sedimentary
Glauconitic Sandstone
Glauconitic Sandstone (Greensand)
Hardness: 2-3 (Mohs scale), Color: Dull green to bluish-green, Luster: Earthy/Dull, Crystal structure: Complex silicates (Monoclinic), Specific gravity: 2.4-2.95
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Physical properties
Hardness: 2-3 (Mohs scale), Color: Dull green to bluish-green, Luster: Earthy/Dull, Crystal structure: Complex silicates (Monoclinic), Specific gravity: 2.4-2.95
Formation & geological history
Formed in marine environments through the chemical alteration of mica or fecal pellets in shallow Continental shelf waters; typically Cretaceous or Tertiary in age.
Uses & applications
Used primarily as a soil conditioner and natural fertilizer due to high potassium content; historically used as a dye and in water softening systems.
Geological facts
Commonly known as 'Greensand' in agricultural circles, it has been used as a soil amender for centuries. It takes its name from the Greek word 'glaukos', meaning blue-green or shimmering.
Field identification & locations
Identify by its distinctive dull green hue and crumbly texture. Often found in coastal sedimentary deposits. Collectors should look for micro-fossils often embedded within.
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