1889. | NEW YORK ACADEMY OF SCIENCES. 45 
January 7, 1889. 
REGULAR BusINEss MEETING. 
The President, Dr. NEWBERRY, in the Chair. 
Forty-two persons present. 
The report of the Council was read, recommending the pay- 
ment of certain minor bills. 
Dr. JAMES J. FRIEDRICH exhibited and described some re- 
markable minerals from the copper district of Arizona, as fol- 
lows: 
I wish to present a few specimens from Bisbee, Arizona, viz. 
(1) a beautiful green calcite and (2) an aragonitic stalactite: 
The calcite is imbedded in a mass of malachite; in the centre of 
the stalactitic columns, fine apertures are observed, around 
which silky fibres of malachite are arranged concentrically. 
Through these apertures malachite penetrated the columns, 
coloring them in some instances only in the centre, while in 
other columns the whole mass of the calcite is penetrated and 
tinted. The most beautiful coralloidal specimens of aragonite 
come from the Silver Spray Mine, which is at present not ac- 
cessible; private collections in Tombstone contain very fine large 
specimens, resembling a good-sized coral-stem, with its branches 
perfectly white and translucent. In this region of the carbon- 
ates, it is very natural that pseudomorphs and imitative shapes 
should be very frequent; and the one mineral which is best 
adapted for the purpose is azurite. Pure massive azurite, trans- 
lucent and bearing in its crystallized form a close resemblance 
to epidote, is rarely found. This specimen (3) in point I ob- 
tained at the Silver Bear Mine, at which mine exclusively 
chalcocite also occurs. 
(4.) The next specimen is a perfect pseudomorph of azurite 
after calcite; I procured it from a dealer in San Francisco, who 
would not tell me the locality where it was found, but I presume 
it to be from Black Co., N. M., where fine specimens of azurite 
are not rare. 
(5.) These specimens are odlitic in structure; the materials 
generally found to build up the different layers of the concre- 
tions are tenorite, malachite, and azurite. ‘The same construc- 
tion is seen in No. 6 in stalactitic shapes and incrustations. 
No. 7 is one of the most instructive specimens, exhibiting all 
the various degrees of metamorphism. ‘This piece of ore shows 
in its totality the structure of fibrous aragonite; the principal 
