Calcite Rough Crystal not only increases and amplifies energy, but also raises learning abilities, so makes it a great stone for students, especially younger students who can be more prone to distractions. 

The orange variety also increases joy, provides a major boost for creativity and gives you that energy boost for when you are feeling low.

This stone also has the benefit of increasing sexual energy & pleasure ;)

Each stone weighs approx 20-30g. Size and shape may vary.