Optical calcite was used as a navigation tool by Vikings to cross oceans. All calcite clears energy. Check measurements next to a quarter, which is roughly one inch. These measure approximately 1.16x1.95x1”-1.61x1.07”. The weights are between 46-180 grams each. There are both honey and clear calcite as choices. Choose the piece you like best using the numbered tags in the videos. The pictures and videos show the quality of the item you will receive. The price listed is for one piece.