Rock Classification (Leaving Cert Geography): Flashcards
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Practise the cards
15 cards from this deck
Three main rock groups
Three main rock groups
Igneous, Sedimentary, Metamorphic
Igneous rocks formed from
Igneous rocks formed from
Cooled volcanic material
Intrusive rocks: cooling speed & crystal size
Intrusive rocks: cooling speed & crystal size
Slow cooling, large crystals
Extrusive rocks: cooling speed & crystal size
Extrusive rocks: cooling speed & crystal size
Rapid cooling, small/no crystals
Granite mineral composition
Granite mineral composition
Quartz, mica, feldspar
Granite texture
Granite texture
Coarse-grained, large crystals
Basalt texture
Basalt texture
Fine-grained, small crystals
Basalt column shape
Basalt column shape
Six-sided columns (columnar basalt)
Lithification process
Lithification process
Compaction and cementation
Limestone composition
Limestone composition
Calcium carbonate (CaCO₃)
Organic limestone formed from
Organic limestone formed from
Skeletal remains: teeth, bones, shells
Irish limestone example location
Irish limestone example location
The Burren, Clare
Metamorphic rocks formed by
Metamorphic rocks formed by
Heat and/or pressure on igneous/sedimentary rocks
Quartzite parent rock
Quartzite parent rock
Sandstone
Quartzite key properties
Quartzite key properties
Non-porous, harder than sandstone, resistant to weathering