general/gemstones

Yellowish or greenish green mineral

Cyclosilicate mineral

Process to enhance a gemstone's optical properties

Nodule-like rock, that is formed within rhyolitic volcanic ash layers

Cyclosilicate mineral

Rare gemstone

Artificial glass made from volcanic ash

Green natural glass possibly formed by a meteorite impact

Single chain manganese inosilicate (MnSiO₃)

Type of glass

Green gem-quality mineral

Aluminosilicate mineral

Sodium-rich plagioclase feldspar mineral

Zinc-iron sulfide mineral