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Alunite.
An example of the element Potassium

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Alunite.
Description from the source:
Alunite (KAl3(SO4)2(OH)6 trig.), La Tolfa, Civitavecchia, Lazio, Italy. Small crystal clusters on the same massive material from a classic italian locale. 3,8x2,2x1,5; 22 g.
Source: Simone Citon
Contributor: John Gray
Acquired: 26 September, 2008
Text Updated: 28 September, 2008
Price: Trade
Size: 1.5"
Composition: KAl3(SO4)2(OH)6
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