See:quicksilver
See:awaruite; josephinite.
See:formation water
A monoclinic mineral, NaCO3 ; occurs in very soluble, white,
granular masses; a rare mineral in the alkalic complexes of the Kola
peninsula, Russia.
See:sodium
A monoclinic mineral, NaCu2 (SO4 )2 (OH).H2 O;
bright emerald-green; forms steep pyramidal crystals; a secondary copper
mineral at Chuquicamata, Chile.
A trigonal mineral, NaFe3+3 (SO4 )2 (OH)
6 ; alunite group; in earthy masses and minute scales; a common
alteration product in pyrite-bearing deposits. Formerly called utahite.
An orthorhombic mineral, Na16 [Al16 Si24 O80].16H2 O;
zeolite group, which may contain appreciable calcium;
dimorphous with tetranatrolite; forms acicular to slender prismatic
crystals in cavities and veins, esp. in mafic and alkaline igneous rocks.
Syn:laubanite
A triclinic mineral, (Na,Li)Al(PO4 )(OH,F) ; amblygonite group; in
granitic pegmatites associated with other lithium minerals. Formerly
called fremontite.
A monoclinic mineral, Na2 CO3 .10H2 O ; very soluble;
forms earthy or granular crusts and efflorescences; in nonmarine
evaporites and on lavas.
Granite abormally high in soda, presumably from the presence of a
soda-rich orthoclase or of anorthoclase. It is also called soda granite.
Eng. To make a slight rattling or tapping noise. Said of a mine when
movement or settling is taking place. Webster 3rd; Fay
An air crossing in which two airways are separated by rock in its natural
state. BS, 8
Asphalt before crushing or refining, as mined or quarried in the case of
natural rock asphalt, or surface-excavated in the case of lake deposits.
Hammond
Carbon found in a shape that has not been artificially modified. Also
called natural stone. Long
A hydraulic cement produced by pulverizing and then heating naturally
occurring rock (cement rock) containing appropriate proportions of
limestone, clay, magnesia, and iron. Ignition temperatures are usually
lower than for portland cement. Final pulverizing is necessary as with
portland cement.
Coke made by natural processes, usually by the intrusion of an igneous
dike. See also:cinder coal; clinker; coke coal; cokeite. Hess
See:convection
This abrasive is the densest form of crystallized carbon, the hardest
substance known. It occurs most commonly as well-developed crystals in
volcanic pipes or in alluvial deposits. Bort (boart or borts) sometimes
refers to all diamonds not suitable for gems, or it may refer to
off-color, flawed, or impure diamonds not fit for use for gems or most
other industrial applications, but suitable for the preparation of diamond
grain and powder for use in lapping or the manufacture of most diamond
grinding wheels. This type of bort is also called crushing bort or
fragmented bort. ACSG, 2
Electric current in the Earth not due to human activity.
Schieferdecker