O
Si
Ca
Al
Ball and Stick
Stick
Spacefill
Polyhedral
https://virtual-museum.soils.wisc.edu/wp-content/uploads/sites/7/2016/08/margarite_poly1.txt
https://virtual-museum.soils.wisc.edu/wp-content/uploads/sites/7/2016/08/margarite_poly2.txt
https://virtual-museum.soils.wisc.edu/wp-content/uploads/sites/7/2016/08/margarite_poly3.txt
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Margarite
Margarite is a brittle mica; that is, it has 2 negative charges per half unit cell. These are balanced by the presence of calcium ions in the interlayer. The interlayer calcium ions are dehydrated, allowing for a close fit between the 2:1 sheets.
Highlighting Features
Plane of O atoms Plane of Si atoms Plane of Ca atoms Plane of Al atoms All atomsGuggenheim, S., and S.W. Bailey. 1975. Refinement of the margarite structure in subgroup symmetry. American Mineralogist. 60:1023-1029.