sedimentary
Glauconitic Sandstone
Glauconitic Quartz Arenite
Hardness: 6-7 (Mohs scale) for grain matrix; Color: Dull green, olive, or grey-green with orange/brown iron staining; Luster: Earthy to dull; Crystal structure: Granular/Clastic; Cleavage: None; Specific gravity: 2.2-2.8
- Hardness
- 6-7 (Mohs scale) for grain matrix
- Luster
- Earthy to dull
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Physical properties
Hardness: 6-7 (Mohs scale) for grain matrix; Color: Dull green, olive, or grey-green with orange/brown iron staining; Luster: Earthy to dull; Crystal structure: Granular/Clastic; Cleavage: None; Specific gravity: 2.2-2.8
Formation & geological history
Formed in marine shelf environments with slow sedimentation rates, typically during the Cretaceous or Paleogene periods. It results from the alteration of mica or fecal pellets in shallow sea floors.
Uses & applications
Used primarily as a soil conditioner (Greensand) due to potassium content, a water softener, and historically as a pigment in paints.
Geological facts
Also known as 'Greensand,' it is an excellent indicator of ancient marine environments and slow deposition. The green color comes from the iron-rich silicate mineral glauconite.
Field identification & locations
Identify by its characteristic dull green 'salt and pepper' appearance and crumbly to sandy texture. Common in coastal plain regions like New Jersey, USA, or the South East of England.
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