The minerals are, with a few exceptions, described under the same classification and in the same serial order as in Dana’s "System of mineralogy", 6th edition, 1892. For each the order of treatment is, in general, first, crystallography, including both facts previously noted by other authors and new observations, if any, made in the course of this investigation; second, physical and optical properties, including the latest data attainable; third, composition, with tabular chemical analyses and for some species a discussion of the chemical formula; fourth, occurrence at Franklin added Sterling Hill; and lastly, for the more important species, notes on the history of the minerals as known at Franklin.

This paper contains descriptions of 148 minerals, many of which, of course, are of slight importance and require but brief notes. Minerals seen only as essential constituents of the local rocks are not included. Many species already known elsewhere were added to the list of those found in the district, and 18 new species were discovered and described in the course of this investigation. Much new information on the crystallography, optical constants, and composition of the already known minerals was acquired during the course of the work, and more important data of the sort have already been published in scientific periodicals (see especially 195, 251, 257, and 273).

In the table below all the species and varieties of minerals that have been definitely identified in the district and described in this paper are listed in alphabetical order.

**Alphabetical list of minerals described**
(Names in italic are those of varieties; names followed by (v) are those of species represented by more than one variety or only by an uncommon variety.)
Actinolite		Hydrozincite
Albite
Allactite		Ilmenite
Allanite
Amphibole (v)		Jeffersonite
Andradite
Anglesite		Kentrolite
Anhydrite
Anorthite		Larsenite
Apatite		Lead
Apophyllite		Leucaugite
Aragonite		Leucophoenicite
Arseniosiderite		Limonite
Arsenopyrite		Lollingite
Aurichalcite		Loseyite
Axinite (v)
Azurite		Magnesium chlorophoenicite
		Magnetite
Barite		Malachite
Barylite		Manganbrucite
Barysilite		Manganite
Bementite		Manganoaxinite
Beryllium vesuvianite		Manganophyllite
Biotite (v)		Manganosite
Bornite		Marcasite
Brucite (v)		Margarosanite
Bustamite		Mcgovernite
		Microcline
Cahnite		Millerite
Calamine		Molybdenite
Calciothomsonite		Mooreite (v)
Calcite		delta-Mooreite
Calcium Larsenite		Muscovite
Celestite
Cerusite		Nasonite
Chalcocite		Neotocite
Chalcophanite		Niccolite
Chalcopyrite		Norbergite
Chlorite
Chlorophoenicite		Pargasite
Chondrodite		Pectolite
Clinohedrite		Phlogopite
Copper		Prehnite
Corundum		Psilomelane
Crocidolite		Pyrite
Cummingtonite (v)		Pyrochroite
Cuprite		Pyroxene (v)
Cuspidine		Pyrrhotite
Cyprine
		Quartz
Datolite
Desaulesite		Rhodochrosite
Descloizite		Rhodonite (v)
Diopside		Roeblingite
Dolomite		Roepperite
		Rutile
Edenite
Epidote		Scapolite
		Schallerite
Ferroaxinite		Schefferite
Ferroschallerite		Serpentine
Fluoborite		Siderite
Fluorite		Silver
Fowlerite		Smithsonite
Franklinite		Sphalerite
Friedelite		Spinel
		Stilbite
Gageite		Sussexite
Gahnite		Svabite
Galena
Ganophyllite		Talc
Garnet (Fe)		Tennantite
Glaucochroite		Tephroite
Goethite		Thomsonite (v)
Graphite		Thorite
Greenockite		Titanite
Gypsum		Tourmaline
		Tremolite
Halloysite
Hancockite		Vesuvianite (v)
Hardystonite
Hastingsite		Willemite
Hedyphane
Hematite		Xonotlite
Hetaerolite
Heulandite		Zincite
Hodgkinsonite		Zinc cummingtonite
Holdenite		Zinc schefferite
Hyalophane		Zircon
Hydrohetaerolite		Zoisite


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