You were in a gem mine and was mining, you found onyx! A parallel banded variety of chalcedony, a silicate material! This gem is very hard on the Mohs scale. Your friends are here. William: Nice gem, buddy. Alexander: The gem is hard to find. Ava: Woah, that gem looks like it should be used in jewelry! Emily: It's great you found the onyx. It's hard to find it.