Apatite

Although you might associate its name with hunger, its name Apatite comes from a Greek word ἐξαπατάω meaning “to deceive”. It earned this name due to commonly being mistaken for other gems! It actually belongs to a group of phosphate minerals and comes in a few colors but most notably, the electric blue. Apatite is actually slightly radioactive as it contains small trace amounts of elements like uranium and strontium-90 but don’t worry, its not enough to effect you! so enjoy it

Hardness: 5
Composition: Ca₅(PO₄)₃(OH,F,CI)