*Light Magnesium Carbonate* $MgCO_3$
Got you — this is the fluffy, super light white powder version.
# *1. Quick Facts*
**Property** **Detail**
**Other names** Magnesia Alba, Light Magnesia
**Look** Snow-white, fluffy, ultra-light powder
**Density** ~0.15 - 0.30 g/cm3. Much lighter than "Heavy" grade
**Solubility** Doesn’t dissolve in water. Reacts with acid + fizzes
**pH** Mildly alkaline ~9.5
# *2. Main Uses*
1. *Pharmaceuticals* - Antacid for heartburn, stomach ulcer. Neutralizes excess acid
2. *Food E504(ii)* - Anti-caking agent in table salt, baking powder, powdered drinks. Keeps powder flowing
3. *Cosmetics* - Face powder, dry shampoo, deodorant. Absorbs oil + sweat
4. *Rubber/Plastics* - Drying agent + filler. Makes rubber products stronger
5. *Fire Retardant* - Used in cables, fireproof