Rocks
|
Rock types
|
Find Rocks
|
Rocks Identification
|
Rock Collecting
|
Hints for rock collectors


Metamorphic Rocks


2 slightly different types of quartzite

Metamorphic Rocks - Quartzite

Colour: White, grey, reddish.

Texture: Medium-grained; usually of a granoblastic texture.

Structure: Usually massive but primary sedimentary features may be preserved, such as bedding, graded bedding or current bedding.

Mineralogy: Essentially composed of tightly interlocking grains of quartz. A little feldspar or mica may also be evident. White varieties are distinguished from marble by their greater hardness.

Field relations: Quartzites are metamorphosed quartz sandstones and are found in association with other metamorphosed sedimentary rocks such as phyllite, schist and marble."

(Hamilton et al 1976, 148)

Common Metamorphic Rocks:
Slate
|
Gneiss
|
Quartzite
|

Top
Rock types:
Igneous Rocks
|
Sedimentary Rocks
|
Metamorphic Rocks
|