396 
DESCRIPTIVE MINERALOGY. 
SCORODITE. 
[From the Greek tfxopodov, garlic ; in allusi° n to its odour under the blowpipe.] 
Seorodite. Cleaveland, Beudant, Phillips and Thomson. — Cuivre Arseniate Ferrifere. Hauy ? — Peritomes 
Flus-Haloid. Mohs. — Cube Ore. Shepard? (This mineral was incorrectly supposed to be an arseniate of 
copper combined with oxide of iron.) 
Description. Colour leek-green passing into white, olive-green 
and liver-brown. Streak white. It occurs regularly crystallized. 
The primary form is a right rhombic prism. Fig. 471. M on M/ 
120° 10' (Phillips). Cleavage imperfect parallel to the planes MM' 
of the prism, and to its lesser diagonal. Fracture uneven. Lustre 
vitreous, inclining to adamantine. Translucent on the edges to semi¬ 
transparent. Rather brittle. Hardness from 3.5 to 4.0. Specific 
Before the blowpipe, it gives out an arsenical odour, and melts into 
a reddish brown scoria which is attracted by the magnet; with fluxes, it exhibits the bottle- 
green colour characteristic of iron. It is soluble in nitric and muriatic acids. 
Composition. Arsenious acid 31.40, protoxide of iron 36.25, sulphuric acid 1.54, pro¬ 
toxide of manganese 4.00, lime 2.00, magnesia 2.00, water 18.00 ( Ficinus ). 
Geological Situation. This mineral is associated with arsenical iron pyrites and other 
minerals, and occurs in white limestone. 
Orange County. Seorodite has heretofore been found in the United States, only on the 
farm of Mr. B. Hopkins, near the village of Edenville in the town of Warwick. It is in the 
form of minute crystals and druses of a leek-green, grass-green and greenish white colour. 
Before the blowpipe it fuses readily, with the extrication of arsenical fumes, into a magnetic 
scoria. It is associated with arsenical pyrites, iron sinter, oxide of iron, etc., and is found 
in a vein in white limestone. 
Fig. 471. 
gravity 3.16 to 3.30. 
IRON SINTER. 
Iron Sinter. Shepard. — Diarsenate of Iron. Tiomson. — Untkeilbarer Retin-Allophon. Mohs. 
Description. Colour yellowish grey, reddish or blackish brown. It occurs in kidney-form 
pieces, soft, approaching to friable. Fracture coarse and earthy, sometimes conchoidal. 
Lustre vitreous to dull. Soft. Specific gravity 2.4U. Before the blowpipe, it intumesces, 
and some varieties emit a strong arsenical odour, during which they are partly volatilized. 
Composition. Arsenic acid 30.25, peroxide of iron 40.25, water with a trace of sulphuric 
acid 28.50 (Karsteri). 
