Lower Lower Miocene. AGI
A generic term for class of hydrated silicates of aluminum and either
sodium or calcium or both, of the type Na2 O.Al2 O3
.nSiO2 .xH2 O . The term originally described a group of
naturally occurring minerals. The natural zeolites are analcite,
chabazite, heulandite, natrolite, stilbite, and thomsonite. Artificial
zeolites are made in a variety of forms, ranging from gelatinous to porous
and sandlike, and are used as gas adsorbents and drying agents as well as
water softeners. Both natural and artificial zeolites are used extensively
for water softening. The term zeolite now includes such diverse groups of
compounds as sulfonated organics or basic resins, which act in a similar
manner to effect either cation or anion exchange. CCD, 2
The dachiardite group of zeolites.
a. A base exchange method of treating hard water, in which zeolites,
contained in a tank, remove salts. The zeolite layer is regenerated by
backflushing with brine. Nelson
b. See:base exchange
A deposit, particularly of native copper, that occurs in basalt
accompanied by minerals of the zeolite group.
Introduction of, alteration to, or replacement by, a mineral or minerals
of the zeolite group. This process occurs chiefly in rocks containing
calcic feldspars or feldspathoids, and is sometimes associated with copper
mineralization. AGI
A triclinic mineral, Ca4 Si3 O8 (OH,F)4 .2H
2 O ; pseudohexagonal; forms white spherical, radiated folia; at
Cross-Preisen, Bohemia, Czech Republic.
The curve showing the zero air voids unit weight as a function of water
content. Syn:saturation curve
The weight of solids per unit volume of a saturated soil mass.
See also:unit weight
Special type of gravimeter spring for which the length is proportional to
the applied force. Schieferdecker
The kinetic energy remaining in a substance at a temperature of absolute
zero. Webster 3rd
The actual potential at the surface of the Earth taken as a point of
reference. Webster 3rd
When conducting a mine ventilation pressure survey, zero time is the time
of the commencement of the survey from the base station, and the reading
of the control barometer there is taken as the pressure datum to which
subsequent pressures are referred. Sinclair, 1
A condition wherein a drilling fluid fails to form measurable gels during
a quiescent 10-min time interval. Brantly, 1
The potential difference across an electric double layer, usually between
a solid surface and a liquid. Syn:electrokinetic potential
See also:surface
The zone of shear surrounding a particle immersed in an electrolyte.
Pryor, 4
A tetragonal mineral, Cu(UO2 )2 (AsO4 )2 .10H
2 O ; autunite group.
See:ceylonite
A trigonal mineral, NaMg(Al,Fe)(C2 O4 ).8H2 O ; an
oxalate occuring in green crystals that appear violet in artificial light;
in veinlets in coal in the Chaitumusuk deposits, Siberia, Russia.
The extraction of silver from sulfide ores or matte by roasting in such a
way as to form sulfate of silver, leaching this out with hot water, and
precipitating the silver by means of metallic copper. Fay
Incorrect spelling of pietricikite, a waxlike hydrocarbon similar to
ozokerite. Tomkeieff