Lava Stone is also known as Basalt, and is the result of an eruption of a volcano at some time in the past, which created lava which over time cooled then solidified into these rocks.
Their stone properties relate to the way they embody the vibration of all of the four elements within them, as they were part of the process that created them.
As these stones also contain the powerful energy of the volcano that created them, this means that they are excellent to aid healing, especially when you are feeling depressed or lacking energy and vitality.
Rounded shaped stones like the one shown here, have an association with feminine energy, and long pointed stones embody male energy.
A combination of both stones were used in the past in fertility rituals to aid conception of a child.