Changes

Glass is an inorganic product of fusion that has cooled to a rigid state without crystallizing.  According to the Center for Glass Research at the New York State College of Ceramics at Alfred University:<ref>http://cgr.alfred.edu/facts.html</ref>

'''Glass''' is an inorganic product of fusion that has cooled to a rigid state without crystallizing.  According to the Center for Glass Research at the New York State College of Ceramics at Alfred University:<ref>http://cgr.alfred.edu/facts.html</ref>

*Glass is typically hard and brittle and has a [[conchoidal]] fracture.

*Glass is typically hard and brittle and has a [[conchoidal]] fracture.

*A glass may be colorless or colored. It is usually transparent, but may be made translucent or opaque.

*A glass may be colorless or colored. It is usually transparent, but may be made translucent or opaque.