Which asbestos type is the most common in the United States and is commonly referred to as blue asbestos?

• A. Chrysotile
• B. Amosite
• C. Tremolite
• D. Crocidolite

Answer: (D)

Asbestos comes in several mineral forms that differ in fiber structure and how the body handles them. In the United States, chrysotile, the white serpentine form, has historically made up the majority of asbestos used in construction and industrial products. Its fibers are curly and easier to work with, which helped it become the most commonly used type here.

Blue asbestos is crocidolite, an amphibole form with straight, needle-like fibers that are more durable and tend to persist longer in lung tissue, making them particularly hazardous. While crocidolite is indeed highly dangerous, it was not the principal asbestos type used in the U.S.; chrysotile was.

All asbestos forms pose health risks when fibers are inhaled, but the hazardous profile and historical prevalence differ, which is why chrysotile is described as the most common in the U.S., while blue asbestos refers to crocidolite.