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Agate breccia |
Brecciated agate from the Black Forest, Germany. |
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Dunite xenolith |
Dunite xenolith in basaltic lava. |
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Dunite |
Dunite is a common rock in the mantle that is composed almost exclusively of olivine. |
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Impact breccia from the Ries crater |
Silicified limestone brecciated by the impact event that created the Nördlinger-Ries meteorite crater. |
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Migmatized gneiss from Norway |
Highly folded migmatized gneiss from Norway. |
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Hydrothermally altered granite |
Green epidote vein in granite. |
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Leucoxene |
Leucoxene is mined for its titanium content. |
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Mylonite from Estonia |
Metamorphic rock with ‘eyes’ or augens. |
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Most famous gneiss in the Internet |
The story of a gneiss hand sample. |
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Olivine basalt |
There are really lots of olivine grains in this basalt from Oahu, Hawaii. |
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Scoria from Etna |
Scoria is highly vesicular glassy volcanic rock. But what is the difference between scoria and pumice? |
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Limburgite |
Limburgite is a volcanic rock that contains no feldspar. |
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Diabase |
Diabase is a decorative rock type that is related to basalt and gabbro. |
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Sea glass |
Some sand grains are made of artificial material. One of the best examples is glass which turns into rounded and beautiful glass pellets sometimes found in beach sand. |
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Obsidian |
Obsidian is a massive volcanic glass. Find out what it means. |
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Rapakivi granite |
Rapakivi is a special type of granite with an interesting texture. |
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Ruskeala marble |
Marble from Ruskeala quarry in Karelia. |
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Lunar anorthosite |
Anorthosite on the Moon is many ways different from its terrestrial cousin. |
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Anorthosite |
Anorthosite is famous for its play of colors. Find out what causes it. |
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Jotnian sandstone |
This feldspar-rich rock is usually named either Jotnian sandstone, quartzite, or arkose. |
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Columnar basalt |
Basalt columns and lava rosette. |
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Conglomerate |
This rock is composed of rocks. |
