346 Gibbs on Tourmalines, &c. 
After seeing the notice of the crystals found at Hudson by 
Mr. Schaeffer, I wrote to a member of the Lyspam of Natural 
History, New-York, a rather more full account than the 
above, of my crystal, &. I hope to ascertain, whether the 
liquid will congeal at 10° or 20° below 0, but have some fear 
lest the crystal should be injured. es 
: C. D. 
=; 
ae 
Art. IV. On the Tourmalines and other Minerals found at Ches- 
terfield and Goshen, Massachusetts, by Col. Gzorce Gress. 
(For the American Journal of Science.) 
Ti schorl of the mineralogists of the last century united a 
variety of substances which subsequent observations have 
into seyeral species. The green schorl is now the 
epidote, or the Vesuvian, or the actynolite. The violet schorl 
and the lenticular schorl, are the axinite. The black volcanic 
schorl is the augite. The white Vesuvian schorl is the sommite. 
The white grenatiform is the leucite. The white prismatic 
is the pycnite, a species of the topaz, and another is a variety 
of feldspar. Of the blue schorl, one variety is the oxyd of tita- 
nee another the sappare, and another the phosphate of 
e schorl cruciform is the granatite. The octahedral 
ae is the octahedrite, or anatase. 'The red schorl of Hun- 
gary, and the purple of Madagascar, are varieties of the oxyd 
of titanium. The spathique schorl is the spodumene. 
The black schorl, and the electric schorl, only remained, and 
to avoid the confusion created by the use of the term schorl, 
name of tourmaline was given to this species by that cele- 
brated mineralogist, the Abbé Haiiy.* 
* If this memoir should ever meet the eye of this amiable man, I trust he will 
excuse the notice to which his labors so justly entitle him. To him we are e in- 
es fora — science of SS erephy, and for ‘having spn ene the 
chemists 
