Occurrence
At Franklin garnet was one of the most abundant minerals found in the pegmatite contact zones in parts of the ore body. Great masses of yellow, green, or brown massive garnet, mingled with biotite, franklinite, rhodonite, calcite, and other minerals, were characteristic especially of the Trotter and Parker shafts. This garnet, which was all somewhat manganiferous, rarely occurred in crystals, though here and there rough crystals were found embedded in the calcite. The material analyzed and named "polyadelphite" by Thomson (24) was probably of this nature.

Sharp dodecahedral crystals of black, brown, and yellow garnet embedded in calcite have been recorded from Franklin but without definite statement of locality. Abundant rough brownish dodecahedrons, some of them several inches in diameter, were found with pyroxene in a pocket in limestone near Double Rock and are illustrated in plate 11, A. Some of the garnet was embedded in colorless sphalerite.

Small translucent raspberry-red and pale-yellow dodecahedrons, together with massive granular garnet of the same colors, form a considerable part of the specimens from the pockets at the Buckwheat mine in which were found, among other species, the rare mineral pyrochroite. (See page 50.) This garnet is manganiferous, but sufficient material for analysis could not be obtained, and the refractive index is that of andradite.

At the Gooseberry iron mine on Balls Hill there was opened at one time a large pocket containing several bushels of garnet crystals of great beauty. As seen in the Losey and Canfield collections these garnets are black, very brilliant, large, and very symmetrical, being dodecahedrons with narrow faces of the trapezohedron. One in the Canfield collection measures 23 inches around a central section. They were associated with pyroxene, zircon, and scapolite. Red and cinnamon-brown massive garnet were also found there with magnetite. It showed but a trace of manganese, differing in that respect from all the samples tested of garnet found near the zinc ores, which are rich in manganese.

At Sterling Hill garnet is not so abundant as at Franklin. Dodecahedral crystals of rough brown garnet, an inch or more in diameter, were fairly numerous in the pockets containing dysluite, and both single crystals and groups, with jeffersonite and dysluite, are preserved in the Canfield collection.

Bright-red dodecahedrons partly embedded in limestone were found in the stripping of the calamine bed in the Noble mine. The best of these—a splendid crystal measuring nearly 3 inches on the edge of the very regular dodecahedron—is in the collection at Princeton University.