266 _ Scientific Intelligence. 
calcium. The carbonic acid was estimated by the loss of weight on 
treating a portion of the mineral with dilute acid, in a little bottle con- 
nected with a tube containing chlorid of calcium. The solid constitu. 
ents were determined by ordinary methods. The result was—in 100 
ss 
Magnesia, . , . ' . . . 57:86 
Protoxyd of iron, 5 : . ; , 2°84 
ili , ‘ ‘ ‘ ‘ 0:80 
ter, ‘ ° : . , ' “ 27°96 
Carbonic acid, . : 5 ‘ ‘ ‘ 10: 7 
99°4 
Considering the protoxyd of iron as replacing a little magnesia, the min- 
eral appears to be a combination of hydrate of magnesia and hydrated 
carbonate of magnesia. The formula | 
, 5 . HO+Meg0. CO,. HO 
20. 
will nearly express its constitution, and gives— 
Magnesia, : : ‘ : : 
' Water, 5 A ; : : : j 27:24 
Carbonic acid, . : : : : : 11:09 
100- 
The native hydrated carbonate of zinc (zinkbluthe) is a mineral of 
analogous constitution. ee 
2. Reclamation respecting the Identity of Pinite, Chlorophylhite, 
and other Minerals, with the species Iolite ; by CHARLES . 
ter has overlooked an article by myself, published in 1841, Vol. xli, p- 
ee of this Journal, entitled “* On two decomposed varieties of Iolite.” 
f Dr. Jackson. Mr. Haidinger appears also to have been unacquainte 
with the fact that the 2d edition of my T'reatise on Mineralogy, (Ne 
Haven, 1844,) refers, (p. 141,) not only both of the above varieties 
to Iolite, but likewise the Gigantolite, the Fahlunite, the Esmarkite, 
and another species may be formed as much as when pseudomorphous 
specular iron is derived from magnetic iron.*—Eps. 
what he claims is simply to have first pointed out the relation between the above 
mentioned substances (chlorophyllite, pinite, &c..) and iolite anulogous tor that 
which is admitted to exist between Rensselaerite and pyroxene, or the greenish fii? 
1 in -Mr. Ht 
2 
= 
Es 
. 
3 
5 
3 
& 
g 
3 
e 
& 
6 
35 
mis: 
3 
7 
me 
a 
45 
‘ties, possessing a coordinate natural history value with iolite itsell, Mr. 5 
by no means puts in a claim of priority as regards such labors.” 
