Tutton's Salt
Tutton's salts are a family of salts with the formula M2M'(SO4)2(H2O)6 (sulfates) or M2M'(SeO4)2(H2O)6 (selenates). These materials are double salts, which means that they contain two different cations, M+ and M'2+ crystallized in the same regular ionic lattice.
Read more about Tutton's Salt: Examples and Related Compounds, History
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—John Berger (b. 1926)