AMPHIBOLE n.
so 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 common varieties are tremolite, actinolite, asbestus, edenite, hornblende (the last name being also used as a general t…
ANGLE n.
ne another on the surface of a globe or sphere. -- Visual angle, the angle formed by two rays of light, or two straight lines drawn from the extreme points of an object to the center of the eye. -- For Angles of commutation, draught, incidence, reflection, refraction, position, repose, fraction, see Commutation, Drau…