Bentonite vs dolomite explained: a swelling montmorillonite clay versus an acid-neutralising calcium-magnesium carbonate. Side-by-side comparison, when to choose each in industry and agriculture, why they're complementary not interchangeable, and how they can be used together.
Introduction
Bentonite and dolomite are both mined mineral products sold as powders and granules, and both are used in agriculture and industry — which is exactly why buyers sometimes confuse them. In reality they are completely different minerals with different chemistry and different jobs. This guide lays out the differences clearly so you order the right one.
They Are Different Minerals
- Bentonite is a clay, composed mainly of montmorillonite (an aluminium silicate). Its defining trait is that it swells and absorbs water, forming viscous, sticky, binding suspensions.
- Dolomite is a calcium-magnesium carbonate (CaMg(CO₃)₂). Its defining trait is that it neutralises acidity and supplies calcium and magnesium. It does not swell.
That fundamental difference — a swelling silicate clay versus an acid-neutralising carbonate — drives everything else.
Side-by-Side Comparison
| Property | Bentonite | Dolomite |
|---|---|---|
| Mineral type | Clay (montmorillonite) | Carbonate (CaMg(CO₃)₂) |
