In mining, threadlike veins of ore. Standard, 2
A hexagonal mineral, Ru .
An orthorhombic mineral, UO2 (CO3 ) ; radioactive; earthy
yellow; secondary.
Sagenitic quartz characterized by enclosed needles of rutile.
CF:fleches d'amour; sagenite. Syn:Venus hairstone
See also:sagenitic quartz
a. A tetragonal mineral, TiO2 , in which titanium replaces iron;
trimorphous with anatase and brookite; prismatic; in amphibolites,
ecologites, granite pegmatites, veins, and placers; a source of titanium;
also a gemstone. Syn:red schorl; titanic schorl.
See also:titanium dioxide; zircon group.
b. The mineral group argutite, cassiterite, paratellurite, plattnerite,
pyrolusite, rutile, and stishovite.
See:Rayleigh wave
A mine subsidence theory that is a variant or extension of the vertical
theory. In this theory, allowance is made for movements beyond the
undermined area, but the dip of the beds is considered to be of little or
no influence. Rziha maintained that if rock is undercut, it will stay
undisturbed if cohesion exceeds gravity and will fall if gravity exceeds
cohesion. Briggs
Trade name for banded variscite; may be banded vashegyite and natrolite;
used as a gem stone. Syn:Trainite
a. A supratidal environment of sedimentation, formed under arid to
semiarid conditions on restricted coastal plains just above normal
high-tide level. It is gradational between the land surface and the
intertidal environment. Sabkhas are characterized by evaporite-salt,
tidal-flood, and eolian deposits, and are found on many modern coastlines,
e.g., Persian Gulf, Gulf of California. See also:tidal flat
AGI
b. Any flat area, coastal or interior, where, through deflation and
evaporation, salts crystallize near or at the surface. AGI
c. In the rock record, a sabkha facies may be indicated by evaporites,
absence of fossils, thin flat-pebble conglomerates, stromatolitic laminae,
desiccation features such as mud cracks, and diagenetic modifications, for
example, disrupted bedding, dissolution and replacement phenomena, and
dolomitization. The sabkha environment may have been significant in the
formation of certain petroleum and sulfide-mineral deposits. Etymol:
Arabic. Also spelled: sabkhah. Syn:sebkha
A monoclinic mineral, HAl(UO2 )4 (PO4 )4 .16H
2 O ; autunite group; pseudotetragonal; forms crusts of minute
yellow platy crystals in pegmatites at Sabugal, Portugal.
The anodes used in cathodic protection against corrosion. Hammond
Reducing the extent of corrosion of a metal in an electrolyte by coupling
it to another metal that is electrochemically more active in the
environment. ASM, 1
a. A ridge connecting two higher elevations; a low point in the crestline
of a ridge. A minor upfold along the axis of a syncline; a minor downfold
along the axis of an anticline.
b. A gold-bearing quartz vein of anticlinal form, occurring esp. in
Australian saddle reefs. See also:saddle reef
c. A peculiar formation of sand slate found in shale or sand rock may be
surrounded by soapstone. The under or exposed side of a saddle looks like
natural rock, but its upper side is smooth, having no particular bond with
the sand rock with which it is embedded, and it is liable to fall out of
its place, a fall, however, producing no other derangement of the
surrounding parts of the room from which it falls. Ricketts
d. A hump-shaped piece of roof rock with a smooth back, insecurely
attached to adjacent strata. Also called saddleback. Hudson
a. Eng.; Scot. A roll or undulation in the roof or pavement of a seam.
See also:saddle
b. A hill or ridge having a concave outline along its crest. AGI
A lode or reef bent archwise. Anticline. Pryor, 3
In a dipper shovel, the boom swivel block through which the stick slides
when crowded or retracted. Nichols, 1
a. A mineral deposit associated with the crest of an anticlinal fold and
following the bedding planes, usually found in vertical succession, esp.
the gold-bearing quartz veins of Australia. Syn:saddle vein
AGI
b. Aust. A bedded vein that has the form of an anticline; an inverted
saddle has the form of a syncline. See also:saddle
c. An opening at the crest of a sharp fold in sedimentary rocks, occupied
by ore. Bateman, 2
See:saddle reef
As applied to mining, means freedom from danger, injury, or damage.
Kentucky
a. A worker's belt attachable to some fixed object to safeguard against
falls.
b. A protective belt or harness with remote anchorage, worn by a worker,
for example, a quarryman, working on a face at height. Since the belt
allows a drop of about 6 ft (2 m) a shock absorber is provided.
Nelson
c. A belt worn by a derrickman or tripodman to prevent injury due to
accidental falls from the top of a derrick. Long
d. A belt to which tools are attached to prevent risk of their falling
into machines, thickeners, etc. Pryor, 3
Any mine car or hoisting cage provided with safety stops, catches, or
other precautionary devices. Fay