Concept:Quartz is a hard mineral that lacks cleavage, even though it shows other noticeable physical features.Explanation:Cleavage is the ability of some minerals to break along smooth, flat planes.Quartz does not break this way; it usually fractures with a curved, shell-like surface.Quartz is commonly shiny, glass-like, and can appear granular in some rock forms.Therefore, having cleavage is not a characteristic of quartz.Answer:A. having cleavage