Uploaded February 2016 | Updated September 2026, 2 weeks ago
Magnesium sulfate heptahydrate is the dominant stable phase of hydrated magnesium sulfate crystals at temperatures between 0 and 50 degrees Celsius. Its crystal structure is orthorhombic.
Fast crystallisation methods do not produce large single crystals of magnesium sulfate heptahydrate - typically, multiple nucleation sites are produced, which results in fast growing small crystals.
The crystal morphology is elongated - the crystal grows a lot faster along one axis than the others, resulting in needle-like crystals.
In this video, two methods of fast crystallisation are demonstrated.
#1: Seeding of a Supersaturated Solution: Homogeneous Secondary Nucleation
#2: Fast Evaporation of a Hot Solution: Homogeneous Primary Nucleation
Magnesium sulfate heptahydrate is the dominant stable phase of hydrated magnesium sulfate crystals at temperatures between 0 and 50 degrees Celsius. Its crystal structure is orthorhombic.
Fast crystallisation methods do not produce large single crystals of magnesium sulfate heptahydrate - typically, multiple nucleation sites are produced, which results in fast growing small crystals.
The crystal morphology is elongated - the crystal grows a lot faster along one axis than the others, resulting in needle-like crystals.
In this video, two methods of fast crystallisation are demonstrated.
#1: Seeding of a Supersaturated Solution: Homogeneous Secondary Nucleation
#2: Fast Evaporation of a Hot Solution: Homogeneous Primary Nucleation
