Code Name : Black Flagstone
The word of 'Candi' for this type of stone is derived from the same source of the basic stone material that founded the famous Borobudur temple in Magelang Indonesia. Density level of this lavarock is very hard, but has a high porosity that makes it easy to absorb water.
Candi is one type of Lavastone or Basalt which is an extrusive volcanic rock. It is usually grey to black similar to Andesite and fine-grained due to rapid cooling of lava at the surface of a planet.