AMPHIBOLE n.
A common mineral embracing many varieties varying in color and in composition. It occurs in monoclinic crystals; also massive, generally with fibrous or columnar structure. The color varies from white to gray, green, brown, and black. It is a silicate of magnesium and calcium, with usually aluminium and iron. Some comm…
AMYGDALOID n.
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.
ANGLE n.
e for catching fish, consisting of a line, hook, and bait, with or without a rod. Give me mine angle: we 'll to the river there. Shak. A fisher next his trembling angle bears. Pope. Acute angle, one less than a right angle, or less than 90º. -- Adjacent or Contiguous angles, such as have one leg common to both angles.…