Sandstone is typically light tan, but can also appear in various shades of red and other colors depending on its composition.
Sandstone's characteristic color comes primarily from the minerals it is composed of and other elements present during its formation.
The Typical Color
Based on its composition, sandstone is predominantly a light tan color. This is because it is formed from light-colored minerals, predominantly quartz and feldspar.
Other Common Colors
While light tan is the most common color, sandstone can display a range of hues. One of the most frequent variations includes various shades of red.
- Red Sandstone: This color is often caused by the presence of iron oxide (rust) within the rock. The amount of iron oxide can vary, leading to shades from pinkish-red to deep reddish-brown.
Other less common colors can include:
- White (very pure quartz)
- Gray or black (presence of organic matter or other minerals)
- Yellow or brown (other forms of iron oxides or minerals)
Why Does Sandstone Have Different Colors?
The color of sandstone is a result of the minerals and cementing agents that bind the sand grains together.
| Color | Cause |
|---|---|
| Light Tan | Composed of light-colored minerals |
| Various Reds | Presence of iron oxide (rust) |
| White | High purity of quartz grains |
| Gray/Black | Organic matter or other dark minerals |
| Yellow/Brown | Other types of iron oxides or weathering |
Understanding the color of sandstone can provide clues about its geological history and composition.
