Geological Series of Field Museum of Natural History. Vol. VII. Chicago, December 28, 1937. No. 3. Asterism in Garnet, Spinel, Quartz and Sapphire, pp. 39-57

The geology book will tell you about asterisms in garnet, spinel, quartz, and sapphire, and many other fossils. A lot of work has been done to study the minerals. Here, for example, is brief information about an asteroid almandine garnet which has two spheres, displayed in the hall of H. N. Higinbotham Field Museum of Natural History. The asterism of each of the spheres combines four large circles, narrow, detailed lines with a specific angular interaction in the direction of symmetry, and, of course, with some angular relationship to each other. In the course, it turns out that at 12 identical crystallographic points, spheres with two stripes intersect, forming a four-ray star at each point of the intersection, which means that they create twelve four-yard stars, each of which has two angles. A detailed study of the spheres under the bright light demonstrates a system of inclusions, which is consisted of closely located, elegant, oblong crystals, that are much thinner than the silk fibers of the web.