RECORDS. 651 



" It not rarely happens that in these flesh-red crystals there 

 appear dirty green portions exhibiting the twin-striation of 

 a triclinic variety. The feldspar is hard and brilliant, but is 

 nevertheless no longer intact ; under the glass the ciystals ap- 

 pear cavernous, lo per cent, or more of the substance being 

 gone." 2d. They are distributed through the interstices be- 

 tween the pebbles in still greater abundance, from 2 to 3 ciys- 

 tals appearing on a square centimeter of surface, with contrast 

 brought out by their bright cleavage-faces on fracture. These 

 crystals commonly enclose minute films and granules of gray 

 quartz, and sometimes particles of gray to white calcite, but 

 never any metallic copper. 



At the Portage Lake Mines in the cavities of the conglomerate, 

 the same bright red feldspar is commonly interspersed, often with 

 shining cleavage-faces on the fracture, but sometimes finely gran- 

 ular or dull and then approaching laumontite or other red 

 zeolite in appearance. They often vary from 5 to 10 mm. in 

 length and sometimes reach over 2 cm. 



Albany and Boston Mine. The red feldspar-rhombs vary in 

 dimensions from i to 4 cm., within the interstices between the 

 pebbles. Epidote is a common associate with analcite, phrenite, 

 quartz, chlorite, calcite and metallic copper. 



Huron Mine. The feldspar occurs as [in the preceding in 

 association with analcite, laumontite, epidote, calcite, quartz and 

 metallic copper. 



Osceola Mine. The feldspar occurs in very minute granules, 

 less than 0.5 mm. across, but occasionally in larger grains, 4 to 9 

 mm. in length. The same red rhombs also occur in the cavities 

 of the amygdaloid which overlies the conglomerate. 



Allouez Mine. Bright red shining rhombs of feldspar, up to 

 two or three mm. across, in the cavities of the conglomerate, as- 

 sociated with calcite, chalcotrichite, malachite and quartz. 



Peninsula Mine. The coarse conglomerate contains the same 

 red feldspar in rather inconspicuous grains, mixed with calcite 

 and metallic copper. Occasional pebbles occur, up to 1.5 cm. 

 in length, chiefly made up of the same feldspar in aggregates of 

 shining grains, i to 1.5 mm. across, mixed with granules of gray 

 quartz. 



