Rare phosgenite typically shows pale colors. This material is difficult to cut and too soft for jewelry wear. However, its strong yellowish fluorescence appeals to collectors of unusual gemstones.
Lapidaries can cut massive phosgenite into interesting cabochons of various colors, up to the size of the rough (several inches). However, faceted pieces are more rarely encountered, not simply due to the material’s scarcity. Phosgenites can have directions of variable (and low) hardness (2-3) and distinct to good cleavage. Although this gem can have an adamantine, diamond-like luster, it’s also difficult to polish. If you take into account its flexible and sectile properties, it just doesn’t make a practical jewelry stone.
Identifying Characteristics
While phosgenite usually occurs colorless or in soft shades of yellow, gray, brown, pink, or green, it has a strong yellowish fluorescence under both ultraviolet light (UV) and X-rays. This fluorescence and its relatively high specific gravity (SG) of 6.13 help to distinguish it from stones of similar range and hardness. In fact, phosgenite has a much greater density than two more popular gems with a similar range of colors and hardness: amber (1.08) and mellite (1.64).
However, two other rarely faceted collector’s gemstones have a comparable range of colors, hardness, and SG. Like phosgenite, anglesite and cerussite can be colorless as well as white, grayish, yellowish, or greenish. Their fluorescence under UV light can also appear yellowish. Furthermore, these minerals can crystalize in close association.
Phosgenite with cerussite, Thorikos Bay slag locality, Thorikos area, Laurium District slag localities, Laurium District, Attica Prefecture, Greece. Photo by Didier Descouens. Licensed under CC By-SA 4.0. (The transparent prismatic crystals are phosgenites; the acicular, “needle-like” crystals are cerussites;).
Comparison of Selected Physical and Optical Properties of Anglesite, Cerussite, and Phosgenite
Scientists have synthesized phosgenite for various purposes for centuries. In the February 2014 newsletter of the British Micromount Society, Steve Plant describes various manufacturing methods, from the time of the Ancient Egyptians (who used synthetic phosgenite for makeup) through 19th and early 20th century procedures to current techniques. Although lab-created crystals do exist, there is no known jewelry use for this material.
Enhancements
None known.
Sources
Monteponi, Sardinia, Italy produces fine, yellow-brown crystals up to 5 inches across, some with facetable areas.
Other notable sources include the following:
United Kingdom: Matlock and Cromford, Derbyshire, England (type locality).
United States: Arizona; California; Colorado; Massachusetts; New Mexico.
Rare faceted specimens almost always weigh less than 2 carats. Typically from Sardinia, these gems usually have a yellowish brown color. However, a few larger stones exist, some up to about 10 carats.
Phosgenites contain lead. When cutting this material, avoid ingesting or inhaling particles and wash your hands. For more information, consult our articles on lapidary health hazards and safety tips and toxic and radioactive gems. Since the material is so soft, jewelry use isn’t recommended.