Igneous

Igneous rocks form when molten rock (magma or lava) cools and solidifies. They are classified as either intrusive (plutonic) or extrusive (volcanic) depending on where they formed.

8 specimens starting with "P" (of 34 total)

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All A B C DEF G HIJK L MNOPQR S TUVWXYZ0-9

Pegmatite

Hardness: 6 - 7

Peridotite

Hardness: 6.5 - 7

Perlite

Hardness: 5.5

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Phonolite

No image

Pitchstone

No image

Porphyry

Pumice

Hardness: 6

No image

Pyroxenite

Hardness: 5 - 7

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Minerals (5084)Other (498)Metamorphic (25)Quartz (23)Zeolite (22)Sedimentary (22)Tourmaline Group (18)Fossil (15)Chalcedony (15)Jasper (12)Eudialyte group (9)Calcium Amphibole Subgroup (8)View All Categories

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