The best replacement for calcite is quartz.

The best alternatives to calcite are rated as following:
★★★★★  quartz
★★★★  dolomite
★★★★  aragonite
★★  gypsum
★★  halite
★  calcium carbonate
★  citrine
  soda ash

Your alternative for calcite is not listed? Suggest!
Speaking about calcite, one probably shouldn't forget about pyrite.

Other search terms related to calcite and their ratings are:
★★★★★ pyrite
★★★ chalcopyrite
★★ fluorite
★ amethyst
You have in mind a companion for calcite and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of calcite in all years. Click on graph for more.
calcite
quartz
dolomite