There are found scattered up and down our Mineralogical and other literature, a great many names of Minerals which do not appear to have been satisfactorily determined, or of which very little is actually known.

Many of these minerals have been called Doubtful. The following list, I hope, will be inserted in the Magazine, so that the members of the Mineralogical Society and others interested may be able to supply more definite information concerning them.

Obviously, it is not my object to impugn the general accuracy of any of the authorities appearing in this long list; but the accumulation of the most reliable mineralogical data attainable, and the focusiug of it, so to speak, where it may be seen by anybody interested.