'234 Miscellaneous Notices in Mineralogy, Geology, &fc. 



some quartz crystals (among other minerals which we may 

 notice on a future occasion) from Dr. Porter of Plainfieldj 

 Mass. which for their perfect transparency equal any thing, 

 of the kind, that we have ever seen ; they do not exceed one 

 fourth or one third of an inch in diameter, and the largest 

 that has been obtained is only three fourths. 



8. Agaric Mineral. 



Professor Hall in a letter to the editor, states, that a sub- 

 stance found in Vermont, and there called chalk, effervesces 

 with nitric acid in precisely the same manner that English 

 chalk does ; it answers all the purposes to which Spanish 

 white is applied, and is used in making putty; and is from 

 the Lyndon, Caledonia County, where it exists in inexhaus- 

 table quantities. The specimen transmitted by Prof. Hall, 

 corresponds with his description, and has every appear- 

 ance, as he intimates, of a disintegrated carbonat of hme, 

 whose minutely divided parts have been feebly reagglutina- 

 ted. It so strongly resembles agaric mineral that we have 

 ventured to give it that name. 



9. Marhles of Kentucky. 



We have received from Mr. Joseph W. Edmiston, hand- 

 some specimens of compact marbles from Kentucky — they 

 are stated to be from the counties of Clark, Jessamine and 

 Woodward. Their colours are yellow, smoke and ash grey 

 and they are considerably variegated by darker clouds. — 

 Being from a secondary country, their structure is wholly 

 compact, and they are, most remarkably different from the 

 highly crystalized marbles of the primitive countries. 



10. Fetid Crystalized Limestone. 



We formerly mentioned a fetid crystahzed limestone 

 transmitted by Prof. Dewey. Mr. Samuel Morey of Ox- 

 ford, New-Hampshire, has transmitted another, which al- 

 though fetid by friction and percussion is very distinctly 

 crystalized and its colour greyish white. It is from the vi- 

 cinity of Oxford, from a quartz mountain in a country high- 

 ly primitive. 



