The carbonate that is produced, magnesite, is a commercial product one could look up.
Molded of magnesite cement, they are lighted by hidden electric bulbs.
magnesite and other carbonates are common accessories.
Privatization efforts were continuing in the magnesite and refractories industries.
British Dictionary definitions for magnesite
a white, colourless, or lightly tinted mineral consisting of naturally occurring magnesium carbonate in hexagonal crystalline form: a source of magnesium and also used in the manufacture of refractory bricks. Formula: MgCO3