Native tin. Syn:gediegen
A monoclinic mineral, KLiFeAl(AlSi3 )O10 (F,OH)2 ;
mica group; basal cleavage; pale violet, yellowish or grayish brown; in
granites, pegmatites, and greisens.
An orthorhombic mineral, K4 (UO2 )6 (SO4 )
3 (OH)10 .4H2 O ; radioactive; orange-yellow to bright
yellow; an alteration product of uraninite occuring with gypsum,
uranopilite, and limonite. Formerly called dauberite.
Trade term for a conveyor belt lacing or fastening appliance, which can be
applied to any thickness and width of belt. A lever mechanism is used to
supply the pressure. The appliance is totally enclosed and grease-filled
to protect against dust and damage. Nelson
A tetragonal mineral, ZrSiO4 ; occurs widely in granite, granite
pegmatite, other felsic igneous rocks, and placers; the chief source of
zirconium; a refractory; if cut and polished, the colorless varieties
provide exceptionally brilliant gemstones. Syn:azorite; zirconite;
hyacinth; jacinth.
Finely milled zircon sand. CCD, 2
Zircon, along with rutile, ilmenite, and monazite, constitutes a group of
heavy minerals that are usually considered together because of their
occurrence as black sands in natural beach and dune concentrations. For
marketing, complete separation of the rutile and zircon as high-grade
products is necessary. Separation is effected by combinations of
electromagnetic and electrostatic processes, together with gravity
concentration.
Brick containing zirconium oxide; used in metallurgical furnaces.
Bennett
a. Containing zircon or yielding zircon. Webster 3rd
b. Containing zirconium or yielding zirconium. Webster 3rd
A gray or brownish variety of zircon.
A grayish-white lustrous metallic element. Symbol, Zr. Occurs widely, but
only in combined form, esp. in the minerals zircon, (ZrSiO4 ), and
baddeleyite, (ZrO2 ). Uses include resisting corrosion, as a
structural material in nuclear reactors, as an alloying agent, deoxidizer,
bonding agent, refractory material, and in low-temperature superconductive
magnets. Handbook of Chemistry and Physics, 3
Principal ore minerals are zircon and baddeleyite. Main uses are as
refractories, ceramics, opacifiers, abrasives, enamels, insulators, and
alloys. They are also a source of hafnium. Transparent zircon is a
gemstone.
Normal zirconium phosphate, ZrP2 O7 , has a reversible
inversion at 300 degrees C and at 1,550 degrees C dissociates into
zirconyl phosphate, (ZrO)2 P2 O7 , with loss of P
2 O5 as vapor. Zirconyl phosphate is stable up to about 1,600
degrees C and has a very low thermal expansion--1 x 10-6 (20 to
1,000 degrees C). Dodd
ZrSiO4 , natural silicate of zirconium found in Brazil and
elsewhere. One such deposit known as brazilite is said to contain about
80% zirconium oxide in a semimanufactured form. This product is employed
as a refractory in the making of "zirkite" bricks and cement. In rare
cases, used as a cobalt groundcoat constituent. Zirconium silicate is used
in formulation of zircon enamels that depend upon crystallization of
zircon compounds for opacity development. See also:zircon sand
Enam. Dict.
A pigment for use in ceramic glazes. The composition is (parts by weight):
ArO2 , 60% to 70%; SiO2 , 26% to 36%; V2 O5 ,
3% to 5%. Alkali must also be present; e.g., 0.5% to 5% Na2 O. In
the absence of alkali, a green color is produced.
Syn:vanadium-zirconium turquoise
A discredited syn. of zirkelite.
a. A very refractory mineral, composed chiefly of zirconium silicate,
having low thermal expansion and high thermal conductivity. ASM, 1
b. A natural zircon-bearing material found in Australia, India, and
Florida. See also:zirconium silicate
a. A monoclinic mineral, (Ca,Th,Ce)Zr(Ti,Nb)2 O7 ;
pseudocubic; dimorphous with calciobetafite of the pyrochlore group;
radioactive; occurs in pyroxenite and alluvial deposits.
b. An obsolete name for altered basaltic glass.
A trade name for a mixture of zircon and baddeleyite. USBM, 7
A trigonal mineral, (Fe,Mg)9 Al4 Cl18 (OH)12
.14H2 O ; massive fine granular; at Hanover, Germany.
An orthorhombic mineral, CaAl3 (SiO4 )3 (OH)] ;
epidote group; dimorphous with clinozoisite; vitreous or pearly;
varicolored; a common rock-forming mineral in medium-grade metamorphic
rocks. The rose-red variety has been called thulite.