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Webster 1913 Edition
Amygdaloid
A-myg′da-loid
,Noun.
[Gr. [GREEK] almond +
-oid
: cf. F. amygdaloïde
.] (Min.)
A variety of trap or basaltic rock, containing small cavities, occupied, wholly or in part, by nodules or geodes of different minerals, esp. agates, quartz, calcite, and the zeolites. When the imbedded minerals are detached or removed by decomposition, it is porous, like lava.
Webster 1828 Edition
Amygdaloid
AMYG'DALOID
,Noun.
Toad-stone; a compound rock, consisting of a basis of basalt, greenstone or some other variety of trap, imbedding nodules of various minerals, particularly calcarious spar, quartz, agate, zeolite, chlorite, &c. When the imbedded minerals are detached, it is porous, like lava.