A hexagonal mineral, KAlSiO4 ; polymorphous with kalsilite,
panunzite, and trikalsilite. Syn:facellite; phacellite.
A mixture of limonite with oxides of manganese and silicates of zinc and
lime. Osborne
A trigonal mineral, K2 Sr(SO4 )2 ; occurs in prisms
and plates with anhydrite and dolomite in a drill core from Alshtan,
Bashkir, Russia.
An etching reagent for developing the microstructure of chromium steels
with more than 5% of chromium. It contains 5 g copper chloride, 100 mL
hydrochloric acid, 100 mL alcohol, and 100 mL water. Osborne
A hexagonal mineral, 2[KAlSiO4 ] ; polymorphous with kaliophilite,
panunzite, and trikalsilite; forms a partial series toward nepheline; in
groundmasses of potassium-rich, silica-poor lavas and as an alteration of
blast furnace brick.
A meteorite mineral consisting of the body-centered cubic alpha-phase of a
nickel-iron alloy, with a fairly constant composition of 5% to 7% nickel.
It occurs in iron meteorites as bars or girders flanked by lamellae of
taenite. See also:nickel iron
A grass-green, hydrated, basic copper hydrate and sulfate, Cu3 (OH)
4 SO2 .6H2 O . Syn:brochantite
A chromian variety of clinochlore.
A modification of the Belgian zinc smelting furnace wherein there are two
combustion chambers separated by a central longitudinal wall. In
principle, the furnace is similar to the Hauzeur, a compound furnace.
Burma (Myanmar). A local custom in the gem mines at Mogok that permits
women to work without licenses in streambeds, tailraces, and dumps from
mines and washeries and to keep any gems they find. Hess
Upper Lower Pennsylvanian. AGI
A group of productive coal measures occurring in the Pennsylvanian of the
Appalachian Region and completely developed in Virginia. Sometimes known
as the Upper Pottsville series. CTD
See:kaolin
a. A term used in India for (1) masses or layers of calcium carbonate,
usually occurring in nodules, found in the older alluvium or stiff clay of
the Indo-Gangetic plain; or (2) precipitated calcium carbonate in the form
of cement in porous sediments or as a coating on pebbles. AGI
b. A limestone containing kankar and used for making lime and building
roads. Etymol. Hindi. The term is occasionally applied in the United
States to a residual calcareous deposit, such as caliche. Also spelled
kunkur. AGI
A colloquial term used in south-central Missouri for a chalky, porous,
weathered chert with a white to tan or buff color. Etymol. corruption of
kaolin, to which the material bears a slight resemblance. AGI
Former name for kaolinite. The aluminous minerals of the
kaolinite-serpentine group. Syn:bolus alba; kaoline; kandite; kaolinite;
white clay.
See:kaolin
Of, relating to, or resembling kaolin. Webster 3rd
a. A monoclinic mineral, 2[Al2 Si2 O5 (OH)4 ];
kaolinite-serpentine group; kaolinite structure consists of a sheet of
tetrahedrally bonded silica and a sheet of octahedrally bonded alumina
with little tolerance for cation exchange or expansive hydration;
polymorphous with dickite, halloysite, and nacrite; soft; white; formed by
hydrothermal alteration or weathering of aluminosilicates, esp. feldspars
and feldspathoids; formerly called kaolin.
b. Kandites in general.
c. Individual kandites not specif. designated. See also:alum salt;
kaolin.
The mineral group amesite, antigorite, berthierine, brindleyite,
clinochrysotile, cronstedite, dickite, endellite, fraiponite, greenalite,
halloysite, kaolinite, kellyite, lizardite, manandonite, nacrite,
nepouite, orthochrysotile, parachrysotile, and pecoraite.
CF:serpentine
Replacement or alteration of minerals, esp. feldspars and micas, to form
kaolin as a result of weathering or hydrothermal alteration.
CF:argillation; argillization. AGI