saussurite

[ saw-suh-rahyt ]

/ ˈsɔ səˌraɪt /

a mineral aggregate of albite, zoisite, and other calcium aluminum silicates, formed by alteration of plagioclase feldspars in igneous rocks.

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1805–15; named after H. B. de Saussure (1740–99), Swiss geologist and physicist; see -ite¹

saus·su·rit·ic

[saw-suh-rit-ik] /ˌsɔ səˈrɪt ɪk/, adjective

Saussurite, saw-sū′rīt, n. a fine-grained compact mineral, of grayish colour.
Chambers's Twentieth Century Dictionary (part 4 of 4: S-Z and supplements)|Various
Equally characteristic of the gabbros is the alteration of the felspars to cloudy, semi-opaque masses of saussurite.
Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 4|Various