Dana Crystal Models - monoclinic

This is a reproduction of "The Dana Set of Wooden Crystal Models" originally produced by Dr. Krantz Rheinisches Mineralien-Kontor (Bonn).

I recreated the models based on reference images in "Dana's Textbook of Mineralogy" (https://archive.org/details/DanasTextbookOfMineralogy), with forms taken from the catalogue available here (provided by the company): https://www.mineralogy.eu/archive/Krantz/Krantz_31_3.pdf

Whenever a model corresponds to a crystal structure, the known unit cell constants were used. In all other cases I approximated to match the pictures in Dana's book. Please note that I do not have an original set to compare, so there might be small differences. Also the scaling is arbitrary and probably totally different.

There's a labelled (by catalogue number) and unlabelled version. I also include the OpenScad file I used for embossing, in case somebody wants to adjust the labels. I'll add the other crystal systems as soon as I have enough time.

Changes I made to c