and its associates on Lake Superior. 189 
same age as the sandstone beds, which are comformably super- 
5 egg over the trappean series on the west side of Keweenaw 
oint. 
hanging wall 
. 
to this brown and dirty red. Light and dark green, mottled or 
speckled with brown ; dirty brownish-green; reddish-gray ; and 
ark green, almost black, are the usual colors. 
The fracture is enerally uneven, or hackly, to imperfectly 
Conchoidal, but in the freshest, and especially in the compact 
Varieties, it is often highly conchoidal. They have an earthy 
odor often even without having been breathed upon. | 
Ms Magnet, while others contain very little of this mineral. 
parently labradori 
£ 
f a ¥ 
ferent shades of green, while the magnet reveals a very varia- 
ble percentage of a magnetic iron; and in some of the coarser- 
