The endmember hornblende tschermakite (☐Ca2(Mg3Al2)(Si6Al2)O22(OH)2) is a calcium rich monoclinic amphibole mineral. It is frequently synthesized along with its ternary solid solution series members tremolite and cummingtonite so that the thermodynamic properties of its assemblage can be applied to solving other solid solution series from a vari...
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http://en.wikipedia.org/wiki/Tschermakite
(from the article `pyroxene`) ...of Li+ and Al3+ for 2 Mg2+ yields spodumene. The substitution of Al3+ for Mg2+ and Al3+ for Si4+ yields the ideal tschermakite component ... ...(OH)2. The four end-members and the cation content of their respective compositions are as follows: hornblende, Ca2(Mg4Al) (Si7Al); tschermakite, ... [2 relat...
Found on
http://www.britannica.com/eb/a-z/t/87
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