Lightning quartzes with natural etching sometimes referred to as "lemurian" lines, some have inclusion or mineral overlay. They are sourced from the “Serra de Espinhaco" mountain range in Brazil. These quartzes were struck by lightning and rapidly expanded and contracting, leaving a rippled texture, and sometimes a visible pathway that the lightning took through the crystal.
The piece you receive may not look identical to what is pictured, as these are highly unique crystals. It will be between 2" and 4" in length