H = 3.5-4.0, G = 3.9-4.1.
Color, yellow to black. Lustre, resinous, brilliant, and sometimes submetallic. Heated in an ignition tube sometimes decrepitates. Before the Bp. on Ch. infusible. Before the Bp. on Ch. with Na2CO3 easily reduced. With Co(NO3)2 gives the characteristic reaction. It frequently contains small quantities of Cd, Hg, Sn, Pb, Au, Ag, etc.
I
Table of Colors of Coatings on Charcoal
| Element | Color Hot | Color Cold |
| Antimony | (Rather volatile) | White |
| Arsenic | (Very volatile) | White |
| Bismuth | Orange-Yellow | Lemon-Yellow |
| Cadmium | Brownish Yellow | Reddish Brown |
| Lead | Lemon-Yellow (volatile) | Lemon-Yellow |
| Silver | Dark Red | Dark Red |
| Tin | Faint Yellow | White |
| Zinc | Yellow | White |
II
Table of Flame Colorations
| Red | Yellow | Green | Bluish Green | Blue | Violet |
| Calcium | Sodium | Barium | Bromine | Chlorine | Potassium |
| Lithium | Boron | Copper | |||
| Strontium | Iodine | Phosphorus |