Struvite (magnesium ammonium phosphate) is a phosphate mineral with formula: NH4MgPO4·6H2O. Struvite crystallizes in the orthorhombic system as white to yellowish or brownish-white pyramidal crystals or in platey mica-like forms.

Struvite formation, control and recovery
Predicting struvite formation in digestion
Struvite precipitation thermodynamics in source-separated urine.
Dissolution of struvite urinary stones. Experimental studies in vitro
Spontaneous precipitation of struvite from aqueous solutions
Controlled struvite crystallisation for removing phosphorus from anaerobic digester sidestreams.
Phosphorus Recovery from Wastewater by Struvite Crystallization: A Review
Struvite precipitation in anaerobic swine lagoon liquid: effect of pH and Mg:P ratio and determination of rate constant
An economic evaluation of phosphorus recovery as struvite from digester supernatant
Phosphate removal in anaerobic liquors by struvite crystallization without addition of chemicals: Preliminary results