Krantz glass crystal models
Glass models of a hexagonal and tetragonal crystal from
a series. The height of the hexagonal prism is 14.8 cm,
the height of the tetragonal bipyramid is 20.2 cm.
Internal silk threads materialize the crystallographic
axes; red for the c-axis, yellow for the other axes.
On the tetragonal crystal model a small glued label indicates: "16 | Dr. F. Krantz | Bonn
a. Rh." On the hexagonal crystal there is a similar label indicating: "10 | Dr. F. Krantz | Bonn
a. Rh.", and another gilded label with the Krantz logo and the text "Dr. F. Krantz | Bonn am Rhein".
first half 20th century.
Collection: private collection