pyrophyllite
/ˌpʌɪrə(ʊ)ˈfɪlʌɪt/(also pyrophilite, pyrophillite)
noun
An aluminosilicate mineral resembling talc, occurring as white or pale-coloured foliated masses which exfoliate when heated.
- Pyrophyllite is an aluminium hydroxide and silicate, formula Al2Si4O10(OH)2, with a phyllosilicate structure. Crystal system: monoclinic..
Origin
Mid 19th century; earliest use found in Edinburgh New Philosophical Journal. From pyro- + ancient Greek ϕύλλον leaf + -ite, after German Pyrophyllit, so called on account of its exfoliation when heated.
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