Flocks

Themed practice sets you can play any time. Each flock picks one specimen from that set. When you finish, you come back here. Flocks never change your daily streak.

Soft stones

The soft end of the Mohs scale: specimens at about 3 or under.

83 specimens

Gems & ornamental

Gemstones and ornamental stones from the library, as a smaller practice set.

50 specimens

State symbols

Official US state rocks, minerals and gems that have a page in the library.

11 specimens