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Latest comment: 11 years ago4 comments3 people in discussion
Why does wikipedia have to find the worst way of writing a chemical formula?
For example Grunerite Fe7Si8O22(OH)2 - it's composed of Si2O11(-6) so it's rather like Fe7(Si2O11*OH)2 (as well as Fe7(Si2O11/OH)2 or Fe7(Si2O11)2(OH)2, as just to note you can't find anything for (Si8O22) only Si4O11(-6).
RSXLV (talk) 09:10, 1 January 2011 (UTC)Reply
Inexpertly, many Amphiboles have the following general chemical composition: (MO)7Q8W, i.e. composed of Mafic (Fe,Mg,Ca) oxides, Quartz, and Water.66.235.38.214 (talk) 10:14, 12 October 2012 (UTC)Reply
For comparison to Biotite, the general Amphibole formula may be re-written: (MO Q)7QW. Basically, Biotite replaces Q → (K Al O2), and incorporates more than twice as much W. 66.235.38.214 (talk) 09:21, 20 October 2012 (UTC)Reply