A sandstone containing iron oxide as the cementing material, as grains, or
both.
Parallel orientation of feldspar prism edges with the edge between two
adjacent rhombohedral planes of quartz in graphic granite so that the c
axis of the quartz forms an angle of 42 degrees 16' with the c axis of the
feldspar. Hess
An orthorhombic mineral, (Ca,Ce,Na)(Nb,Ta,Ti)2 (O,OH,F)6 ;
weakly radioactive; in syenites, may be associated with pyrochlore, alkali
hornblende, apatite, sphene, magnetite, zircon, xenotime, or allanite;
also in some marbles with columbite and monazite.
See:davidite
A monoclinic mineral, Fe4 (VO4 )4 .5H2 O ;
golden brown; in uranium-vanadium deposits of the Colorado Plateau.
An instrument in which heat radiated from the hot body is focused, by
means of a concave mirror, on a small central hole behind which a small
thermocouple is placed in front of two small, inclined mirrors. The
instrument is sighted onto the hot body and focused by rotating a screw
until the lower and upper halves of the image coincide; the electromotive
force generated by the thermocouple is indicated on a galvanometer. The
instrument, once focused, gives continuous readings and may be connected
to a recording indicator. Osborne
The unobstructed distance that the wind can travel to any point when
raising waves. Hammond
Having a disagreeable odor caused by the occurrence of certain bituminous
substances or of hydrogen sulfide. This odor is apparent when some
varieties of limestone and quartz are broken or are rubbed vigorously.
A variety of calcite that emits an offensive odor when dissolved in dilute
hydrochloric acid. The odor is due to trace sulfides and other impurities.
See:swinestone
a. To cover or line the hearth of (a reverberatory furnace) with fettling.
Webster 3rd
b. To clean and smooth (as a metal or plastic) after casting or molding.
Webster 3rd
c. To remove fins, mold marks, and rough edges from dry, or nearly dry,
ware. ACSG, 2
a. Protecting the bottom of the open-hearth furnace with loose material,
such as ore, sand, etc.; also, the material so used. Henderson
b. The process of repairing a steel-furnace hearth, with dead-burned
magnesite or burned dolomite, between tapping and recharging the furnace.
Dodd
See:firestone
See:fea
The smallest single strand of asbestos or other fibrous material.
Mersereau, 2
A single fiber, which cannot be separated into smaller components without
losing its fibrous properties or appearance. Campbell
The texture of metamorphic rocks resulting from the development during
recrystallization of minerals with a fibrous habit.
See also:nematoblastic
A monoclinic mineral, Fe(SO4 )(OH).5H2 O ; forms fine
fibrous crusts or masses associated with melanterite, copiapite, jarosite,
and other secondary sulfates.
See:pulmonary dust
a. A fibrous, felted variety of sillimanite.
b. One of three crystalline forms of aluminum sillicate, Al2 SiO
5 , the others being andalusite (low temperature) and kyanite (high
temperature). Sillimanite occurs commonly as felted aggregates of
exceedingly thin fibrous crystals (hence the name fibrolite) in contact
metamorphosed aluminous sediments such as mudstones, shales, etc. Crystals
of a pale sapphire blue are used as gems. CTD
A pale greenish variety of sillimanite having fibrous inclusions; when
cut, produces a chatoyant effect, but not a well-defined cat's-eye.
a. Applied to minerals that occur as fibers, such as asbestos.
Syn:asbestiform
b. Consisting of fine threadlike strands, e.g., satin spar variety of
gypsum.