Earlandite, [Ca3(C6H5O7)2(H2O)2]·2H2O, is the mineral form of calcium citrate tetrahydrate.

It was first reported in 1936 and named after the English microscopist and oceanographer Arthur Earland FRSE.

Earlandite occurs as warty fine-grained nodules ca.

1 mm in size in bottom sediments of the Weddell Sea, off Antarctica.

[4] Its crystal symmetry was first assigned as orthorhombic, then as monoclinic, and finally as triclinic.