128 On the Chemical Composition of Wernerite, 
4. Compact Scapolite from Arendal. — Pale yellowish 
green. Density 2°751. Gave off a bituminous smell when 
heated. Analysis gave :— 
I ae Fete 
Silica, . ; . 45:05 23 45°05 
Alumina, 27-94 25°40 25°31 
Peroxide of Iron, 2°02 2:02 
Lime, . : . ‘EEGy 16:93 17°30 
Magnesia, . .» ee 0:29 0-30 
Potash, . ; : ee 1°55 1 55 
Soda, . ; : Ne 6°45 6°45 
Volatile substance, . 1:24 1:24 1°24. 
99-22 
The quantities of oxygen are :— 
Silica, . : ; 23°38 4 
Alumina, it BGS x ; 
Peroxide of Iron, . 0°61 } ea —_ 
Lime, . : . ., 4562 
Magnesia, . > ES ‘ae 
Potash, Or OG Ph tg 
Soda, . ; Jt tall 
5. Nuttalite, from Boston, Massachusetts —Grayish-black 
erystals. Density 2:748. Analysis gave :— 
i jg Il. 0. ‘it. 
Silica, . Rage yy) =a 5 45°57 
Alumina, } 27-47 23:91 23°38 23°65 
Peroxide of Iron, 3°59 3°17 3°38 
Lime, . : > a" OG 20.64 21:14 20°81 
Magnesia, . i 1:31 1°72 112 1:33 
Potash, : $ e- fe 0°63 0:63 
Soda, . : ; ben ot 2:46 2-46 
Water, , 7 Os 0:78 0-78 0:78 
98°51 
The analyses I. and I]l.a.refer to exactly the same material, 
IL. b. to very carefully selected fragments. 
The quantities of oxygen are :— 
Silica, . : 23°76 4 
Alumina, : .) SO206 
Peroxide of Iron, . ree See otal 
