Volcanic Tuff
![](/assets/images/timthumb/timthumb.php?1717521099&w=800&h=&src=/assets/images/collection/146/gr780.jpg)
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Description:
A sample of buff-gray volcanic tuff rock with tiny black crystals, possibly biotite mica.
- Rock type: Igneous
- Collection: Geology Collection
- Object Name: Igneous Rock
- Object Id: GR780
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