I'm a sucker for a good rock shop so here's a list combined with my favorite Witchy shops
Map
My favorite all around Witchy shop. Large and varied collection including an extensive plant section, rocks and crystals, clothes and jewelery, candles, books, and apothecary. Excellent choice for all your Witchy needs
Ritualcravt
Wonderful shop in Estes Park that sells rocks, gems, and minerals. Very good prices including purchasing larger rocks by the pound. They also have a flock of super cute ducks out back that you can feed for $1
Red Rose Rock Shop
Very fun oddities shop. Great place for plants, bones, and wet specimen. Very aesthetic with a unique selection of curiosities.
Oddities and Curiosities - The Terrorium Shop
Wonderful rock and fossil shop located in the cute and quaint Georgetown. Super affordable prices (especially in comparison to Denver). Amazing fossil selection. Definitely worth the trip.