Allophane : (Al2O3)(SiO2)1.3-2·2.5-3H2O
6mm x 6mm x 3mm
Photo added to mindat.org
“Bluish, vitreous botryoidal allophane from Alpe Machetto mine
Visually identified
Specimen and Photo: Bruno Marello”
Bruno Marello - 15th July 2016
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