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Calthemite
Secondary calcium carbonate deposit growing under man-made structures / From Wikipedia, the free encyclopedia
Calthemite is a secondary deposit, derived from concrete, lime, mortar or other calcareous material outside the cave environment.[1][2] Calthemites grow on or under man-made structures and mimic the shapes and forms of cave speleothems, such as stalactites, stalagmites, flowstone etc.[3] Calthemite is derived from the Latin calx (genitive calcis) "lime" + Latin < Greek théma, "deposit" meaning ‘something laid down’, (also Mediaeval Latin thema, "deposit") and the Latin –ita < Greek -itēs – used as a suffix indicating a mineral or rock.[1][2] The term "speleothem",[4] due to its definition (spēlaion "cave" + théma "deposit" in ancient Greek) can only be used to describe secondary deposits in caves and does not include secondary deposits outside the cave environment.[3]
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