Angular Values : Afeasured : Calculated : 



«: i = (100):(010) = *82° 5 — 



(:>:c- = (010): (U01) = *75 52 

 (e:c = (100) : (00l)z==*77 53 — 



o: 6 =z(Tl3):(010) = *66 5Ü — 



c -.r =(001):(101) = *39 37 — 



a: r =(100): (101) = 38 23 38°1()' 



:c =(Tl3) :(001) = 21 39 21 7 



:a =(Tl3) : (100) == 84 4(3 84 42 



c' :;9 = (OOT) : (032) = 50 38 50 49i 



No distinct cleavage could be stated. 



On all faces the extinction-angles are otiier than rectangles ; the 

 crystals have a sherry-like colour, and are not distinctly dichroitic. 



IV. Laerogjiintovij Ltiteo- Trlethi/leniidiainine-CobaUihroiiwIi'. 

 Formula: \Co [Aeia)^\ Br, -\-2H,0. 



Big, brownish-red, commonly rhombic dodecahedrically shaped, 

 very lustrous crystals, which make very accurate measurements 

 possible. 



Ditetragonal-hipyramidnl . 

 n:c = \: 0.8399. 

 Observed Forms: ;/(=r:jllÜj, usually as largely developed as o, 

 giving the crystals thereby the aspect of rhouihicdodecahedrons 

 (fig. 5) ; sometimes however in is strongly predominaut cither with 

 ail its faces or with two parallel ones only, in sucii a way that the 

 crystals get a column-shaped or tabular aspect. Further: o = \iO\\, 

 big and lustrous; rarely: w=:|2ÜJj, small but very easily measu- 

 rable. The faces of jllOj sometimes give multiple images. 



Angular Valufx : Ohai'rved: Calculated: 



-.0 = (101) : (Oil) =*54° 6' — 



o :m = (101):(110)= 02 55 (52°57' 



o :o --(101): (101)= 80 7 80* 3^ 



(o:o =(201):(101) = 19 8 19 12-1- ¥i^. 'o. 



CO : m = (201) : (1 1 0) = 52 30 52 35 Laevogyratory Luteo- 



baltibromide. 



No distinct cleavage was found. 



