232 native metals and KARPHOSIDERITE. Breithaupt. Consists of phosphoric acid, oxide of iron, and water. Sp. Gr. 2-5. H. = 4 0—4-5. Occurs in reniform masses of a straw-yellow colour ; lustre re sinous ; fracture uneven ; feels greasy. Before the blowpipe, in the open tube, it gives off water, accompanied by fumes which redden turmeric paper; alone on charcoal it becomes black- and at a high temperature melts into a globule, which is power- nf d,T? nCtIC > Sol , u , bl ® with faci,it y in borax, and with salt of phosphorus forms a black scoria. This mineral was distinguished by Breithaupt, who named it in allusion to its straw-yellow colour. Its locality is Labrador. SULPHATE OF IRON. Green Vitriol. Melantdrie,J}endant. Eisen-Vitriol,\V. FerSulphate II Heim-Prismatic Vitriol Salt, M. ' Berzelius"' 0 288 ’ F ° t0Xide of iron 25-7 > w ^er 45-4- Sp. Gr. 1-84—1-9. II. = 2-0. Primary form an oblong rhombic prism of 99° 23' and 80° 27'. fonf over the edge x 82° 21' bon f yy 23 b on the edge x 104 25 It presents various shades of green, sometimes emerald- green ; but more frequently, owing to exposure, is externally of a ye low or yellowish-brown colour. It occurs massive, pulver- ulent, and in stalactites; and crystallizes in the form of a right oblique-angled prism ; sometimes modified ; cleavage perfect par allel to b, less so to/,- translucent; lustre vitreous ; taste ex- trernely astringent; fracture conchoidal. It is readily soluble in double its weight of water, and the solution turns black on the ad-