- Colour, black.
- Physical condition, fragile.
- Fracture, splintery.
- Colour, when reduced to powder, blackish brown.
- Burns with difficulty, giving a short flame; not very smoky, and leaves a brick-red ash.
- Coke not very spongy, pulverulent and lightly agglutinated.
- Density at 33° C., 1·3082.
Analysis.
| Hygroscopic water | 3.73 | ||
| Volatile constituents | 45.49 | ||
| Coke | Fixed carbon | 48.20 | |
| Ash | Silica | 12 | |
| Aluminic | 2.46 | ||
| Ferric, calcic | |||
| Magnesic | |||
| Chloric | |||
| Sulphuric acids, etc. | |||
| 100.00 |
| Coke = 50.79. Equivalent calories | 5203.44 | |
| Ash = 2.58. Absolute calorific effect, centesimal | 64.41 | |
| Sulphur per 100 of lignite | 0.1633 | |
| Iron calculated in metallic state | 1.2173 | |
| Lead reduced by 1 gramme of combustible (mean) by Berthier’s assay | grammes | 21.90 |
Various Minerals.
Lead.—Galena is found in Tayabas and in Camarines Norte; in the latter province there is found chromate of lead with ferruginous quartz. This ore is often found mixed with iron or copper pyrites, and sometimes with blende.
I have seen samples of galena from Cebú which was said to be auriferous, but I have never heard that any of these ores have been worked anywhere in the islands.
If it should be found profitable to smelt the gold-bearing ores, as is so splendidly done at Denver, Col., the galena will be necessary to the success of the process.