Neolithic stone tool
Neolithic stone tools
Obsidian mineral stone
Snowflake obsidian
Flint knappings from making of tools.
Flints knapped for use as knives
Snowflake Obisidian
Obsidian, a glassy igneous rock
Obsidian
Variety of Igneous Rocks
Mahogany Obsidian, Oregon, USA
Obsidian bubbles
Mahogany obsidian
Obsidian flow
Obsidian specimen
Lava landscape
Obsidian-rich lava flow, Tenerife
Pebbles of snowflake obsidian rock lying on sand
Obsidian lava
Obsidian rock
Obsidian dome
Density of pumice and obsidian
Homo heidelbergensis tooth
Homo heidelbergensis teeth
Mousterian stone tool
Homo georgicus model
Neanderthal fossil skull La Ferrassie 1
Cro-Magnon 1 fossil skull
Homo heidelbergensis lower jaw
Homo habilis upper jaw (OH 65)
TOLOWA dancing head-dress 1923
黒曜石
Pebble tool
Quartz-feldspar porphyry
Olduvai biface stone tool
Homo heidelbergensis skull (Cranium 5)
Snowflake obsidian gemstone on white background
新緑の大瀧神社の御神体
Stone-age flint blades
El Torcal Megalithic Burial Mound
Early human, Stone Age culture
Flint arrowhead
Fossil Butte National Monument, Wyoming, USA
Volunteer at Fossil Butte National Monument visitor center
Tourmaline Pegmatite
Rubellite Tourmaline in Lepidolite Mica
Green Tourmaline in Muscovite, Maine
Polished sphere of ocean jasper
Tourmaline pegmatite
Amphibolite, light micrograph
Rhyolitic geode
Mica schist folds, light micrograph