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The dust she’s referring to is toxic amphibole asbestos dust that settled into people’s lungs upon exposure, causing deadly diseases such as lung cancer, asbestosis and mesothelioma.

A bright green variety of amphibole occurring usually in fibrous or columnar masses.

HORNBLENDE, an important member of the amphibole group of rock-forming minerals.

In these the minerals have a parallel arrangement, the felspars are often broken down by pressure into a mosaic of irregular grains, while greenish fibrous or bladed amphibole takes the place of pyroxene and olivine.

The asbestos formerly used in the arts was generally a fibrous form of some kind of amphibole, like tremolite, or anthophyllite, though occasionally perhaps a pyroxene.