A short explanation Malachite is a green copper carbonate mineral which occurs naturally and has concentric layers. It polishes to a high gloss and is used for ornaments.
Malachite glass is intended to look like malachite, or more generally, to look like marble.
The term was used by many glassworks in the 19th century, each with their own variation on the theme. This was green with clear or white streaks and a gold enamelled pattern, and was continued until 1910. They have been continuously produced since that time, with only a short break during the second world war. Originally offered in jade green and lapis blue, they have since been made in a wide range of colours. Some writers have referred to the quality of handwork on the originals as an indicator.