See:digenite
See:azurite; covellite.
See:azurite
See:blue ground
a. A gold-iron alloy containing 25% to 33.3% iron. Camm
b. A bluish collodial solution of gold prepared by reducing a solution of
gold chloride with hydrazine hydrate. Camm
See:larvikite
Unoxidized slate-blue or blue-green kimberlite, usually a breccia (as in
the diamond pipes of South Africa) that is found below the surficial
oxidized zone of yellow ground. CF:hardebank
AGI
See:vivianite
A bluish iron-bearing mineral; specif: crocidolite and vivianite.
a. A term for metallic lead in the lead industry to distinguish it from
lead compounds with color designations, such as white lead, orange lead,
and red lead. See also:lead
b. A synonym of galena, esp. a compact variety with a bluish-gray color.
Syn:galena; blue lead ore. AGI
c. A bluish, gold-bearing lead or gravel deposit found in Tertiary river
channels of the Sierra Nevada, CA. Pronounced "blue leed." AGI
An old name for a compact variety of galena with a bluish-gray color.
Pron: led.
An erroneous name for azurite.
A term used in England for a hard bluish-gray shale or mudstone lying at
the base of a coalbed and often containing pyrite. AGI
a. An ocean-bottom deposit containing up to 75% terrigenous materials of
dimensions below 0.03 mm. The depth range occurrence is about 750 to
16,800 ft (229 to 5,120 m). Colors range from reddish to brownish at the
surface, but beneath the surface, the colors of the wet muds are gray to
blue. AGI
b. A common variety of deep-sea mud having a bluish-gray color due to
presence of organic matter and finely divided iron sulfides. Calcium
carbonate is present in amounts up to 35%. AGI
Applied in the grading of quartz crystals to needlelike imperfections,
often definitely oriented, which show up with a bluish-white color under
the carbon arc. The color is due to the selective scattering of blue light
by the minute imperfections. Am. Mineral., 2
See:vivianite
A mixture of finely divided and partly oxidized metallic zinc formed by
the condensation of zinc vapor into droplets; also, any similar zinc
byproduct (such as dross, skimmings, or sweepings). Webster 3rd
See:sapphire quartz
The hard, bluish-gray, Ordovician bedded phosphates of central Tennessee.
The first room in a baghouse. Fay
a. Blue tourmaline. Fay
b. The earliest name for anatase (octahedrite).