This is a piece of crystalized rhodochrosite from the Sweet Home mine in Alma, Colorado. Rhodochrosite usually forms in a botryoidal formation, so having a full crystal structure is quite rare. This one also has exception color as well.
This piece comes in a perky box with a card displaying the stone name and locale.
The stone is approximately 1.5 cm x 1.1cm x 1.4 cm. The perky box is 3.5cm in all directions.