Aragonite group
Group of minerals belonging to your carbonate group that are isomorphous with one another. Each of them crystallize in the crystal that is orthorhombic, display good cleavage (although not just like the people of this calcite group), have weak double refraction in transparent specimens, and commonly intergrow in three individuals developing six sided trillings. Well-known users include Aragonite, Cerussite, and Strontianite.
