Refers to sediments of the deep sea that contain terrestrial detritus.
AGI
A triclinic crystal form of two parallel faces with intercepts on two
crystallographic axes.
A monoclinic crystal form of two parallel faces with intercepts on three
crystallographic axes. See also:pyramid
Crystals that appear as if composed of two halves of a crystal turned
partly round and united. Examples of this structure may often be found in
feldspar and cassiterite crystals. Fay
A triclinic mineral, (As,Sb)2 (Ti,V,Fe)12 O23 (OH) ;
metallic to submetallic black; in drill core samples associated with
rutile, pyrite, molybdenite, and arsenopyrite at the Hemlo gold deposit,
ON, Can.
An orthorhombic mineral, Ca3 V12 O32 .12H2 O ;
in black fibrous crystals in Montrose County, CA, and San Juan County, NM.
The treatment of copper sulfide ores by roasting with salt to form
chlorides, which are then leached out and precipitated. Fay
A steel-gray iron sulfide with about 20% cobalt and nickel, (CoNiFe)S (sub
2) . Minute pyritohedral crystals; isometric. Probably a mixture of
siegenite and pyrite. Formerly called cobaltnickelpyrite. From Musen,
Westphalia, Germany. Syn:cobalt-nickel pyrite
Unit of electrical induction. With an electromotive force of 1 V and
current of 1 A/s, one henry (H) = 109 electromagnetic unit.
Symbol H. Pryor, 3
An isometric mineral, Cu4 Ag3 Te4 ; pale blue;
associated with hessite, petzite, sylvanite, altaite, rickardite, and
pyrite at Bisbee, AZ.
A mixture of cinnabar, bituminous material, and clay; liver-brown; may be
flammable.
An amorphous limonite, of a liver-brown color, and containing a small
percentage of copper. Fay
A variety of barite, so called from the fetid odor it exhales when heated.
Standard, 2
Dioctahedral clay mineral. CF:octaphyllite
Having a valence of 7. Also called septavalent; septivalent.
Webster 3rd
A German method of lining roadways subjected to heavy pressures. It
consists of a closed circular arch of specially shaped precast concrete
blocks. The blocks, which are wedge-shaped, are made in two sizes for each
lining and erected in such a way that alternate blocks offer their wedge
action in opposite directions--the larger blocks toward the center of the
roadway and the smaller outward. This arrangement gives a double-wedge
effect so that part of the lateral pressure exerted by the strata on the
lining is diverted axially along the roadway. Nelson
Weak form of dynamite, based on nitroglycerin and a semiactive carrying
dope. Pryor, 3
See:lodestone
An isometric mineral, 8[Fe2+ Al2 O4 ] ; spinel
group; forms series with magnesian spinel, with gahnite, and with
chromite; massive or fine grained; Mohs hardness, 7.5 to 8; in
metamorphosed argillaceous sediments with andalusite, sillimanite, or
garnet; also in contact metamorphic deposits in limestone or marble; in
some eruptive mafic rocks; may occur with corundum to form emery.
Syn:ferrospinel
A monoclinic mineral, 4[CaBe(PO4 )F] , with OH replacing F toward
hydroxylherderite; pseudo-orthorhombic prismatic crystals or radiated
fibrous aggregates; in late-stage pegmatites.