websterite

plural websterites

1. countableuncountableA hydrous aluminium sulfate mineral with formula Al₂SO₄(OH)₄·7(H₂O).

   On Websterite found in the Plastic Clay of Auteuil, near Paris [article title]

   1828 August 28, Alexandre Brongniart, edited by Richard Taylor and Richard Phillips, The Philosophical Magazine, volume IV, London: Richard Taylor, page 81

   2 more examples

   Fig. 6 is the interesting spectrum of the bright blue compound of alumina. These three bands, although generally faint, are narrow and well defined, the blue and green spaces being invariably clear. Websterite and cryolite show this spectrum to great advantage.

   1873, Charles Horner, “On the Spectra of Some Cobalt Compounds in Blowpipe Chemistry”, in Chemical News and Journal of Industrial Science, page 242

   Among some specimens of eruptive rocks obtained from Gallatin, Jefferson and Madison Counties, Montana, Merrill finds basalts, andesites, lamprophyres, syenites, porphyrites, wehrlites, harzburgites and websterites, some of which possess peculiar characteristics.

   1896 February 28, “Eruptive Rocks from Montana”, in The American Naturalist, volume XXX, number III, page 128

   Synonyms: alley stone, aluminite