allophane

noun
al·​lo·​phane | \ ˈa-lə-ˌfān How to pronounce allophane (audio) \

Definition of allophane

: an amorphous translucent mineral of various colors often occurring in incrustations or stalactite forms and consisting of a hydrous aluminum silicate

First Known Use of allophane

1817, in the meaning defined above

History and Etymology for allophane

Greek allophanēs appearing otherwise, from all- + phainesthai to appear, middle voice of phainein to show — more at fancy

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The first known use of allophane was in 1817

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Britannica.com: Encyclopedia article about allophane

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