A schist containing chlorite.
The replacement by, conversion into, or introduction of chlorite.
A monoclinic or triclinic mineral, (Fe,Mg,Mn)2 Al4 Si (sub
2) O10 (OH)4 ; dull green to gray-black; occurs in masses of
brittle folia in metamorphosed argillaceous sedimentary rocks. It is
related to the brittle micas.
A trigonal mineral, K4 MnCl6 ; occurs in yellow rhombohedra.
See:baeumlerite
a. A dark green, nearly black variety of jadeite. Fay
b. A crystal solution of roughly equal amounts of diopside, jadeite, and
acmite.
a. A former name for nontronite.
b. A greenish variety of common opal from Silesia, Poland.
A mineral closely related to chlorite in composition and found in the
groundmass of tholeiitic basalts where it occupies interstices between
feldspar laths, forms pseudomorphs after olivine, or occurs in veinlets
and amygdules. The fresh mineral is pale green, but when weathered, it may
be dark green, brown, or red. AGI
A variety of fluorite that exhibits bright-green phosphorescent light if
heated. Also called cobra stone.
A monoclinic mineral, (Mn,Mg)3 Zn2 (AsO4 )(OH,O) (sub
6) ; occurs in elongated gray-green crystals at Franklin, NJ.
The yellowing of the leaves of plants, sometimes caused by a deficiency of
iron necessary in the formation of chlorophyll. Has been useful as a guide
to ore since nickel, copper, cobalt, chromium, zinc, and manganese are all
antagonistic to iron in plant metabolism. Also may indicate where such
toxins have been added to soil by industrial or other human activity.
The number expressing chlorinity as grams per liter. Obtained by
multiplying the chlorinity of a sample by its density at 20 degrees C.
Hy
A grass-green variety of spinel containing copper.
An orthorhombic mineral, K2 Cu(SO4 )Cl2 ; occurs in
bright-blue crystalline crusts on lava, an alteration product at Mt.
Vesuvius, Italy.
A green orthorhombic hydrated arsenate of copper. CF:mixite
A monoclinic mineral, Pb3 CuCl2 (OH)2 O2 ;
dull-olive or pistachio green.
See:utahlite
a. A square pillar for supporting the roof; constructed of prop timber
laid up in alternate cross-layers, in log-cabin style, the center being
filled with waste. Sometimes called crib. See also:cog;
hydraulic chock.
b. Type of longwall-mining roof support.
c. One of two blocks of hardwood placed across or between rails to prevent
tubs, cars, or wagons from running down an incline.
Newc. Tightly filled up.
Piece of wood, square or rectangular in cross section, usually made of
oak, ash, or other hardwood. Also used to denote a shaped piece of wood
provided with a handle and designed for placing between the rails to hold
back a tub or set of tubs. TIME
A small depression dug in the earth in which a wheel of a truck-mounted
drill rig is set to prevent the drill from moving. Long