286 A. HL. Chester— Mineralogical Notes. 
2. PINK CELESTITE. 
The occurrence of celestite, in connection with strontianite, 
in the rocks of the Clinton group, has received casual notice by 
Professor O. Root,* and it has also been noticed since in vari- 
ous lists of mineral localities. It occurs in nodules and geodes, 
not only in the limestone and sandstone beds, but also in the 
odlitic iron ore beds of this vicinity. The best examples are 
to be found at the stone quarries near Lairdsville, about two 
miles west of Hamilton College, where it occurs abundantly in 
masses made up of prismatic crystals, sometimes so slender as 
to give a fibrous appearance to the specimens. In rare in- 
stances the crystals are bladed, and radiate from a center in 
fan-like shapes. These specimens are often coated with stron- 
tianite, which is generally of a mealy character, though some- 
times in small crystals. The peculiarity of this celestite 
which makes it most interesting is its color, which is usually a 
delicate pink or flesh color, though sometimes it has the ordin- 
ary dull bluish tint. Occasionally both colors are seen on the 
same specimen, but more often it is distinctly one or the 
other. 
An analysist of this celestite gave the following results: 
Rone Peube eae is Saar a cy ane Medes kk 46°71 per cent. 
IBA QI! HAC AV sole nde ake eet ees FREY FS 
Ga Ose sees eon ne we au en is 2°01 ss 
KO Naa Slice ase dns ede A 43:20 «& 
ILO SiR e a NO ee cette Ossian 
otal eile oa te tonal 100°38 
This corresponds to the following proportions of the three 
sulphates : 
OES Oy ai Me AE CS ah ee oe 84:09 
BasOr eV CW ae Oe Une ee 11:05 
CaSO) he Nene Ue eae 4:86 
The mineral has frequently been called baryto-celestite, 
though as far as I can find there is no published analysis of it. 
From the above calculation the ratio of S,SO,: BaSO, : CaSO, is 
about 10: 1:1, but the mineral is undoubtedly a mere mixture 
of the three nearly isomorphous sulphates. A similar mixture, 
but without the CaSO, is described by Collie,{ from Clifton, 
near Bristol, England, who gives a number of analyses of 
celestite containing barium sulphate in varying proportions and 
* This Journal, I, vol. xiii, p. 264. + By Mr. F. I. Cairns. 
t Min. Mag., li, p. 220. 
