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Allophane
An example of the element Silicon

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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
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