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obsidian
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obsidian obsidian boulders obsidian volcanic glass Eight labeled rock samples are shown, including black glassy obsidian, speckled porphyry, striped calico sandstone, shell-filled coquina limestone, coarse breccia, layered banded gneiss, pale green fibrous talc schist, and greenish serpentine.
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Basalt sample returned by Apollo 15, from near a long sinous lunar valley called Hadley Rille. Measured at 3.3 years old.
(Bed) Rocks and (Flint) Stones
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obsidian
Crusted obsidian.
Daniel Mayer
obsidian boulders
Obsidian boulders formed from lava flow.
© Steve Estvanik/Fotolia
obsidian
Obsidian.
Encyclopædia Britannica, Inc.
volcanic glass
Dark, reflective, obsidian sitting atop gray rocks near the Panum Crater in Mono...
Daniel Mayer
rock textures
Rocks have many different textures. Layered sandstone produces a gritty texture,...
Encyclopædia Britannica, Inc.
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