sedimentary
Green Sandstone (Glauconitic Sandstone)
Glauconitic Sandstone (K(Fe,Al)2(Si,Al)4O10(OH)2)
Hardness: 6-7 (on Mohs scale for grain components); Color: Pale green to olive green; Luster: Dull, earthy; Structure: Clastic, fine-to-medium grained; Specific Gravity: 2.6-2.8.
- Hardness
- 6-7 (on Mohs scale for grain components)
- Color
- Pale green to olive green
- Luster
- Dull, earthy
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Physical properties
Hardness: 6-7 (on Mohs scale for grain components); Color: Pale green to olive green; Luster: Dull, earthy; Structure: Clastic, fine-to-medium grained; Specific Gravity: 2.6-2.8.
Formation & geological history
Formed in marine environments through the accumulation and lithification of sand-sized grains, specifically enriched with the mineral glauconite which provides the green coloring. Often dates from the Cretaceous or Eocene periods.
Uses & applications
Used primarily as decorative stone, construction aggregate, and occasionally in soil amendment due to potassium content. Some varieties are used as architectural veneers.
Geological facts
The green color is primarily due to the presence of glauconite, an iron-potassium silicate. This material is often referred to as 'greensand' when it is unconsolidated.
Field identification & locations
Identify in the field by its distinctive green hue and gritty sand-like texture. It is commonly found in coastal regions or areas that were ancient prehistoric seabeds.
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