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SourceSource:1. Deeper and Deeper: Discovering Rocks and Minerals, 2007, Mining Matters2. Rock Star101: Introduction to Ro...
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Rock Discovery - Clues you can use

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Identifying and classifying the different types of rocks is not an easy task, but you can have some success by using the following clues as a starting point. **Reference document used in the Rocks and Minerals session during the EdGEO Teacher Workshop at GACMAC 2013. Presented by Mining Matters.**

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Rock Discovery - Clues you can use

  1. 1. SourceSource:1. Deeper and Deeper: Discovering Rocks and Minerals, 2007, Mining Matters2. Rock Star101: Introduction to Rocks, 2012, Minerals Ed BCIdentifying and classifying the different types of rocks is not an easy task, butyou can have some success by using the following clues as a starting point.Sedimentary RocksSedimentary rocks are formed from sediments or precipitation of crystals in waters at ornear Earth’s surface. The sediments are compacted and cemented when buried.o Broken, rounded particles of varying sizeso Particles may originate from rock or mineralso Relatively soft and friableo Grains held together by mineral cemento Sometimes dull looking (not crystalline)o Layered at various scaleso May contain fossilso May react with acid (fizzes)o May be crystalline (Chemical sedimentary rocks)Igneous RocksIntrusive (Plutonic) - Formed from molten rock; underground; cooled very slowly;,formed coarse mineral crystals.o Coarse crystalso Grains you can see; speckledo HardExtrusive (Volcanic) - Formed molten rock or volcanic fragments at or near Earth’ssurface; cooled quickly; formed fine mineral crystals.o Grains too small to see with naked eyeo Crystalline, sparklyo Trapped gas bubbles (vesicles)o Hard (most)Metamorphic RocksMetamorphic rocks form from any type of pre‐existing rock subjected to high pressureand/or high temperature.o Prominent layering defined by aligned minerals (banded, foliation)o Crystalline, coarse or fine (sparkly)o Wavy, irregular layeringo Very hardRock Discovery: Clues you can use

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