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Download Igneous Rocks – Formed by the cooling and hardening
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Igneous Rocks – Formed by the cooling and hardening of melted rock. There are two main types of igneous rock determined by the cooling process. Intrusive – rocks that form inside the earth due to magma cooling slowly producing a large crystal texture EX. Granite, Gabbro Extrusive – rocks that form on the surface of the earth producing small crystals due to rapid cooling of lava EX. Basalt Obsidian - extrusive lava rock that cools extremely fast producing a glassy appearance without crystals Pumice – extrusive sponge-like rock with pores due to trapped gases during rapid cooling of lava Rock Families This is a grouping of igneous rocks determined by mineral composition (certain minerals re-crystallize at certain temperatures – This is independent of speed of cooling Olivine ---- Augite --- Hornblend ---Mica ----Quartz (Magnesium)single chain(double chains)(sheets) (network) Iron mineral Feldspar Rock Families 1) Mafic –Made of minerals that recrystalize first containing Magnesium and iron (Fe) Dark in color from the iron EX. Intrusive - Gabbro Extrusive - Basalt 2) Intermediate – Second to recrystallize and are medium in color between dark and light EX. Intrusive – Diorite Extrusive – Andesite 3) Felsic - Last minerals to recrystallize to form these rocks. Light in color from the feldspar and quartz (SiO2) EX. Intrusive - Granite Extrusive – Rhyolite and Obsidian Igneous Rocks – Formed by the cooling and hardening of melted rock. There are two main types of igneous rock determined by the cooling process. Intrusive – EX. Extrusive – EX. Rock Families This is a grouping of igneous rocks determined by mineral composition (certain minerals re-crystallize at certain temperatures – This is independent of speed of cooling Olivine ----( Augite ---( Hornblend ---(Mica-----(Quartz (Magnesium single chains (double chains) (sheets) (network) Iron mineral Feldspar Rock Families 1) Mafic –Made of minerals that recrystalize first containing Magnesium and iron (Fe) Dark in color from the iron EX. Intrusive Extrusive - 2) Intermediate – Second to recrystallize and are medium in color between dark and light EX. Intrusive – Extrusive – 3) Felsic - Last mineral to recrystallize form these rocks. Light in color from the feldspar and quartz (SiO2) EX. Intrusive Extrusive –
