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Mahmut MAT

Volcanic Bomb

Agglomerate

Phenotrachytic welded tuff

Tuff

Scoria

Pumice

Camptonite lamprophyre (Mesozoic, 100-200 Ma; Campton Falls, Grafton County

Lamprophyre

Kimberlite

Pyroxenite (Stillwater Complex, Neoarchean)

Pyroxenite

Marl

Chalk

Siltstone

Oil Shale

15 Naturally Striped and Banded Rocks

Some rocks in nature display remarkable patterns of stripes, wavy bands, and contrasting layers, almost as if they had been painted by an artist....

Rocks That Float on Water: Types, Formation, and Examples

When you drop a rock into water, you usually expect it to sink. Most rocks are denser than water, so they quickly settle to...

Why Is My Rock Magnetic? 8 Common Magnetic Rocks and Minerals

When you bring a magnet close to a rock and notice that it is strongly attracted, the result can be surprising. If the rock...