Molten rock is having its moment. Lava stone in home décor is typically found in muted shades of gray, brown and black. Volcanoes produce many types of lava because of the varying elemental composition of the molten rock. So, when the lava cools it forms different rock types, such as basalt, pumice and obsidian. Knowing the characteristics of the different types can make or break...

Source: Wall Street Journal March 08, 2018 15:45 UTC