Transcribe Notice of the Ward cabinets...the University of Rochester (1863)

Edit the transcription below

9.jpg

CABINET OF MINERALOGY                                                     9

2. CRYSTALLOGRAPHY; or the external form of crystals. 
A suite of large glass models of crystals, with faces framed
together, illustrate the Six Systems of Crystallization. They have 
within colored bars which define the two cardinal features of length 
of axes and angle of the same, and still further represent the 
included Fundamental forms.

Another suite of solid plate-glass models represent the Fundamental 
Forms, under which all natural crystals may be ranged. 
Three hundred and fifty large crystals in plaster of Paris, with 
colored primitive faces, give the more important secondary or derivative 
forms of minerals.

Some colored wooden crystals, which dissect, or take to pieces, 
illustrate the manner in which forms of one kind exist within 
another. Another series comprises about 30 models of Macles, or 
Twin Crystals.

A final suite contains 20 wooden models of crystals, composed 
each of two revolving pieces, showing the various Hemitropes
occurring among natural crystals.

(The above models are severally from London, Bohemia, Paris, 
and Germany.)

In this section are several score of natural crystals which accompany
the preceding models, and illustrate the same points.

The Crystallographic features of minerals are still further illustrated
by a series of Pseudomophous Crystals,- presenting forms 
foreign to the species to which the substance belongs. Here are 
Pseudomorphs by alteration, by replacement, by infiltration, and by 
incrustation.

A final and numerous series of specimens demonstrate the varieties 
of structure due to imperfect crystallization. These are 
arranged under the four heads of Columnar Structure, Lamellar 
Structure, Granular Structure, and Imitative Shapes- the latter, 
in particular, presenting many interesting and peculiar forms.

The specimens, both natural and artificial, in this Structural 
Series are of such nature as to be of the most signal importance to 
the student of the laws which regulate the growth and structure of 
minerals.

II. PHYSICAL SERIES.

Several hundred specimens arranged, in this series exhibit the 
characters of minerals dependent on Light, on Electricity and

Transcription formatting help

Current Page Transcription [edit] [view item]

                                  CABINET OF MINERALOGY                                                     9

2. CRYSTALLOGRAPHY; or the external form of crystals. A suite of large glass models of crystals, with faces framed together, illustrate the Six Systems of Crystallization. They have within colored bars which define the two cardinal features of length of axes and angle of the same, and still further represent the included Fundamental forms.

Another suite of solid plate-glass models represent the Fundamental Forms, under which all natural crystals may be ranged. Three hundred and fifty large crystals in plaster of Paris, with colored primitive faces, give the more important secondary or derivative forms of minerals.

Some colored wooden crystals, which dissect, or take to pieces, illustrate the manner in which forms of one kind exist within another. Another series comprises about 30 models of Macles, or Twin Crystals.

A final suite contains 20 wooden models of crystals, composed each of two revolving pieces, showing the various Hemitropes occurring among natural crystals.

(The above models are severally from London, Bohemia, Paris, and Germany.)

In this section are several score of natural crystals which accompany the preceding models, and illustrate the same points.

The Crystallographic features of minerals are still further illustrated by a series of Pseudomophous Crystals,- presenting forms foreign to the species to which the substance belongs. Here are Pseudomorphs by alteration, by replacement, by infiltration, and by incrustation.

A final and numerous series of specimens demonstrate the varieties of structure due to imperfect crystallization. These are arranged under the four heads of Columnar Structure, Lamellar Structure, Granular Structure, and Imitative Shapes- the latter, in particular, presenting many interesting and peculiar forms.

The specimens, both natural and artificial, in this Structural Series are of such nature as to be of the most signal importance to the student of the laws which regulate the growth and structure of minerals.

             II. PHYSICAL SERIES.

Several hundred specimens arranged, in this series exhibit the characters of minerals dependent on Light, on Electricity and