Abstract
Abstract. The École des Mines de Saint-Étienne possesses an important collection of wooden and terracotta crystallographic models (several hundreds). During the 2000s, enhancement and rehabilitation action was undertaken. Several series of Krantz models were identified by the logos and linked to catalogs. The relation of these models to the important work of Paul Heinrich von Groth, in cooperation with the Krantz company, is highlighted. An exceptional element was discovered: a polyhedron with 170 facets, from the cubic system. After a short description of the model, we report on the digitalization work, followed by a description of two duplication methods: 3D printing and precision lost-wax vacuum casting.
Highlights
The École des Mines de Saint-Étienne owns a mineral collection with great patrimonial value
The École des Mines crystal model collection consists in total of more than 400 wooden elements, about 60 terracotta pieces and a series of 30 cardboard sheets
A copy of the model was made by precision foundry using the precision lost-wax vacuum casting technique at Solyfonte in Montbrison (France)
Summary
The École des Mines de Saint-Étienne owns a mineral collection with great patrimonial value. A working group was set up with competent mineralogists and a few volunteers to restore the entire collection During this effort, the crystallographic models were assessed; classified; and made accessible in a contemporary, user-friendly format. The crystallographic models were assessed; classified; and made accessible in a contemporary, user-friendly format They have been sorted according to the seven crystal systems. After a reminder of the history of the crystallographic models, we will give a short description of the ones in the collection of the École des Mines and an account of the way we have managed them and connected them with the old catalogs. The collection includes an element of exceptional quality by its large number of facets, its scientific interest and the technical prowess it represented at the time of its fabrication It is a piece of the cubic system with 170 facets and that bears the number 416. Our goal is to describe model 416 while providing some more general history on model collections, which are part of a revival in the world of interest in collections that has been taking place since the early 1990s (Johan Kjellman, personal communication, 2021)
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