Rock Identifier
Sodium Polyacrylate (Superabsorbent Polymer) (Sodium Polyacrylate [-CH2-CH(COONa)-]n) — mineral (synthetic)
mineral (synthetic)

Sodium Polyacrylate (Superabsorbent Polymer)

Sodium Polyacrylate [-CH2-CH(COONa)-]n

Hardness: variable (solid) to gel-like (liquid-state); Color: White powder/granules or clear gel; Luster: Dull/Matte (dry) to Vitreous (saturated); Crystal Structure: Amorphous; Cleavage: None; Specific Gravity: ~1.22

Hardness
variable (solid) to gel-like (liquid-state)
Color
White powder/granules or clear gel
Luster
Dull/Matte (dry) to Vitreous (saturated)
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Physical properties

Hardness: variable (solid) to gel-like (liquid-state); Color: White powder/granules or clear gel; Luster: Dull/Matte (dry) to Vitreous (saturated); Crystal Structure: Amorphous; Cleavage: None; Specific Gravity: ~1.22

Formation & geological history

Produced via free-radical polymerization of acrylic acid partially neutralized with caustic soda. While synthetically manufactured today using petroleum-based feedstocks, it mimics the extreme water-retention properties of certain natural hydrogels.

Uses & applications

Primary use in hygiene products (infant diapers), hydrogel for medical dressings, and as a soil conditioner in agriculture to retain moisture in arid environments.

Geological facts

Known as the 'super slurper,' it can absorb between 400 to 800 times its mass in distilled water. It was originally patented for use in agricultural soil moisture control.

Field identification & locations

Identify in the 'field' (household context) by the presence of a grainy, sand-like substance when dry that becomes a clear, slippery gel when wet. Found globally in consumer packaged goods.

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