a. Ground left, in first cutting a vein, for support of its sides.
b. Also, a gage stone handset in the outside surface or wall of the metal
shank of a diamond bit. Syn:gage stone
See:gage stone
Short struts to prevent a sill or other member from being pushed out of
place. Stauffer
The place in a borehole where the first intentional deviation starts.
Sometimes abbreviated KOP. Long
The amount of energy required to crush a given quantity of material to a
specified fraction of its original size is the same no matter what the
original size. CF:Rittinger's law
A reuniform variety of hematite with concentric or radiating structure.
Syn:kidney stone; kidney ore. See also:iron ore
See:kidney iron ore
A mineral zone that contracts, expands, and again contracts downwards.
AGI
a. See:nephrite; kidney iron ore; urolith.
b. Any reniform nodule.
See:lense
A general term for the sulfide ores, adopted into English from the
original German.
See:diatomite
a. A monoclinic mineral 4[MgSO4 .H2 O] ; in evaporite salt
deposits from dehydration of epsomite or decomposition of kainite.
Syn:martinsite
b. The mineral group dwornikite, gunningite, kieserite, poitevinite,
szmikite, and szomolnokite.
See:geochronite
A orthorhombic mineral, Ca3 Si2 O7 ; dimorphous with
rankinite, which it replaces at Kilchoan, Ardnamurchan, Scotland.
See:anthracite
To mix atmospheric air with combustible gases or other gases so as to make
them harmless. Fay
a. Corn. The slates or schists that form the country rock of the Cornish
tin veins.
b. Corn. Term used in the china-clay mines for the altered schistose or
hornfelsic rocks in contact with the granite and often considerably
modified by emanations from the latter. Dodd
Steel treated with a strong deoxidizing agent, such as silicon or
aluminum, to reduce the oxygen content to such a level that no reaction
occurs between carbon and oxygen during solidification. ASM, 1
a. Allowing the molten steel to remain in the crucible for about 45 min
for the escape of the gases. Mersereau, 2
b. In metallurgy, esp. in foundry terminology, a term for deoxidation.
Gaynor
a. A large furnace used for baking, drying, or burning firebrick or
refractories, or for calcining ores or other substances. ASM, 1
b. A furnace or oven, which is usually made from refractory brick, used to
dry and fire various types of ceramic ware.