Calcareous
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Calcareous is an adjective meaning "mostly or partly composed of calcium carbonate", in other words, containing lime or being chalky. The term is used in a wide variety of scientific disciplines.
Calcareous sandstone in Seven Sisters Country Park, England
Calcareous mine in Perm Krai, Russia
Colloniidae
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Colloniidae is a family of small sea snails with calcareous opercula, marine gastropod mollusks in the clade Vetigastropoda.
Homalopoma sanguineum 01
Naturalis Biodiversity Center RMNH.MOL.144520 Leptothyra laeta Colloniidae Mollusc shell