Black Lavastone, also known as Pedra Hitam Preta and Temple Stone, is an extrusive igneous rock that originates from the eruption of Mount Merapi in the province of Central Java, Indonesia. Black Lavastone has a unique black color with low porosity. This stone is also weather-resistant and was used to build the Borobudur and Prambanan temples which have stood for a century without any damage from nature.