2023年12月17日 · Natural slag glass is a by-product of ancient volcanic eruptions. As the molten lava cools and solidifies under specific conditions, it forms a unique kind of glass embedded with swirls and patterns reminiscent of marble. This glass is not to be confused with man-made slag, produced as a residue during the metal extraction process.

2020年8月18日 · Adding to the beauty of slag glass – also known as malachite glass, marble glass, and mosaic glass – is its rich history that reflects the ingenuity of turn-of-the-century glassmakers. This article strolls through this history and highlights some of its most popular forms for those who want to surround themselves with exceptional slag glass ...

Slag glass is a type of opaque pressed glass that includes colorful streaks that create a marbled effect. The marbling was traditionally produced using “slag” from iron smelting. Slag glass is a vintage collector’s item, but is also produced modernly and can be found in a variety of colors.

2023年9月27日 · Slag glass is the term used to describe a colored, pressed opaque glass made using ‘slag’ leftover from the iron smelting process. Slag Glass rock varieties come in different hues (hue is another word for “color”) and patterns.

2023年9月14日 · Is Slag Glass Natural? Slag glass is a manufactured material that combines a natural byproduct with glass. Manufacturers experimented with different methods to achieve this malachite-like look. For example, manufacturers also made slag glass by …

2021年8月4日 · Slag glass is an unfortunate name for glass, often beautifully coloured, that is a by-product of metal ore smelting processes. Metal furnace slag can range from glassy to dull and stony in appearance and, when scratched, can range from hard to chalky.

2024年8月12日 · Slag glass is a type of pressed glass renowned for its unique, often marbled or streaky appearance. As iron ore is smelted, the process results in the creation of a glass-like byproduct referred to as slag.

"Slag glass" is a collectors' name for opaque pressed glass with coloured streaks, usually white and/or cream streaks like this brown bugle made by George Davidson's in the North East of England in the 1890's. The name derives from the belief that these colours were achieved by adding slag from iron smelting works to the glass.

Check out our natural slag glass selection for the very best in unique or custom, handmade pieces from our rocks & geodes shops.

For years, a light to dark blue or yellowish to green veined glass slag has been tradet with astonishing persistence as "blue obsidian". Initially it was sold as "antique glass", but soon it underwent a misleading metamorphosis into the alleged natural product obsidian.