The 3 ROCKATEERS

By: Olivia Soto

What's a Rock?

A solid mineral material that forms part of the surface of the earth and other similar places, that are made of crystals and are identified on texture, and origin of its formation

Different Rockateers

Gabbro

  • Formed in an intrusive environment(inside the volcano) slowly
  • coarse texture with 1mm-10mm
  • non-vesicular
  • dark color/high density/Mafic composition
  • 60% Pyroxene/40% Plagioclase feldspar/5% Amphibole/5% Biotite

Sandstone

  • Inorganic
  • Clastic fragmental texture
  • Sand size 0.0004-0.006
  • Mostly Quartz, feldspar, and clay minerals; may contain fragments of other rocks and minerals
  • Fine-coarse

Gneiss

  • Foliated Banding
  • Medium to coarse grain size
  • Pyroxene/Garnet/Amphibole/Feldspar/Quartz/Mica
  • Increased heat and pressure (regional)
  • High grade Metamorphism;mineral types segregated into bands

The Rock Cycle

The Rock Cycle is a group of changes. Igneous rock can change into sedimentary rock or into metamorphic rock. Sedimentary rock can change into metamorphic rock or into igneous rock. Metamorphic rock can change into igneous or sedimentary rock.

Igneous rock forms when magma cools and makes crystals. Magma is a hot liquid made of melted minerals. The minerals can form crystals when they cool. Igneous rock can form underground, where the magma cools slowly. Or, igneous rock can form above ground, where the magma cools quickly.

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