allophane

[al-uh-feyn]

al·lo·phane

[al-uh-feyn]
noun
a clay mineral, an amorphous hydrous silicate of aluminum, occurring in blue, green, or yellow, resinous to earthy masses.

Origin:
1835–45; < Greek allophanḗs, equivalent to allo- allo- + phan- (stem of phaínesthai to appear) + -ēs adj. suffix
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Allophane is always a great word to know.
So is bezoar. Does it mean:
a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison.
a gadget; dingus; thingumbob.
Collins
World English Dictionary
allophane (ˈæləˌfeɪn)
 
n
a variously coloured amorphous mineral consisting of hydrated aluminium silicate and occurring in cracks in some sedimentary rocks
 
[C19: from Greek allophanēs appearing differently, from allo- + phainesthai to appear]

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