CRYSTALLIZATION

Provided by: Paul Heller, University of Wyoming

These movies, not much related to sedimentary geology, but useful just the same to show crystallization of salts into different crystal systems. The method used was that described by Christman (1981). Each video is sped up to fill about 20 seconds of play time.

NaCL (halite) 20 seconds (1.9 MB) &endash; cubic (isometric) crystal system. The red circle outlines one crystal that is worthwhile watching grow.


Copper Sulfate (CuSO4) 19 seconds (1.9 MB) &endash; orthorhombic crystal system. A glitch caused us to lose a minute or so in the middle of the movie. As a result, there is an abrupt jump in time. Sorry about that.


Aluminum Potassium Sulfate (KAl(SO4)2 • 12H2O) 20 seconds (1.9 MB) - Monoclinic or hexagonal crystal system. Crystals nucleate at different sites so they grow together over time.


Potassium Permanganate (KMnO4) 20 seconds (2.0 MB) - Orthorhombic crystal system. The KmnO4 in the last stages of crystallization, it was energetically more efficient to crystallize on the existing crystals rather than nucleate new crystals. This provides a dramatic ending.

 

Reference:

Christman, Robert, A., 1981, Growing crystals on the ceiling: Journal of Geological Education. 28; 4, Pages 199-201. 1980. .

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