lava basalt, pillow lava from melange tectonic complex

amphobole asia associated basalt biotite boulder brown bulding central closeup complex concept cretaceous earth education element extrusive geological geologist graduate granite identified igneous indonesia irin java karangsambung lava magma mangan melange metamorphic mid mineralogy minerals miosen morphology mountain nature oceanic ophiolite oxide paleocen peridotite pillow porous pyroclastic rare red research rocks sample science silica soil specimen stone structur study subduction survey tectonic tertier texture volcanic