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2 ROCK Composed of one or more minerals Classified byOrigin – how they were formed Mineral Content Texture

3 ROCK Composed of one or more minerals Classified byOrigin – how they were formed Mineral Content Texture

4 ESRT Page 6 http://www.youtube.com/watch?v=aCnAF1Opt8MIGNEOUS ROCKS ESRT Page 6

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6 Formation Solidification of magmaMade up of inter grown mineral crystals Environments a. Magma – below ground b. Lava – above ground

7 a. Texture Determined by the rate of cooling, refers to the size, shape and arrangement of crystals which grew out of the cooling magma/lava

8 1. Intrusive You can visibly see the ____________ Mineral crystalscools slowly, deep beneath the Earth’s surface Coarse or very coarse (large to medium crystals) Mineral crystals

9 Pegmatite – Very Coarse Texture

10 Granite - Coarse Texture

11 2. Extrusive Very small or no _______________cooled quickly on earth’s surface fine grained (can see with a hand lens) glassy no crystals Mineral crystals

12 3. Porphyritic Contains crystals of two markedly different sizesidentify with the majority of crystals

13 4. Vesicular Porous from trapped gas pockets

14 b. Color Based on the mineral content or what it is made of

15 Mafic Dark colored, high in Iron (Fe) and Magnesium (Mg), more dense

16 Felsic Light colored, high in Aluminum (Al) and Silicon (Si), less dense

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23 HOW DO YOU KNOW ITS AN IGNEOUS ROCKMineral Crystals or Vesicular – Gas pockets

24 Order in which minerals crystallize from a cooling magma/lava to form igneous rocks

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