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Mica sheet
An example of the element Potassium

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Mica sheet.
This is a sheet of mica, a papery thin mineral that was often used as an electrical insulator. The term mica refers to a range of specific minerals and I don't know which one this is exactly, so the composition is just a guess.
Source: Mark Peterson
Contributor: Mark Peterson
Acquired: 13 January, 2010
Text Updated: 13 January, 2010
Price: Donated
Size: 3"
Composition: (KLi2Al(Al,Si)3O10(F,OH)2
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