Note:  Do not rely on this information. It is very old.


Augite, from the Greek, auge, lustre, is the name of a silicate of calcium, magnesium, aluminium, and iron, closely related chemically to hornblende. It crystallises in the oblique system, is greenish black and sub-resinous, and is an essential mineral in basalts and diabases, being apparently formed by more rapid cooling than hornblende.