Eight solid glass models of crystal forms, for educational purpose. Frederick Krantz, Bonn, Germany 1900.

Germany beginning of 20th 1900 ca.

A rare german teaching set of Frederick Krantz glass crystallographic models representing the different shapes of the mineral crystals, for educational purpose. Internal silk threads materialize the crysallographic axes, in different colours. Cube (with yellow triangle inside) side length 12,5 cm (as reference for measures), all in great condition. These models are extremely rare, due to their specialist use and their fragility. Most of them still have traces of the paper label for their school inventory. Bonn, Germany circa 1900.

8” – 20 CM H 5” – 13 CM L 5” – 53 CM D

REF: V1701