Object Based Learning

Types of Rocks

There are three main types of rocks: sedimentary, igneous, and metamorphic. Each of these rocks are formed by physical changes—such as melting, cooling, eroding, compacting, or deforming—that are part of the rock cycle.

Thumbnail of 'Acasta Gneiss'

Acasta Gneiss

Thumbnail of 'Andalusite-Biotite Hornfels (Thin Section 4)'

Andalusite-Biotite Hornfels (Thin Section 4)

Thumbnail of 'Cross-laminations in Sandstone'

Cross-laminations in Sandstone

Thumbnail of 'D107 Crinoidal Limestone'

D107 Crinoidal Limestone

Thumbnail of 'Igneous Granite'

Igneous Granite

Thumbnail of 'Ignimbrite'

Ignimbrite

Thumbnail of 'Olivine Basalt'

Olivine Basalt

Thumbnail of 'R20 Shale or Siltstone'

R20 Shale or Siltstone

Thumbnail of 'R24 Conglomerate'

R24 Conglomerate

Thumbnail of 'R36 Garnet-wollastonite hornfels'

R36 Garnet-wollastonite hornfels

Thumbnail of 'R44 Garnet-Chlorite Schist'

R44 Garnet-Chlorite Schist

Thumbnail of 'R4 Gabbro'

R4 Gabbro