A black, massive, asphaltic pyrobitumen; sectile and infusible; closely
related to uintahite; insoluble in turpentine; derived from metamorphosed
petroleum; occurs in veins in Uinta County, UT. See also:elaterite
A trigonal and hexagonal mineral, (Zn,Fe)S ; dimorphous with sphalerite;
resinous; brownish black; forms hemimorphic pyramidal crystals or
radiating needles and bundles within lamellar sphalerite.
See also:alpha zinc sulfide; zinc sulfide.
Two polytypes, 8ZnS and 10ZnS, respectively, of wurtzite found at Joplin,
MO; hexagonal. The wurtzite polytypes evidently form a homologous series
(2H, 4H, 6H, etc.) resulting from growth phenomena based on screw
dislocations. Am. Mineral., 1
A mineral, FeO. Artificially prepared specimens are characteristically
deficient in iron. Also spelled wustite. Syn:iozite
An orthorhombic mineral, Ca3 U(UO2 )6 (CO3 )
2 (OH)18 .3-5) H2 O ; violet-black; occurs with
ianthinite altered from uraninite; at Shinkolobwe, Katanga, Republic of
the Congo.
See:wich
a. Cumb. The beam-end connection above the pump rods of a winding and
pumping engine. Fay
b. A cast or wrought fitting that has one side outlet at any angle other
than 90 degrees . The angle is usually 45 degrees , unless another angle
is specified. The fitting is usually indicated by the letter Y.
Strock, 1
A swelling type of bentonite that absorbs about eight times its dry volume
of water to form a gel. See also:bentonite
A rose-pink variety of grossularite garnet. Also called rosolite;
landerite. From Xalostoc, Morelos, Mex. English
Common specific promoter used in flotation of sulfide ores. A salt or
ester of xanthic acid made of an alcohol, carbon disulfide, and an alkali.
A monoclinic mineral, Ni3 (AsO4 )2 ; sulfur-yellow.
a. An alteration product of titanite (sphene).
b. See:anatase
Amorphous cadmium sulfide. See also:greenockite
A monoclinic mineral, Ag3 AsS3 ; dimorphous with proustite;
brilliant red, orange-yellow to brown. Syn:rittingerite
See:clintonite
A yellow altered variety of allanite that contains considerable water.
Standard, 2
A triclinic mineral, Ca4 Fe2 (PO4 )4 (OH) (sub
2) .3H2 O ; wax-yellow; forms thin plates; at Rabenstein, Bavaria,
Germany.
An early name for heliotrope. Hey, 3
a. The axis of abscissas in a plane Cartesian coordinate system. Commonly
written x-axis. Webster 3rd
b. One of the three optic axes (x, y, and z) in a biaxial crystal. The
x-axis is the axis of a greatest ease of vibration. Light vibrating
parallel to the x-axis travels with maximum velocity and is called the
fast ray, the x-ray (not to be confused with the penetrating X-rays of
extremely short wavelength), and the alpha -ray. The lowest index of
refraction nalpha . in biaxial minerals is the index of the fast
ray vibrating parallel to the x-axis.
c. One of three axes in a three-dimensional coordinate system.
Crystallographers customarily use a right-handed system with the z-axis
oriented positive upward, the y-axis positive to the right, and the x-axis
positive toward the viewer. For mineral parameters the x-axis is labeled a
with periodic translations t
with periodic translations t
with periodic translations t
with periodic translations t
with periodic translations t
with periodic translations t
with periodic translations t
with periodic translations t
with periodic translations t
with periodic translations t
with periodic translations t
with periodic translations t
with periodic translations t
with periodic translations t
with periodic translations t
with periodic translations t
with periodic translations t
with periodic translations t
with periodic translations t
with periodic translations t
with periodic translations t
with periodic translations t
with periodic translations t
with periodic translations t
with periodic translations t
with periodic translations t
with periodic translations t
with periodic translations t
with periodic translations t
with periodic translations t
with periodic translations t
with periodic translations t (sub 1.
a. An abscissa in a plane Cartesian coordinate system. Webster 3rd
b. One of the three coordinates in a three-dimensional rectangular
coordinate system. Webster 3rd
One of three orthogonal optic directions in biaxial crystals. Light with
its electric vector (vibration direction in early terminology) parallel to
the x-direction has the lowest refractive index (nalpha ) for a
given crystal and is called the fast ray. In orthorhombic crystals, the
x-axis is constrained by symmetry to correspond to one of the
crystallographic directions, the correspondence determined empirically. In
monoclinic crystals, one optic direction, commonly the y-direction, is
constrained by symmetry to correspond to the unique diad. In triclinic
crystals, there is no symmetrical constraint relating optic directions to
crystallographic axes.