362 PROP. T. G. BONNEY ON THE GARl^ET-ACTINOLITE [Aug. 1 898, 



(2) Garnets are frequently present, but are usually less abundant 

 in the more hornblendic varieties. The larger specimens 

 generally occur where biotite is the more abundant ferro- 

 magnesian mineral, though occasionally fine crystals may|be 

 found associated with bunches of long slender actinolites. 



Pig. 2.— -Bunches of actinolite on a block, the principal group sketched 

 being about 5| inches from end to end, and about as thick as a 

 stout pin or slender bodkin. {Loose block, from cliffs north of 

 Lago Tom.) 



Fig. 3. — Rough sketch of tuft 

 of hornblende-crystals : about 

 2 inches long, top hid. by 

 debris. {Loose block., at open- 

 ing of Val Canaria.) 



(3) The actinolite ^ appears to be longest and best developed on the 

 planes of cleavage-foliation, 

 but it can be also found 

 piercing the rock at all 

 angles. Sometimes it assumes, 

 instead of the ' bodkin ' shape, 

 a rather broad-bladed form, 

 nearly ^ inch in diameter, 

 with ' frayed ' ends. The 

 actinolite is not restricted to 

 one variety of rock or asso- 

 ciated always with garnet. 

 For instance, I have found it 

 in the usual silvery schist 

 (with abundant paragonite and 

 some biotite), in a pale greenish 

 schist (colonred probably by 

 chlorite or by minute horn- 

 blende), in a gneissose rock, 

 somewhat resembling a fine- 

 grained granite, and in a 

 darkish massive rock ob- 

 viously rich in hornblende. 



Garnets also may occur in 

 any of these. They range commonly from the size of a large 

 pea downwards, but occasionally run up to nearly an inch in 



^ See figs. 2, 3, & 4 in illustration of these remarks. 



