石刃, 舊石器時代晚期, 微觀, 結晶, 鑒定, 43,000 - 28,000 years ago, Upper Paleolithic prismatic Flake Blade, 3.8 cm, Authentication, microscopy, crystals, anorthite,
石刃, 舊石器時代晚期, 微觀, 結晶, 鑒定, 43,000 - 28,000 years ago, Upper Paleolithic prismatic Flake Blade, 3.8 cm,石刃, 舊石器時代晚期, 微觀, 結晶, 鑒定,