480 University Geological Survey of Kansas. 
Ay eat) (Be yf BAIR? S 1B, LIBS [oo], S IK SHE IRS 2M (Sy IR). 
Medium-sized crystals of an amber color (fig. 40) with 
crystals of pyrite as inclusions arranged parallel to the faces 
of the crystal and studded over the surface, the latter occa- 
sionally in stalactitic groups. Very frequently the pyrite is 
on the surface of the lower part of the crystal, while in the 
upper part it is present as inclusions. Obtained in a cave at 
the Nickel Plate mine, one and one-half miles east of Aurora. 
Thanks are due Supt. F. H. Brinkerhoff and Mr. J. H. Roby, 
who kindly allowed access to the cave. The low scalenohe- 
dron, w:, is usually the dominant form, but occasionally the 
unit rhombohedron p- takes its place. Measurements as fol- 
lows serve to identify the forms: 
Crystau. | Angle. meastre Average. Calculated. 
No. 1./P.am. | 1011,4041 4 31° 49’ 31° 103’ 
WO de | Palo | LONI ALON 3 45 0 45 234 
No. 1. | K:,K” | 3131,3121 2 35 524 35 36 
No. 2. | K:,jK:™} 2131,3211 2 46 50 47 1k 
No. 3. | w:aw:” | 3145,4135 2 1B) 1G" © 
No. 3. | w:aw:! | 3145,3415 | 1 51 30 49 23 
No. 4. | w:nw:” | 314574135 il 15 80 1G. © 
No. 4. 2 
w:vw? | 3145,3415 | 49 0 49 23 
Type 7. P-,+R; e: +$R3; K:,+R*; F:,+R3; m-,+4k; 
n-,+oR; ¢.,—2R; 7.,—4R;??. 
Clear, colorless crystals of medium size, often flattened 
parallel to the p- faces; from the Elizabeth mine east of 
Leadville hollow, Joplin. Figure 41 represents a typical 
crystal. The faces of the unit rhombohedron p- are dull, and 
on their surface may be seen the etch-pits described in the 
list of the forms. e: appears as bright faces though striated 
in the direction of its longer or acute polar edges. K: has 
its usual appearance, and is marked by indistinct growth fig- 
ures and etch-pits. F: is very dull, with indentations of 
irregular form, and is in oscillatory combination with p-. m- 
