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.
34 specimens in this category
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Agglomerate
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Andesite
Hardness: 7
Anorthosite
Hardness: 6 - 6.5
Aplite
Basalt
Hardness: 5 - 6
Carbonatite
Hardness: 3 - 4
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Coppernite
Hardness: 5.5 - 6
Dacite
Hardness: 6 - 7
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Diabase
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Diorite
Hardness: 6 - 7
Felsite
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Gabbro
Hardness: 6
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Galaxyite
Hardness: 6 - 6.5
Granodiorite
Hardness: 6
Greisen
Hornblendite
Hardness: 5 - 6
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Kiwi Stone
Hardness: 6 - 7
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Lamprophyre
Larvikite
Hardness: 6 - 6.5
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Monzonite
Pegmatite
Hardness: 6 - 7
Peridotite
Hardness: 6.5 - 7
Perlite
Hardness: 5.5
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Phonolite
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Pitchstone
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Porphyry
Pumice
Hardness: 6
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Pyroxenite
Hardness: 5 - 7
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Rhyolite
Hardness: 6
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Scoria
Hardness: 5 - 6
Syenite
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Trachyandesite
Trachyte
Hardness: 6
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Tuff
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