si 8の例文

例文

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1. There is also a rare amphibole called holmquistite, chemical formula Li 2 Mg 3 Al 2 Si 8 O 22 ( OH ) 2, which occurs only in lithium-rich continental rocks.
2. An extreme example is ekanite, ( Ca, Fe, Pb ) 2 ( Th, U ) Si 8 O 20, which almost never occurs in nonmetamict form due to thorium being an essential part of its chemical composition.
3. The backbone of the amphiboles is the [ Si 8 O 22 ] 12 "; it is balanced by cations in three possible positions, although the third position is not always used, and one element can occupy both remaining ones.
4. "' Anthophyllite "'is an amphibole mineral :  & Mg 2 Mg 5 Si 8 O 22 ( OH ) 2 (  & is for a vacancy, a point defect in the crystal structure ), magnesium iron polymorphic with cummingtonite.
5. These minerals are found in high-grade metamorphic banded iron formation and form a compositional series between Mn 2 Mg 5 Si 8 O 22 ( OH ) 2 ( tirodite ) and Mn 2 Fe 5 Si 8 O 22 ( OH ) 2 ( dannemorite ).