It occurs in the oxidized zone of lead and molybdenum deposits.
Plumbojarosite, a widespread iron and lead sulfate mineral, PbFe6(So4)4(OH)12, that has been found in the oxidized zone of lead deposits, particularly in arid regions.
It occurs with galena, cerussite, and limonite in the oxidized zone of lead deposits, where it forms very brightly coloured, heavy, barrel-shaped crystals or globular masses.
At a meeting of the restorers, a PowerPoint image magnified a zone of lead white that resembled a sun-fissured mud flat, the raised, or "tented," edges of the cracks having been knocked off by previous cleanings, which, however, had missed ugly brown puddles of decayed varnish.
It is found with the other form, massicot, as dull or greasy, very heavy, soft, red crusts in the oxidized zone of lead deposits, as at Cucamonga Peak and Fort Tejon, Calif., U.S., and near Hailey, Idaho, U.S. For mineralogic properties, see oxide mineral (table).
The mineral's typical occurrences are as orange, red, or brown hairlike or barrel-shaped crystals in the oxidized zone of lead deposits as in the Urals, Russia; Transvaal, S.Af.; Chihuahua, Mex.; and Arizona, U.S. Endlichite is a highly arsenious variety; the complete substitution of arsenic for vanadium in the crystal structure forms the mineral mimetite.
Vanadinite occurs as a secondary mineral in the oxidized zone of lead-bearing deposits, the vanadium is leached from wall-rock silicates.
These minerals occur with vanadinite in the oxidized zone of copper and lead deposits, as in the Otavi region, Namibia, where they are abundant; San Luis Potosi, Mex.; Baden, Ger.; and New Mexico.
And once we did we were happy to stay in the comfort zone of defending our lead.
Composition occurs in a zone of intimacy, which leads people to write things they might not otherwise risk broadcasting to the world.
In other words, the lowering of Fermi level and its entry into the zone of impurity levels leads to their emptying, that is thermodynamically unfavorable for material.
