1. Identification of Rocks is by texture and composition
Rocks are aggregates of minerals
Identification of Rocks is by texture and composition
Texture is the size, shape and arrangement of grains
Composition is the minerals in the rock.

2. Grain Size
Fine
Medium
Coarse
Glassy

3. Arrangement - Cemented

4. Arrangement - Interlocking

5. Arrangement - Foliated
Arrangement - Frothy

6. 04_02.jpg Igneous Rocks – cooling of magma or lava.
Intrusive and Extrusive
Composition: silicic, mafic, intermediate

7. Sedimentary Rocks Chemical – precipitated from water – interlocking
Clastic – cemented fragments
Carbonates – cemented shell fragments
Chemical – precipitated from water –
interlocking
Composition (Minerals): calcite, dolomite, quartz,
halite

8. Regional Metamorphism - Foliation

9. 06_17.jpg
Marble
Limestone
Contact Metamorphism of Limestone