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Tectosiliates
3-D Framework Structure
Si/O = 1/2

Click on each image to see an enlarged view.

Orthoclase Feldspar  KAlSi3O8
orthoclase.JPG (32929 bytes)		 Plagioclase Feldspar
Albite NaAlSi3O8
Anorthite CaAl2Si3O8
plagioclase3.JPG (34149 bytes) plagioclase2.JPG (38648 bytes)
Rose Quartz SiO2
rosequartz.JPG (35987 bytes)
 Smoky Quartz SiO2
Milky Quartz SiO2
milkyquartz.JPG (32734 bytes)		 Rock Quartz SiO2
rockquartz.JPG (32788 bytes)
Amethyst Quartz SiO2 Flint SiO2
flint.JPG (34982 bytes)
Opal SiO2 - nH2O Chalcedony SiO2