GeologyRocks

if you are talking about glass like in your house for windows, then yes.  That glass is basically melted and reformed quartz (SiO2).  But if you're talking about different mineral types that may be labeled as "glass," they can have either high or low silica content.

Fantastic, yes I meant common or garden house glass (windows, bottles, etc) as opposed to any technical description of a mineral.

 Thank you so much for bothering to answer such a mundane question, you have helped me immensely.