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Early Crystal Models


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Wooden model illustrating Haüy's laws of decrement on the edges
France, early 19th century (height 5.5 cm)

The model represents Haüy's theory of how the dodecahedron with pentagonal faces (pyritohedron) is constructed from a cubic nucleus by decrement of two rows of "integrant cubic molecules" of each newly added layer on two opposite edges combined with a decrement of only one row of molecules on every two successive layers on the other two edges. This combination takes place in three perpendicular directions.
The model whose edges show 17 cubic "molecules" fits exactly the illustration in the atlas of Haüy's "Traité De Minéralogie" (1801).


pyritohedron


Wooden model illustrating Haüy's laws of decrement on the edges and vertices
France, early 19th century (height 7 cm)

The model illustrates a complex differential decrement of cubic "molecules" on the edges AND on the vertices. It results from a combination of Haüy's laws giving the octahedron starting from the cube combined with that giving the pyritohedron and exemplifies crystal forms of pyrite ("sulfure de fer icosaŤdre" of HaŁy).
HaŁy R.J. Annales de Chimie, 17, 225-319 (1793).



Wooden model illustrating Haüy's laws of decrement


P. Groth & F. Krantz collection (1880)
Wooden crystal models (ca. 3.5 to 5.5 cm) from the P. Groth & F. Krantz collection (1880)

6 silver- and/or gold-containing minerals. From left to right:
top row: stephanite (392), krennerite (394), hessite (47)
bottom row: sylvanite (533), proustite (215) and freislebenite (539).





F. Krantz glass crystal model (ca. 1900?)
Glass model of a monoclinic crystal (ca. 20 cm) from a series.
A small glued label indicates: "I | Dr. F. Krantz | Bonn a. Rh."

Internal silk threads materialize the crystallographic axes and illustrate with the corresponding colours the dispersion of the optic axes and of the acute bisectrix for blue, yellow and red light.



F. Krantz glass crystal model (ca. 1900?)


F. Krantz wooden crystal model of an hexoctahedron
Large (16,5 cm high) hollow wooden model of an hexoctahedron {321} stamped "7" from a series of 30. Large models of this type (15-25 cm) were furnished for demonstration purposes. Two slightly different sets are described in the second and third editions of Krantz’s catalogue n° 18. First half 20th century.



F. Krantz wooden crystal model of an hexoctahedron


P. Groth & F. Krantz collection (1880)
5 rotatable wooden models of twin crystals (ca. 5.5 to 7.5 cm) from the P. Groth & F. Krantz collection (1880)
From left to right:
top row: gypsum (564), lazulite (589)
center: trydymite (711)
bottom row: titanite (702), calcite (307)

P. Groth & F. Krantz collection (1880)


Porcelain crystal models (ca. 1841)
Collection of 24 cream colored biscuit porcelain crystal models (size ranging from 3 to 10 cm) in contemporary (but probably not original) mahogany case. Each has faces stamped P, M and T and most models are identified in manuscript on paper labels.
The models are not signed, but the material they are made of and the stamped letters P, M, T are typical for models made by John Joseph Griffin (ca. 1841)

Porcelain crystal models


Colored glass crystal models
24 colored glass crystal models (size ranging from 1.5 to 5 cm) in chamois-leather and plush lined leather covered case (36.5 x 22.2 x 5 cm).
Unsigned, first half 20th century.




Colored glass crystal models


Colored glass crystal models
20 colored glass crystal models (size ranging from 1.5 to 3.1 cm) in chamois-leather lined, plush soft fabric covered inner lid. Faux leather case (21.5 x 15.5 x 3.2 cm).
Unsigned, likely Czechoslovakia, late 19th early 20th century.



Colored glass crystal models


F. Krantz glass crystal model
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".
Both models, first half 20th century.

F. Krantz glass crystal model


F. Krantz cardboard crystal model
Cardboard model (25 x 10 cm) of a tourmaline crystal from a series of 60. These models were offered varnished to prevent damage.
A small glued label indicates: "25 | Dr. F. Krantz | Bonn a. Rh.", first half 20th century.

Krantz cardboard crystal model


Set of Bakelite crystal models
unsigned set of 14 black models with white edges. Dimensions of the models are given below each photograph
First half 20th century.
Bakelite crystal models


19th century glass and wire model
Glass cube, edge 66 mm. Inside the cube, 9 cubic crystal forms delineated by colored wires are present; three 6-faced, five 24-faced and one 48-faced models. The model comes in a red plush lined mahogany case.
The maker is unknown.



19th century glass and wire model


Case with wooden crystal models
Collection of 36 maple and fruit wood crystal- and geometric models (size ranging from 3 to 4 cm) in paper covered wooden case (22.5 x 19 x 6 cm). The sliding lid of the case is covered with a colored lithograph depicting a teacher with two students studying a collection of crystal models. Text on the lithograph "Krijstallographie. | Crystallographie, Crystallography". The box also contains a paper (41.7 x 33.8 cm, folded twice to fit in the case) with 8 unfoldings to make paper crystal models.
Ca. 1860.

Case with wooden crystal models


Wooden models of twinned feldspar crystals
18 rotatable wooden models of twinned feldspar crystals (all ~2.7 x 2.2 cm) with face symbols in brown ink  in a grayish paper covered cardboard box (19.5 x 10.1 x 1.6 cm).
G.E. Kayser, Berlin, 1834.
On the occasion of his inauguration in 1834, Gustaf Eduard Kayser (1803-?) presented this set of wooden crystals to Christian Samuel Weiss (1780-1856) who was professor at the University of Berlin.



Wooden models of twinned feldspar crystals


Case with wooden crystal models
15 wooden crystal models (average size 5 cm) in wooden case (34 x 25 x 6 cm). Each crystal model bears a number that corresponds to a printed list on the inside of the lid.
Unsigned, mid 20th century.



Case with wooden crystal models


Wooden crystal models from Germany or Austria
A collection of 135 (some duplicates) wooden crystal models - 6 with movable parts - used for teaching purposes during 20th century: 66 models are mounted on black painted wooden bases (47 with their original labels) while 69 models are unmounted; maximum height of the models including the base: 9 cm
82 loose wooden bases (most of them with a label) are also present. The back of two detached labels bears "K. K. Staatsgymnasium Wien I."
End 19th century

wooden crystal models