36 p. SCHEI. 



Together with that mineral and hkewise embedded in quartz 

 mainly, with little or no feldspar, occur crystals of titanite of a 

 type well known from alpine localities. 



The predominating forms are: |100|, }111|, )001|, lllOj ; re- 

 ferred to the axial ratio of Descloizeaux — Dana. Two different 

 types occur, the one represented by fig. 1 and characterised by 

 the forms llOOj, |110|, |llli & |001| and the other with jlOOj, 

 jlllj and jOOlj, see fig. 2. 1 is identical with the combination 

 figured by Hessenberg from Zillerthal, and 2 likewise with 

 V. Rath's Figur of crystal from St. Gotthard. 



Common to both is the constant twinning with tw-plane jlOOj, 

 no single individual being as yet observed; almost as constant 

 is the phenomenon that the faces of jlllj only form the ter- 

 mination ai one end, while jOOlj only is to be. found at the 

 other. In one specimen, however, a small face of jOOlj cuts 

 off the point of the arrow head. 



Narrow faces of jTuj are sometimes observed cutting the 

 edges between jllOj and 001, Besides these, in one specimen 

 are seen Toi together with Ti2 and ÏT2. 



The size is variable, mostly 30—50 mm. broad by 10 — 20 mm. 

 thick and 20—30 mm. high, the greatest crystal measuring 80, 

 50 and 30 mm. resp.; a broken mass of a yet greater crystal 

 has been obtained. 



The mineral from this locality is seldom found in unaltered 

 condition — in that case dark brown and strongly resembhng yttro- 

 titanite; usually it is altered through the whole mass to a light 

 grey substance, earthy-looking by weathering and containing 

 grains of: quartz, muscovite, epidote, chlorite, etc., dispersed in 

 the remaining titanite mass. 



Titanite from the West of Kammerfoselv. 



Of quite a different type are the crystals of titanite gathered 

 from a chloritic schist west of Kammerfoselv. 



