Nomenclature
CAS number: 39409-82-0
Carbonic acid, magnesium salt (1:1), mixt. with magnesium hydroxide,
hydrate; Marinco C.
Description and references
Usually a basic carbonate, approx (MgCO3)4.Mg(OH)2.5H2O; approx mol
wt 485; contains 40-42% MgO. Prepn of various hydrates: Pond, Heneghan, US 3169826 (1965 to Merck &
Co.). Magnesium carbonate minerals include magnesite and lansfordite.
Properties
White, odorless, bulky powder or light friable
masses; at about 700° is converted into MgO. Sol in about 3300 parts
CO2-free water; more sol in water contg CO2;
sol in dil acids with effervescence. Insol in alcohol. Imparts slight
alkaline reaction to water.Derivative
Hydrotalcite.
Nomenclature
CAS number: 12304-65-3
Altacite (HMR); Hi-Ti (Kyowa); Nacid (Shionogi); Talcid (Bayer).
Description and references
an aluminum magnesium hydroxide carbonate hydrate
of the general formula Al2O3.6MgO.CO2.12H2O. Prepn: Kumuru et al., US 3539306 (1970 to Kyowa).
Caution
Potential symptoms of overexposure
to magnesite are irritation of eyes, skin, respiratory system; cough.
See NIOSH Pocket Guide to Chemical
Hazards (DHHS/NIOSH 97-140, 1997) p 188.Use
Fireproofing, heat insulating; preparing effervescent
magnesium citrate; clarifying liqs by filtration; in tooth and face
powders, in polishing compds; manuf mineral waters, pigments, paper;
filler for rubber.
Therapeutic Category
Magnesium carbonate hydroxide as antacid, cathartic; hydrotalcite
as antacid.
Therapeutic Category (Veterinary)
Laxative.
Keywords
Antacid; Laxative/Cathartic