EXPLANATION OF PLATE XLVTII. 



" Orthoclask. 



In this and succeeding ulates segments in twin position are lettered to coi-re- 

 spond with a normally jjlaced crystal turned through 180°. 



1. Adidaria habit. Cockburn Creek, near Tam worth. 



2. Baveno doublet. Oban. 



3. Baveno triplet or (as lettered) combined Baveno and Manebac-h 

 twin. Oban. 



4. Carlsbad twin. Oban. 



5. Manebacli twin. Bolivia. 



6. Carlsbad twin. Inverell. 



Forms:— f (001), a (lOO), 6 (OiO), in (110),-! (130), x lloi), «/ (201), » 

 (021), o iTll). 



