300 > Analysis of the Melanite. 
Arr. XXIV.—Analysis of the Melanite, from Franklin 
Furnace, Sussex Co. New Jersey, by Henry SeyBERT.— 
Turs mineral so nearly resembles the Melanite of Fras- 
cati, near Rome, that a description of it is deemed unne- 
cessary. 
Analysis. 
A. 3 grammes of the mineral by calcination at ared heat, 
diminished in weight 0.01 grs. hence we have 0.333 per 
100 of moisture. 
B. 3 grammes finely pulverized were boiled in concen- 
trated muriatic acid, the solution was reddish brown, the 
insoluble portion became colourless and gelatinous, the 
mixture was evaporated to drive off the greater part of the 
excess of acid, water was then added and the solution was 
filtered, the Silica remaining on the filter, after calcination 
weighed 1.06 grammes, or 35.333 per 100. 
C. A portion of the liquor (B) waich was ofa lemon 
yellow colour, was decomposed with an excess of subcar- 
bonate of ammonia ; the supernatant liquor was decanted 
from the precipitate and tested with phosphate of soda and 
ammonia, but no magnesia was present: ‘The precipitate 
was redissolved, and the solution after ebullition was added 
to the preceding liquor, it was decomposed with an excess 
of caustic ammonia, the reddish brown precipitate after 
calcination weighed 1.03 grs._ It was calcined with caustic 
potash, the green colour of the solution in water indicated 
a trace of manganese—afterall the alumina was separated, 
the peroxide of iron weighed 0.90 ers. or 30.00 per 100. 
The alumina estimated by difference amounts to 0.13 
grs. or 4.333 per 100. 
D. The lime was precipitated from the liquor (C) with 
oxalate of potash ; the oxalate strongly calcined gave 0.84 
crammes of lime, or 28.00 per 100. — 
‘Tne constituents of the Melanite of Franklin are, per 
100 parts, : 
A. Volatile matter, 0.333 containing oxygen 
B. Silica, - BBS): |... ~pikesae tee oa 
C. Peroxide of Iron, 30.000 - - ~ BH) Wes al hss 
