Geology you can hold in your hand.
Eocene-aged hypabyssal andesite with anorthosite xenolith dated to ~1.4 Ga. Possible Grenvillian-age crust under Cristo Rey.
A slab of differentially-weathered Archean gneiss from the Spanish Peaks region of the Gallatin Range, Montana. Part of the Wyoming Craton.
Two soft mineral specimens.
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