36 W. T. Repper qn some Minerals from New Jersey. 
, 
— to which 
among simple coefficients the forms 2-4 or 8-3 would answer. 
The — is too bee and dull to allow of a measurement of 
mtersection-edges, in which therefore n’ 
or laminze Pata a pale a light. " Strea k, aes. 
ish-reddish-gray. r is slightly attracted by the mag- 
net. BB. rather refractory, fusing at thin edges to a dull black 
On charcoal gives a zine coating, more distinctly on ad- 
dition of soda. With the — the usual reactions for silica, 
iron and manganese. 2 x and microcosmic bea ve 
in the O. F. the characteristic fester shal color, indicating 
ures of iron and manganese, which becomes green in the 
mixtu 
reducing flame. With acids gelatinizes scent and completely. 
Some specimens leave a ae Steen undissolved residue, which 
I judge to be spinel both from its hardness, its not being at- 
tacked by fusion with sole ‘and complete decomposition by 
bisulphate of soda. 
In the following analyses the silica was separated in the usual 
manner, the filtrate from the silica neutralized by carbonate of 
soda, then acidified with acetic acid and a current of sulphuret- 
ted hydrogen peers) through the solution, which separated the 
zinc as sulp is was filte off, redissolved in HCl 
and then preci Nivea from the uninterruptedly boiling solution 
by slowly adding NaC, and the Zn6 finally converted into Zn 
by ignition. The filtrate after the separation of the zinc was 
then boiled with the addition of 1KO,CI10, to sesquioxydize the 
iron, the iron p recip gape in the usual manner as subacetate, re- 
cautions pointed out by Dr. Dr Gils (this Journal, No. pest, p- 
216), ca the magnesia determined as pyrophosphate. e 
ie of iron, manganese and zinc-oxyds. 
ee not teva handled the aathod correctly. 2 
