The Collaborative International Dictionary of English v.0.48:

Quartzose \Quartz"ose`\, a. [Cf. F. quartzeux, G. quarzig.]
   (Min.)
   Containing, or resembling, quartz; partaking of the nature or
   qualities of quartz.
   [1913 Webster]

WordNet (r) 3.0 (2006):

quartzose
    adj 1: relating to or made of quartz