hand sample of rock with bokeh shoreline background

abraded abrasion action banding basalt beach coast coastal coastline collecting collector curiosity curious dark dissolved earth education entertainment environment exemplar fluvial formation gas geological geology geoscience gneiss gray grey holes holey identification igneous inclusion level metamorphic metamorphism migmatite mineral ocean particle pebble porphoritic porphory raw resistant rocky rounding science sea seashore sediment sedimentary sized stone stony story texture tidal tides undefined unpolished vesicular vesicules view washed washing wave waves