sedimentary
Glauconite sand
Glauconite (K,Na)(Fe,Al,Mg)2(Si,Al)4O10(OH)2
Hardness: 2 Mohs; Color: dark green to olive green; Luster: dull to earthy; Structure: monoclinic (usually in granular pellets); SG: 2.4-2.95
- Hardness
- 2 Mohs
- Color
- dark green to olive green
- Luster
- dull to earthy
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Physical properties
Hardness: 2 Mohs; Color: dark green to olive green; Luster: dull to earthy; Structure: monoclinic (usually in granular pellets); SG: 2.4-2.95
Formation & geological history
Forms in marine environments on continental shelves through the chemical alteration of mica or organic matter in shallow, low-oxygen waters. Often found in Cretaceous and Tertiary deposits.
Uses & applications
Used as a water softener (zeolite properties), soil conditioner (slow-release potassium), and as a green pigment for artists.
Geological facts
Often called 'Greensand' due to its color. It is a vital indicator of marine depositional environments and is used by geologists for radioactive dating of sedimentary rocks.
Field identification & locations
Identify by its distinct dark green color and sandy, crumbly texture. Found in coastal sedimentary layers like those in New Jersey, USA, or the UK.
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