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These little ocean critters belong to a family of phytoplankton whose main talent lies in converting dissolved carbon into calcite.—Ben Mather, Space.com, 7 Feb. 2026 For context, Limestone, which also contains calcite, has a 2 or 3 hardness rating.—Barbara Bellesi Zito, Southern Living, 2 Jan. 2026 This process rapidly generates carbonic acid, which, when introduced to calcium, triggers the formation of solid calcite crystals.—Mrigakshi Dixit, Interesting Engineering, 30 Dec. 2025 Crafted from calcite, the artifacts were discovered across various archaeological sites, including the famed tomb of the Pharaoh Tutankhamun.—Andrew Paul, Popular Science, 12 Nov. 2025 See All Example Sentences for calcite