jinis
gandheng tuff, tuff rhyolitic, basaltic tuff, trachyte tuff, tuff andesitic lan ignimbrite.
peat, lignite, sub-bituminous batu bara, bituminous batu bara, Anthracite, grafit
fitur
tansah ditemokake minangka pipo vulkanik liwat lemah ndhuwur Continental jero
mbantu ing produksi panas lan listrik, digunakake minangka bahan bakar fosil