Mineralogic Zones
Mudrock, a fine-grained sedimentary rock often containing aluminium-rich minerals, produces these minerals after being metamorphosed, from low to high grade:
- Chlorite zone: quartz, chlorite, muscovite, albite
- Biotite zone: quartz, muscovite, biotite, chlorite, albite
- Garnet zone: quartz, muscovite, biotite, garnet, Na plagioclase
- Staurolite zone: quartz, muscovite, biotite, garnet, staurolite, plagioclase
- Kyanite zone: quartz, muscovite, biotite, garnet, kyanite, plagioclase, +/- staurolite
- Silimanite zone: quartz, muscovite, biotite, garnet, sillimanite, plagioclase
Read more about this topic: Index Mineral
Famous quotes containing the word zones:
“The technological landscape of the present day has enfranchised its own electorates—the inhabitants of marketing zones in the consumer goods society, television audiences and news magazine readerships... vote with money at the cash counter rather than with the ballot paper at the polling booth.”
—J.G. (James Graham)