Silicic Rocks

Silicic Rocks

1. Light in colour

   • Except Obsidian
     • Which is black

2. Light in density

3. High in silicon context

4. High in Quartz

   • 20%

5. High in Feldspar

   • Plagioclase
     • 25%
   • Orthoclase
     • 40%

6. Medium amount of Mica

   • 15%

7. NO Mafic minerals

   • 0%

8. Intrusive

   • Granite
     • Course grained
   • Micro-Granite
     • Medium grained

9. Extrusive

   • Rhyolite
     • Fine grained
   • Pumice
     • Glassy
   • Obsidian
     • Glassy

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