Earlandite
Natural calcium citrate — first reported in 1936 and named for English oceanographer Arthur Earland.
Intro adapted from Wikipedia (CC BY-SA).
Earlandite is an IMA-recognized mineral species in the organic mineral class, with the chemical formula Ca₃(C₆H₅O₇)₂·4H₂O.
It crystallizes in the triclinic crystal system (space group P-1).
Key properties: specific gravity 1.8–1.95; optically biaxial.
IMA symbol Ear, grandfathered status — known before the IMA’s founding, named in 1936.
Found in unconsolidated ocean floor sediment at 2580 m depth.
It is found associated with Quartz.
The mineral was named to honor Arthur Earland (1866–1958), English oceanographer.
Index entry. This entry combines official IMA/RRUFF species data with published physical-property data and a Wikipedia introduction — a full written entry hasn’t been published yet.
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