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matthias_lang

Geometry and crystal shape help needed

5 years ago

I'm helping a teenager with his science fair project. At this point he is just reading up on the subject. He will be growing some crystals that are in one place described as "quadratic prisms". We've only found one source to mention quadratic prisms as a subset of quadrilateral prisms (along with rectangular prisms, parallelepipeds, and trapezoidal prisms). We don't know what a quadratic prism looks like, and how it is different from other rectangular prisms. We haven't found a definition on the internet either.


Another source describes the crystals he will grow as "tetragonal crystal systems," and we are able to find a meaning for this: Three axes are all perpendicular to one another, with one axis being shorter or longer than the other-- so either a squat rectangular prism or an elongated rectangular prism, but not a cube.


Is anyone familiar enough with these terms to tell us if a "quadratic prism" is really the same as a "tetragonal crystal."?

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