Igneous Rocks Flash Cards

Intrusive Igneous Rock: Crystal size

• Small crystals

• Medium crystals

• Large crystals

• Very small crystals

Intrusive Igneous Rock: Texture

• Fine grained texture; smooth

• Coarse grained texture; rough

• Glassy texture; shiny

• Porous texture; lightweight

Extrusive Igneous Rock: Texture

• Coarse grained texture; rough

• Fine grained texture; smooth

• Porphyritic texture; mixed

• Glassy texture; shiny

Extrusive Igneous Rock: Texture

• Vesicular

• Granular

• Phaneritic

• Aphanitic

Examples of mafic igneous rocks

• granite

• basalt

• limestone

• sandstone

Examples of Extrusive Igneous Rocks

• Granite

• Obsidian

• Gneiss

• Marble

Examples of felsic igneous rocks

• granite, rhyolite, obsidian

• basalt, gabbro, diorite

• andesite, pumice, scoria

• peridotite, komatiite, basalt

Intrusive Igneous Rock: Color

• Single color

• Multiple colors

• Transparent

• Black only

Felsic Igneous Rock composition

• Aluminum and Silicon

• Iron and Magnesium

• Calcium and Sodium

• Potassium and Titanium

Mafic Igneous Rock

• High density and usually dark in color

• Low density and usually light in color

• High porosity and usually red in color

• Low viscosity and usually green in color