Adjective
Partaking of the nature of calcite or calcium carbonate; consisting of, or containing, calcium carbonate or carbonate of lime.
Source: Webster's dictionaryAlthough their shell may be so fine as to be transparent, it is nevertheless calcareous ; citation their shells are bilaterally symmetric and can vary widely in shape: coiled, needle-like, triangular, globulous. Source: Internet
At the end of this eruptive phase, an island circled by reefs was formed, its marine vestiges are evident in a calcareous layer in the area of Lameiros, in São Vicente (which was later explored for calcium oxide production). Source: Internet
Chaffey (p.9) Geological map of Dorset Dorset has a number of limestone ridges which are mostly covered in either arable fields or calcareous grassland supporting sheep. Source: Internet
Classes Sponges were traditionally distributed in three classes: calcareous sponges (Calcarea), glass sponges (Hexactinellida) and demosponges (Demospongiae). Source: Internet
However, almost all species of shelled mollusks are capable of producing pearls (technically "calcareous concretions") of lesser shine or less spherical shape. Source: Internet
C. sativus prefers friable, loose, low-density, well-watered, and well-drained clay- calcareous soils with high organic content. Source: Internet