Volcanic Andesite Slab
Montana Pyroclastic Rock
Vesicular Basalt
Puddingstone
Rare Volcanic Beccia
Volcanic Breccia
Porphyritic Basalt
Fine Grained Sandstone
Arkosic Sandstone
Elkhorn Mountains Volcanics — Cut & Polished Specimen (Stand Included)
Quartz Vein
Intrusive/Extrusive Volcanic
