White. —Petrography of the Boston Basin. 
PLATE 3. 
Fig. 10. Glaucophane crystals. From 10th census slide 25,609 of hornblende 
granite of Hardwick quarry, Quincy, X 144. 
Fig. 11. Hornblende granite, Rattlesnake Hill, showing Carlsbad twin, con¬ 
taining several glaucophane crystals. Slide 72a, X 144. 
