A mineral was heated in a Bunsen flame until it had reached constant mass, and a colourless gas that caused lime water to turn milky was given off. The solid left behind was then cooled and added to aqueous hydrochloric acid. Strong effervescence was observed. What was the mineral?
- Aaragonite, $\text{CaCO}_3$
- Bartinite, $\text{MgCO}_3\cdot\text{Mg(OH)}_2\cdot3\text{H}_2\text{O}$
- Cbarytocalcite, $\text{BaCO}_3\cdot\text{CaCO}_3$
- Ddolomite, $\text{CaCO}_3\cdot\text{MgCO}_3$