al·lo·phane 
(ălə-fān′)
(ălə-fān′)n.
An amorphous, translucent, variously colored mineral, essentially hydrous aluminum silicate.
[From Greek allophanēs, appearing otherwise : allos, other; see ALLO- + phainesthai, phan-, to appear, passive of phainein, to show; see bhā-1 in the Appendix of Indo-European roots.]