_To the Editor of the American Journal of Science, &c._ NEW-YORK, Dec. 21, 1818. DEAR SIR, It is desirable that some mode should be adopted by which the public may become acquainted with all the _New American Localities of Minerals_, as they are discovered from time to time. With deference I would suggest, that in each number of your Scientific Journal, new localities might be recorded in alphabetical order, for present information and future reference. The following localities, which have come under my observation, and which are probably not noticed in any work, are at your service. 1. _Agate._ Rolled mass: occurred near Powles Hook, New-Jersey. 2. _Apatite._ Truncated crystals of one inch, and amorphous; occurs in granite, chiefly in the felspar. Corlaer's Hook, vicinity of New-York. 3. _Brown Mammillary Hematite_, covering quartz crystals. Perkiomen lead-mine. Montgomery county, Pennsylvania. 4. _Carbonate of Magnesia._ Structure earthy. Apparently a _pure_ carbonate of magnesia. In mica slate, and granite; chiefly in the quartz. Roxborough, Philadelphia county. 5. _Common Jasper._ Traversed by veins of semi-opal. Small detached masses, frequently waterworn. Rhinebeck, Dutchess county, New-York. 6. _Compact Malachite._ Perkiomen lead-mine. 7. _Fetid Carbonate of Lime._ In ridges; and strata nearly vertical, sometimes containing petrifactions. Very frequent in Dutchess county, particularly in the neighbourhood of Rhinebeck Flats, and near Hyde Park. 8. _Fibrous Talc._ In granite. Roxborough. 9. _Graphic Granite._ North River, near the city of New-York. 10. _Graphite._ In a calcareo-siliceous gangue. Corlear's Hook. 11. _Native pulverulent_ (or rather granular) _Sulphur_. In pyritical quartz. Barren Hill, Montgomery county, Pennsylvania. 12. _Plumose Asbestus._ Corlaer's Hook. 13. _Semi-opal._ In common Jasper--(which see.) 14. _Scaly Talc._ In granite. Roxborough. 15. _Stellated Quartz._ Perkiomen lead-mine. 16. _Sulphate of Barytes._ In sulphuret of lead and silver. Livingston's lead-mine, Columbia county, New-York. 17. _Sulphuret of Silver._ With sulphuret of lead. Same locality. 18. _Tourmalin._ In masses of crystalline quartz. Rhinebeck. Very respectfully, F. C. SCHAEFFER. * * * * * The following notices were prepared before the receipt of the above letter. _Other Localities of Minerals and of_ ANIMAL REMAINS, _and acknowledgments of Specimens received_. _Guadeloupe._--Native sulphur, obsidian, pitchstone, native alum, basaltic hornblende, alum covered with sulphur. _Porto Rico._--Hexagonal crystals of mica. Specimens of the above minerals are in the cabinet of Mr. John P. Brace, at Litchfield, Connecticut.