Cape Blue

Cape Blue is the historical commercial name for crocidolite asbestos mined in the Northern Cape Province of South Africa. It is a blue, fibrous form of the mineral riebeckite, considered the most hazardous variety of commercially used asbestos. The name distinguished South African crocidolite from "West Australian Blue" crocidolite in international trade.

Origin

The term entered industrial use in the late 19th and early 20th centuries after crocidolite was first mined commercially in the Cape Province (now Northern Cape) of South Africa beginning in the 1890s. South Africa was the world's dominant supplier of crocidolite for most of the 20th century, with mines at Koegas, Pomfret, Prieska, and Kuruman shipping fiber globally under the "Cape Blue" trade designation.

Significance in Asbestos Context

For patients, identifying exposure to Cape Blue can be pivotal because crocidolite is the asbestos fiber most strongly linked to mesothelioma, with shorter latency and higher potency than chrysotile or amosite. Many products that caused mesothelioma — including certain insulation, cigarette filters (Kent Micronite), gas mask filters, sprayed coatings, and asbestos-cement pipes — used South African crocidolite specifically. If your work history, military service, or product exposure can be tied to items containing Cape Blue, this often strengthens the scientific basis for causation. Fiber analysis from lung tissue or pleural plaques can sometimes confirm crocidolite, and trade records may trace the fiber back to specific South African mines and their corporate owners (notably Cape Asbestos Company and later Cape plc).

Example Sentence

The industrial hygienist testified that the pipe insulation used at the refinery during the 1960s contained Cape Blue crocidolite imported from the Koegas mine.

Related Terms

Crocidolite, Riebeckite, Amphibole, Wittenoom, Fiber Burden Analysis, Cape Asbestos Company

Notes

• If you worked with imported insulation, gas masks, or asbestos-cement products before 1980, ask your legal team to investigate whether Cape Blue crocidolite was used in those products. Shipping and procurement records often survive.
• Request that any lung tissue or lymph node fiber analysis specifically report crocidolite counts, not just total asbestos; crocidolite findings carry significant evidentiary weight for mesothelioma claims.
• Preserve any product packaging, military specifications, purchase orders, or employer safety data sheets that reference "blue asbestos," "crocidolite," or South African origin.
• Cape Blue exposure is particularly relevant in cases involving Kent Micronite cigarette filters (1952–1956), Navy ship insulation, and certain European and South African industrial settings.