schist mica metamorphic rock from melange tectonic complex, indonesia

asia beautiful biotite calcite cave central chlorite closeup complex compreesure compression crystal crystaline description earth element engineering environment exploration feldspar foliated formation fracture fresh gem geological geology green grey grown hexagonal hydrothermal identification indonesia java limestone luster macro magnetite melange metamorphic mica mineral mineralization mineralogy natural nature object ophiolite ore outcrops oxide pebble petrology pink quartz reflection rock rocks sample schist scinece shale shiny silicate specimen stone structure stucture study survey tectonic texture this trench vein white zone