hydromagnesite

== English == === Etymology === From hydro- +‎ magnesite. === Noun === hydromagnesite (plural hydromagnesites) (mineralogy) A hydrated magnesium carbonate mineral with the chemical formula Mg5(CO3)4(OH)2.4H2O, used as a fire retardant. === Further reading === David Barthelmy (1997–2026), “Hydromagnesite”, in Webmineral Mineralogy Database. “hydromagnesite”, in Mindat.org‎[1], Hudson Institute of Mineralogy, 2000–2026.