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Manganese ore – psilomelane (size: 6.7 × 5.8 × 5.1 cm)
Manganese ore – psilomelane (size: 6.7 × 5.8 × 5.1 cm)
Lead ore – galena and anglesite (size: 4.8 × 4.0 × 3.0 cm)
Lead ore – galena and anglesite (size: 4.8 × 4.0 × 3.0 cm)
Granitic pegmatite composed of plagioclase and K-feldspar, large hornblende crystal present. Scale bar is 5.0 cm
Granitic pegmatite composed of plagioclase and K-feldspar, large hornblende crystal present. Scale bar is 5.0 cm
Piece of kimberlite. 11.1 cm x 4.5 cm
Piece of kimberlite. 11.1 cm x 4.5 cm
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The Grand Canyon, an incision through layers of sedimentary rocks.
The Grand Canyon, an incision through layers of sedimentary rocks.
A balancing rock called Kummakivi (literally "strange stone")
A balancing rock called Kummakivi (literally "strange stone")
Rock outcrop along a mountain creek near Orosí, Costa Rica.
Rock outcrop along a mountain creek near Orosí, Costa Rica.
Sample of igneous gabbro
Sample of igneous gabbro