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Featured Asbestos – Crocidolite

Crocidolite - blue asbestos

When most people imagine what asbestos looks like, they often think of a white fibrous mass. However, asbestos varieties come in different shades such as brown and blue. The blue asbestos is called Crocidolite.

For my fellow geology enthusiasts, Crocidolite is actually the name of the fibrous form of the blue mineral known as Riebeckite. The high sodium content in the mineral gives it the iconic blue color. Crocidolite and Riebeckite both belong to the amphibole asbestos group which also is the group of 5 of the 6 regulated asbestos minerals.

Amphibole asbestos minerals such as Crocidolite were often used in thermal system insulation in conjunction with Chrysotile due to their higher temperature resistance and durability. Crocidolite, as with other amphiboles, are considered to be more harmful than Chrysotile due to their needle-like shape and higher durability and more linked to mesothelioma.

While Crocidolite is mostly used in thermal system insulation such as magnesium block, it was also previously used in cigarette filters. In the 1950s the Lorillard Tobacco Company produced Kent cigarettes with their new “micronite” filter. This filter was marketed as being safer than other cigarettes because it filtered out toxins and particles. This marketing was successful at time due to rising awareness of the relationship between smoking and lung cancer. The cigarette company even used letters from physicians promoting the safeness of the filter.  Many workers at the factory who produced the filters succumbed to mesothelioma.

Remember that asbestos isn’t always white and the only way to detect its presence is with a laboratory test.

Ian Cull

Ian Cull is a nationally recognized expert in the field of indoor air quality. He is the Chief Science Officer of Indoor Science, a company he started in 2004. He speaks around the world on air quality topics and is a training provider of the Indoor Air Quality Association. Mr. Cull is a Licensed Professional Engineer (PE) and Certified Industrial Hygienist (CIH). His degree is in Environmental Engineering from the University of Illinois - Urbana Champaign. Mr. Cull has developed 50 air quality related courses for the IAQA University and is the author of the book, “Fundamentals of Mold Remediation”. In his words… “Besides being passionate about indoor air quality, I enjoy cycling, music, the Chicago Bulls, and having fun with my three kids.”