Rocks - local

Local rocks donated by Robert B. Coyle of Athol
Quartz crystals with limonite stain - green fluorite from Westmoreland, NH.
Feldspar smoky quartz black tourmaline in pegmatite (an igneous rock) - probably local
Scoria - a dark, scoriaceous igneous rock

Approximate era: 
don't know
Donated by: 
Robert B. Coyle of Athol