476 University Geological Survey of Kansas. 
DESCRIPTION OF TYPES. 
Farrington, in the publication previously referred to, di- 
vided the calcite crystals observed by him into five types. 
These are accepted by the author and nineteen more types 
are added, being designated by the numbers 6 to 24. As in 
other classifications, there is no hard-and-fast line separating 
the various types, for they intergrade more or less. Some 
crystals may with equal propriety be included under two or 
more different types. 
Farrington has fully described types 1 to 5in his paper. 
The following notes are based upon material studied by the 
writer, except type 5, which was not found by him. Most of 
this information concerning the first five types is contained in 
Farrington’s paper, though some new observations are made. 
Several undetermined forms occur. These belong to faces 
which are either too small to be determined by the contact 
goniometer, or too dull or too striated to be determined by the 
reflection goniometer. However, it is thought that they 
deserve a place in the description, and are accordingly desig- 
nated by certain characters. Thus, +? stands for an unde- 
termined positive rhombohedron; —? for a negative one; 
while ?? is an undetermined scalenohedron. 
Maan Ib (develo |) ICS, IES 8. ceeds? s (So, Hs), 
Farrington describes the crystals of this type as delicate 
violet to wine-yellow crystals from the Blaikie No. 2 mine. 
The writer has also noted them from the Blackberry mine, 
which is situated a short distance from the Blaikie No. 2. 
The faces of the crystals are smooth and bright, showing no 
etching or other deformation. Figure 34 (after Farrington ) 
exhibits the typical development of this form. Measure- 
ments on these crystals with the contact goniometer are as 
follows: 
No. of 
CRYSTAL. Angle. measure- Average. Calculated. 
ments. 
— SS | ee) | eee | LC | | 
INO. Th | eyties | DIBA pBsila 1 ABO (yy | al© Eis) 
Now ts teva | e2iisaynood 1 nL 0 20 364 
No. 2. | t:atz! | 21384,23814 1 AX 30 41 55 
IN@; % |) teais? | BIB ASlBel 1 2ile20 20 364 
