- /am"euh suyt'/, n. Mineral.an asbestine variety of anthophyllite, rich in iron, formerly used as a heat-resistant material.[1915-20; A(sbestos) M(ine) o(f) S(outh Africa) + -ITE1]
* * *Variety of the silicate mineral cummingtonite, which is a source of asbestos.Cummingtonite is an amphibole mineral, an iron and magnesium silicate that occurs in metamorphic rocks in the form of long needlelike, fibrous crystals.
* * *a variety of the silicate mineral cummingtonite, which is a source of asbestos (see cummingtonite).
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