Red shale, Shropshire, United Kingdom. See also:calamanco
Thin veins of calcium carbonate running through the coal. Also spelled
simon strings.
A syn. of horseback, named after such a structure in the Coalbrookdale
coalfield of England that was originally thought to be a large fault.
See also:horseback
A modified gyratory crusher used in secondary ore crushing that consists
of a downward-flaring bowl within which is gyrated a conical crushing
head. The main shaft is gyrated by means of a long eccentric that is
driven by bevel gears. See also:gyrasphere crusher
A mill in which the crushing is done between two cup-shaped plates that
revolve on shafts set at a small angle to each other. These disks revolve
with the same speed in the same direction and are so set as to be widest
apart at the bottom. Feed is from the center, and the material is
gradually crushed as it nears the edge and is then thrown out by
centrifugal force. Liddell
a. Detonation of an explosive material by means of an impulse from another
detonation through air, earth, or water. Dick, 1
b. The initiation of an explosive charge without a priming device by the
detonation of another charge close by. Syn:flash over
Said of a rock texture produced by the intimate intergrowth of two
different minerals; sometimes the term is restricted to such textures of
secondary origin. One of the minerals may assume a vermicular habit. Also,
said of a rock exhibiting such texture, or of the intergrowth itself;
i.e., symplectite. Also spelled: symplektic; symplectitic; symplektitic.
CF:dactylitic
An intimate intergrowth of two different minerals, sometimes restricted to
those of secondary origin; also, a rock (igneous or thermally
metamorphosed) characterized by symplectic texture. Also spelled:
symplektite. CF:pegmatite
A triclinic mineral, Fe3 (AsO4 )2 .8H2 O ;
vivianite group; dimorphous with parasymplesite; soft.
A triclinic mineral, (Mn,Mg,Ca,Pb)9 (AsO3 )(AsO4 )
2 (OH)9 .2H2 O(?) ; pseudo-orthorhombic.
Proposed by Sederholm and applied to those primary minerals in igneous
rocks that are formed by the reaction of two other minerals, as in
kelyphite rims, reaction rims, etc. Johannsen
A rare, weakly radioactive, orthorhombic or monoclinic mineral,
Ca(Ce,Nd,Y,La)(CO3 )2 F , usually found in pegmatites
associated with aegirite, microcline, astrophyllite, fluorite, gadolinite,
xenotime, cordylite, and catapleiite. May be related to parisite. Also
spelled synchysite. Crosby
A silent-shift transmission construction in which hub speeds are
synchronized before engagement by contact of leather cones.
Nichols, 1
See:synchronous
The state of being synchronous or simultaneous; coincident existence,
formation, or occurrence of geologic events or features in time, such as
glacial synchroneity. Syn:synchronism
See:synchronous
The state when the phase difference between two or more periodic
quantities is zero; they are then said to be in phase.
See:synchroneity
Occurring, existing, or formed at the same time; contemporary or
simultaneous. The term is applied to rock surfaces on which every point
has the same geologic age, such as the boundary between two ideal
time-stratigraphic units in continuous and unbroken succession. It is also
applied to growth (or depositional) faults and to plutons emplaced
contemporaneously with orogenies. CF:isochronous; diachronous.
Syn:synchronal; synchronic. AGI
This type of motor has a stator similar to a squirrel cage motor, but the
rotor has a direct-current field winding with salient poles equal in
number to the stator poles. The direct current is supplied to the field
winding through slip rings. In addition to the direct-current field
windings, the rotor normally has a squirrel cage (amortisseur) winding
that is used for starting. Pit and Quarry
Orthorhombic minerals, synchysite-(Ce) CaCe(CO3 )2 F ,
synchysite-(Nd) CaNd(CO3 )2 F , and synchysite-(Y) CaY(CO
3 )2 F (doverite) of the bastnaesite group; pseudohexagonal.
See:doverite