BLACK LEAD, 
Opaque. 
GENERIC CHARACTER, 
Of a dark metallic lustre, leaving a strong mark on 
paper. 
Yery brittle, breaking into fragments of no determinate 
figure. 
— 
SPECIFIC CHARACTER. 
Graphites Plumbago. G. nitoris metallici, texturae schistosae. 
Black Lead, 
Linn. Syst. Nat. Gmel. 3. p. 284. 
Of a metallic lustre and slaty fracture. 
Molybdaenum tritura caerulescente im- 
palpabile at subsquamosum. Syst. 
Nat. Linn. xii. 3. p. 121.no l.a ( 3 . 
Ferrrum nigricans splendens, unctuo- 
sum inguinans. Woltersd. Mi~ 
ner. 3 1 . 
Ferrum corrosum volatile mineralisa- 
tum, minera nigrescente squamosa 
pictoria magneti refractaria. Waller. 
Syst. Miner. 2. p. 249. no< 14. 
Miner. 2. p. 58. Brogn. Miner. 
2. p. 53. 
This useful 
mineral is found to be of an inflam- 
Enable nature, and therefore is placed among other 
combustible substances. It is well known for the 
fine blackish trace which it leaves when rubbed on 
