Linked from
The 50 pages that link to Quartz, each with the reason it gives.
Silicate mineralBroader topic: Quartz is a framework silicate made entirely of silicon and oxygen.
Mohs scaleBroader topic: It is a common reference point in the scale’s harder range.
Silicon dioxideBroader topic: It is the best-known natural crystalline form of silicon dioxide.
SandBroader topic: Its durability makes quartz grains common in sand deposits.
GreisenBroader topic: Quartz commonly remains abundant as feldspar is altered during greisenization.