Show sample as: 72-frame QuickTime VR or 360-frame QuickTime movie loop.    My periodic table poster is now available! Allophane. Description from the source: Allophane (amorphous hydrous aluminum silicate), Steyermark, Tyrol, Austria. An amorphous mineral on very delicate matrix. 3x1,8x1 cm; 3 g. Source: Simone Citon Contributor: John Gray Acquired: 10 January, 2009 Text Updated: 10 January, 2009 Price: Trade Size: 1.2" Composition: (Al2O3)(SiO2)1.3-2+2.5-3H2O