Mineralogy of Orange County, N.Y. 333 
bars to the depth of four or five feet, but were unable to perceive 
any thing but fine soil. The side walls consisted of solid Limestone, 
free from minerals, and gradually sloping on both sides towards the 
middle of the trough. They obtained on this occasion a very fine 
supply, not only of the Sapphire but of the other minerals found in 
connexion with it. Dr. Young mentions a single crystal of Sapphire 
in his possession, that weighs five ounces avoirdupois. He also al- 
ludes to crystals of the supposed Idocrase in six-sided prisms with 
trihedral terminations at both extremities,—a form which would seem 
to indicate that this substance is rather Garnet than Idocrase, as has 
been believed. It is possible, indeed, that both substances occur 
there ; though all the specimens I have seen from the spot have uni- 
formly consisted of large foliated masses, having three polished planes 
inclining to one another under angles of 120°, which goes to strength- 
en the opinion I have here ventured to suggest. 
Concerning the minerals of Franklin and Stirling, scarcely any thing 
remains to be said after their full description in the various papers 
alluded to, at the commencement of this article. ‘The mineral for- 
merly called manganesian Feldspar, crystallized siliceous oxide of . 
Manganese, and Ferro-silicate of Manganese, has very happily been 
endowed with the trivial name of Fowlerite ; a change which will 
undoubtedly be readily acquiesced in by mineralogists, no less on 
account of the greater convenience of a short name, than the propri- 
ety of calling so interesting a substance after Dr. Fowler, of Frank- 
lin, to whose zeal in mineralogy the cultivators of this science are so 
Much indebted. The crystallization, hardness and specific gravity 
of the Fowlerite bring it under Mohs’ natural order Baryte, and pro- 
bably within the genus Parachrose-Baryte. 
he Stirling mineral, formerly known as a silicate of Zine, and 
since ascertained by Dr. Thomson, to be a Ferruginous silicate of 
Manganese, has been found of late in distinct crystals. ‘These are 
a form which justifies the opinion originally entertained by Dr. 
Troost concerning their primary form, which he suggested to be that 
“acube. Mr. Ingliss, of Hamburg, has an isolated crystal of this 
Substance, upwards of an inch in length ; its form is that of a rhombic 
decahedron with its acute solid angles replaced by tangent planes. 
Its hardness is a little below that of feldspar, and its specific gravi- 
Y and form approximate it to the Genus Garnet, among whose spe- 
“les it will probably receive a place in the Natural History system. 
en freshly broken, it presents an asparagus green color: ona 
