Green Sandstone

Physical Properties

Hardness: 6-7 (Mohs scale); Color: Olive green to greenish-grey; Luster: Dull to earthy; Crystal structure: Clastic (granular); Cleavage: None (breaks across grains); Specific gravity: 2.5-2.8.

Formation & Geological History

Formed through the accumulation and cementation of sand-sized mineral grains, specifically containing glauconite or green chlorite. This typically occurs in Marine environments where organic matter and iron-rich minerals react over millions of years.

Uses & Applications

Used primarily in construction as a building stone or road aggregate. Also used in landscaping and sometimes as a source of potash in fertilizer if high in glauconite.

Geological Facts

The green color is usually due to the presence of silicate minerals like chlorite, glauconite, or epidote. Glauconitic 'greensands' are famously found in Cretaceous and Paleogene deposits globally.

Field Identification & Locations

Identify by its gritty texture and distinct green hue. It often feels like sandpaper. Look for it in coastal cliff areas or basins where ancient sea beds are exposed.

Identified on: 4/17/2026

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