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They are crocidolite - often referred to as blue asbestos; amosite - often called brown asbestos; and chrysotile - white asbestos.

That’s one of six minerals – along with chrysotile, actinolite, amosite, anthophyllite and crocidolite – that occur in nature as crystalline fibers known as asbestos, a recognized carcinogen.

The manufacturer produced gaskets containing a form of asbestos that is considered far less dangerous than the crocidolite used in pipe insulation, but plaintiff lawyers targeted Garlock with escalating demands for payment as companies that produced more dangerous types of asbestos have gone bankrupt.

The analysis showed that the majority of the masks did contain asbestos, often the more dangerous crocidolite, or blue asbestos.

Crocidolite, kro-sid′o-līt, n. a mineral consisting mainly of silicate of iron, in asbestos-like fibres.