Category: Science - Physics
Colour, dark brown, almost black; brittle, powder a lighter shade of brown than the mineral; hard, scratches glass, scintillates with steel, with a red spark; a degree of polish produced, where the steel strikes, and when the steel is impressed upon it.
Colour, dark brown, almost black; brittle, powder a lighter shade of brown than the mineral; hard, scratches glass, scintillates with steel, with a red spark; a degree of polish...
2. PART II. _A variety of the Ore.General characters as above, but on some parts, there is seen a whitish, or yellowish, or sometimes darkish metallic substance; it is in thin plates, like the leaf metals, and s...
3. PART III.--A. _Chemical Trials.1. Muriatic acid, hot or cold, produces no effect; hot nitro-muriatic dissolves the ore with energy, red fumes are evolved, and generally a red solution obtained, from which amm...
4. Part III.6. Heated by the blow-pipe on charcoal, it was instantly volatilized in part, and in part decomposed, with an almost explosive effervescence; numerous ignited globules of metal...