igneous rocks based on texture and composition (#2.2)

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Aphanitic

TYPES OF IGNEOUS ROCKS BASED ON TEXTURE:

fine-grained rocks since there are small mineral crystals

• ex. rhyolite

Phaneritic

TYPES OF IGNEOUS ROCKS BASED ON TEXTURE:

course-grained rocks due to large mineral crystals

• ex. granite

Vesicular

TYPES OF IGNEOUS ROCKS BASED ON TEXTURE:

Rock that contains tiny holes called vesicles due to gas bubbles in the lava.

• ex. pumice & scoria

Glassy

TYPES OF IGNEOUS ROCKS BASED ON TEXTURE:

Glassy textures result from the rapid cooling of lava

• ex. obsidian

Porphyritic

TYPES OF IGNEOUS ROCKS BASED ON TEXTURE:

Rocks where larger crystals (phenocrysts) are embedded in smaller crystals (groundmass)

• ex. Granitic porphyry

Pyroclastic

TYPES OF IGNEOUS ROCKS BASED ON TEXTURE:

the rock is formed from the consolidation of individual rock fragments that are ejected during a volcanic eruption

• ex. Volcanic breccia or tuff

1. Felsic (Granitic) - light

2. Intermediate (Andesitic) - gray

3. Mafic (Basaltic) - dark

4. Ultramafic - dark/green

4 types of igneous rocks based on composition