Abstract
A portable training kit for constructing crystal structures by students themselves was prepared as an experimental educational tool for learning in and outside of class. The training kit mainly consisted of a round-hole-punched mesh aluminum plate and glass bolls (15 mm dia.) for closest packing structures. Plastic balls with different diameter (3 mm and 6 mm dia.) were added in the training kit for placing in the tetrahedral and octahedral holes, respectively. From comparing with the questionnaires for the student evaluation of the lectures with and without using the training kit, it was inferred that the training kit would be effective for the improvement of a positive attitude toward the lecture and of understanding of crystal structures for the students.
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