Formula :
Cu2Mg2[(OH)6/CO3] * 2 H2O
System: monoclinic Hardness:3-3½ Rarity:rare
Strunz id:5/E.07-10 -
5 : Nitrates, Carbonates & Borates
Name origin: Honors Dr. Eugene Callaghan (1904–1990), Director of the New Mexico Bureau of
Mines, Socorro, New Mexico, USA, for his work on magnesite deposits.
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