Geology

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Amusing Planet
El Torcal de Antequera is a nature reserve in Antequera, Spain; known for its unusual karst limestone formations (Jurassic 150 Ma ago)
Columnar Basalt on the Icelandic Coast
Columnar Basalt on the Icelandic Coast
Argulite is from Utah, closely re-lated to rhyolite. Both are products of sediment being super heated by lava. Also called Earthquake Jasper, a name that it was given because its patterns were created by cracks from earthquakes which were then re-fused
ø Snowflake Obsidian | The Gemstone List ø
Snowflake Obsidian is a type of obsidian which, rather than being pure black, has patches of white coloration that look like snowflakes. The snowflakes are formed from radial crystals of cristobalite, a variety of quartz with a different structure.
Kakortokite is a rare intrusive igne-ous rock, a rock of variable compo-sition occurring in Greenland in black/ white/ red sheets. Magmatic layering occurs in the lower portions of old magma chambers; a mixture of nepheline syenite (white), arfvedsonite (black), amphibole (red), also occasionlly sodalite & rinkite results. The red sometimes looks like yellow Eudialyte. It has some fluorescent properties/ can have orange spots, blotches/ some blue streaks, veins & patches
Geologist's rainbow by Frank Townsley
Petrified rock in Petrified Forest National Park, Arizona