stage mineralisation on a matrix of
hypogene fluorite and
quartz on silicified limestone.
Because the Hansonburg District produced the puest material on which virtually all of the testing was performed, and has
the best documentation of location, it is selected as the type locality
(CM 26.905-910).
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