This dual style frost pattern formed on the inside of a storm window glass - the straight line frost was towards the center of the window and the "crystal" patterns are near the edge of the glass.
Clean water (distilled) when solidified generally presents a 6 lobed crystal - the lobes radiating at 60 degrees from one another - generated by the molecular structure of water.
But if you add the residue on the surface of the glass left from a glass cleaner or solvent - what is the molecular structure of the moisture on the glass then?
The straight line crystals on the right hand of the image intersect at very acute angles - much less than 60 degrees.
At the interface between the straight lines and the more "conventional" frost there are loops where the conventional does a turn and then goes off in the opposite direction in a straight line.
The straight lines have a pattern similarity to an aerial view of dirt roads in the Mojave Desert [1]. What's that similarity all about?
How is "contamination" of silica crystals used to make photo voltaic electrical generation?
How about the similarity to the header image today [2]?
desert image coutesy http://members.tripod.com/airfields_freeman/CA/Airfields_CA_SanBernardino_SE.htm [3]
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