426 
DESCRIPTIVE MINERALOGY. 
LOCALITIES. 
Green malachite has heretofore been found in this State only as an incrustation. Thus it 
occurs on copper pyrites in the counties of Columbia, Dutchess and Sullivan, in the veins of 
galena. In the same form, it has also been observed in the limestone of Erie county ; in the 
grey band at Lewiston in Niagara ; in the trap in Rockland, and on magnetic iron ore at the 
Phillips mine in Putnam. 
This mineral, in small quantities, having the fibrous character, and associated with the red 
oxide and sulphuret of copper, occurs at the copper mines of New-Jersey, and at the Per- 
kiomen lead mine in Pennsylvania. The United States, however, has not hitherto afforded 
very fine specimens. 
AZURITE. 
[In allusion to its colour.] 
Cuivre Carbonate Bleu. Hauy. — Blue Carbonate of Copper. Cleavcland and Phillips. — Blue Malachite. 
Shepard. — Prismatic Blue Malachite. — Jameson. — Hcmiprismatischer Lazur-Malachit. Mohs. — Hydro¬ 
carbonate of Copper. Thomson. — Azurite. Beudant. 
Description. Colour azure or berlin-blue, sometimes passing 
into blackish blue. Streak similar but lighter. It occurs regularly 
crystallized in concretions which are scopiform and stellular, radiated, 
and also curved lamellar; massive, globular, stalactitic and cellular. 
Primary form an oblique rhombic prism. Fig. 509. M on M/ 98° 
50 / ; P on M or M' 91° 30 / (Phillips). Cleavage perfect, parallel to 
M and M / ; difficult parallel to P. Fracture conchoidal. Lustre 
vitreous or vitreo-resinous. Transparent to translucent on the edges. 
Brittle. Hardness from 3.5 to 4.0. Specific gravity from 3.50 to 
3.80. Before the blowpipe, it blackens, decrepitates, and at length 
fuses. Colours borax green. Dissolves in nitric acid with effervescence. The solution pro¬ 
duces a blue colour with ammonia, and forms a coating of copper on a clean plate of iron. 
Composition. Copper 56.00, oxygen 12.50, carbonic acid 25.00, water 6.50 ( Vauque- 
liri). Formula 3Cu0.2C0 3 +Aq. 
Geological Situation. It occurs in beds and veins in rocks of various ages, usually 
associated with other ores of copper, galena, zinc blende, etc. 
LOCALITIES. 
Incrustations of azurite are found with copper pyrites at Sing-Sing in Westchester county ; 
and the same mineral is also occasionally observed, forming thin scales on the limestone in 
the same vicinity 
Fig. 509. 
