The natural mineral form is known as 'nahcolite'.

The anhydrous mineral form of sodium carbonate is quite rare and called natrite.

Shcherbinaite, a naturally-occurring mineral form of vanadium pentoxide, is named for him.

Galena is the natural mineral form of lead(II) sulfide.

Iodyrite or iodargyrite is a natural mineral form of silver iodide.

Galena,the natural mineral form of lead sulfide was the one pulled out.

The actual formula, specific mineral forms, and amounts of each of the materials used in manufacturing is secret.

For example, beryl, which is colorless in its pure mineral form, becomes emerald with chromium impurities.

The solid mineral form of magnesium hydroxide is known as brucite.

Plumbago was commonly used in its massive mineral form.