Quartz type is a term used to describe a variety of minerals that are composed of silicon dioxide. ONYX, a four letter word, is a type of quartz that is usually black or dark green in color and has a waxy luster. JASPER, a six letter word, is an opaque variety of quartz that can be found in a range of colors including red, yellow, and brown. AGATE, a five letter word, is a type of quartz that is characterized by its banded patterns and is usually found in shades of white, gray, and pink.