A curved line connecting the points of the maximum destructive energy of
an earthquake shock around its epicenter. Standard, 2
A prefix meaning dark-colored. AGI
An earthy variety of tenorite. See also:black copper ore; tenorite.
An early name for albertite. Tomkeieff
A bituminous substance found in masses in the brown coal of Zweifelsruth,
Bohemia, former Czechoslovakia. That part of this substance that is
soluble in alcohol is termed rochlederite, the residue melanellite. Also
spelled melanchym. Fay
That portion of melanchyme that is insoluble in alcohol; it is black and
gelatinous. Fay
a. Diamonds of mixed sizes. Hess
b. An assortment of mixed sizes of diamonds weighing more than 1/4 carat;
e.g., larger than those of a melee.
c. A body of rock mappable at a scale of 1:24,000 or smaller,
characterized by a lack of internal continuity of contacts or strata and
by the inclusion of fragments and blocks of all sizes, both exotic and
native, embedded in a fragmental matrix of finer-grained material. Neither
matrix composition and fabric nor genesis is significant for the
definition.
See:melanocratic
A titanian variety of andradite. Syn:black andradite garnet; pyreneite.
Applied to dark-colored rocks, esp. igneous rocks, containing between 60%
and 100% dark minerals; i.e., rocks, the color index of which is between
60 and 100. CF:hypermelanic; leucocratic; mesocratic. AGI
A trigonal mineral, Mn2 SbFeO6 . Originally named
melanostibian.
An orthorhombic mineral, Pb2 Fe2 Si2 O9 ;
forms a series with kentrolite.
A triclinic mineral, CaV4 O10 .5H2 O ; a natural
vanadium bronze with perfect prismatic cleavage; at Cerro de Pasco, Peru,
and on the Colorado Plateau.
a. A monoclinic mineral, FeSO4 .7H2 O ; green; tastes
slightly sweet, astringent, and metallic; from the decomposition of
pyrite.
b. The mineral group bieberite, boothite, mallardite, melanterite, and
zincmelanterite. Syn:copperas; green vitriol; iron vitriol.
The narrowest part of an isogyre in an interference figure representing
the point of emergence of an optic axis. CF:interference figure
a. A collective term for small round faceted diamonds, such as those
mounted in jewelry. The term is sometimes applied to colored stones of the
same size and shape as the diamonds. AGI
b. A small diamond cut from a fragment of a larger size. AGI
c. In diamond classification, a term for small round-cut diamonds weighing
more than 1/4 carat. CF:melange
a. A tetragonal mineral in the series akermanite, Ca2 MgSi2
O7 -gehlinite, Ca2 Al(AlSi)O7 .
b. The mineral group akermanite, gehlenite, hardystonite, and melilite.
Jeffreyite, leucophanite, and meliphanite are structurally similar. Also
spelled mellilite.
A generally olivine-free extrusive rock composed of melilite and
clinopyroxene (or other mafic mineral) usually comprising more than 90% of
the rock, with minor amounts of feldspathoids and sometimes plagioclase.
AGI
a. A high explosive similar to lyddite; said to be chiefly picric acid.
Webster 2nd
b. A species of soft, unctuous clay, common in Bavaria, and probably
identical with bole. Standard, 2
A tetragonal mineral, (Ca,Na)2 Be(Si,Al)2 (O,OH,F)7 ;
structurally similar to the melilites. Also spelled meliphane.
Syn:gugiaite
Small cut diamonds, usually about one-eighth carat. Generally refers to
stones used in jewelry. Hess