Linked from
The 50 pages that link to Calcite, each with the reason it gives.
Mohs scaleBroader topic: Its position shows the scale’s progression from soft minerals.
CarbonateBroader topic: It is a familiar mineral built from calcium and carbonate ions.
EggshellBroader topic: Most of the mineral in typical bird eggshells is calcite.
CementationBroader topic: Calcite is a frequent cement that fills pores and joins grains.
Calcium cycleBroader topic: It is a major calcium reservoir in limestone and marine sediments.