Colombianite

Colombianite
Also known as Piedra Rayo, which translates to “Lightning Stone”
Approximately 30 million years old
A sacred stone for humanity
Can reignite the spiritual fire within us
Well suited to people who are awakening
Can help us reflect on past life experiences
Helps unlock hidden energies to form new transformative capabilities
Most effective when used during meditation, especially when placed on the third eye or near the root chakra
Considered a pseudo tektite 
Hand mined from the regions of Colombia, coming out of the area of Caeca
 
These are priced by weight and not necessarily by size.  There isn't a huge difference in the sizes of these, but I like to spread it out to create as many different price point options that I can.  This is why I use a coin in my photos.