A, A, Julien on Minerals of the Key of Sombrero. 367 
ART. XXXVIIL.—On Metabrushite, Zeugite, Ornithite and other 
minerals of the Ke mbrero, W. I,’ by ALEXIS A. 
JULIEN, Assistant in School of Mines, Columbia College. 
origin and limited extent. 
Calcite, and its phosphatic pseudomorphs. 
ommon salt, in cubes and in curved crystals. 
Brushite, in massive specimens. 
Metabrushite, and its pseudomorph, zeugite. 
Ornithite, and its pseudomorphs. 
1. Calcite—This mineral, in its variety of massive, lamina- 
4 or traces of organic matter, 
sulphate of lime, oxyd of iron, alumina, and their phosphates, and 
fluorine. The masses of calcite in the vicinity of the guano- 
veins have participated 1 : 
ing pseudomorphs have been produced, not only of the massive 
and stalactitic forms but of the crystals. Of the latter three 
varieties may be mentioned : . : 
_(1.) Those which consist simply of an ordinary crystal of cal- 
cite, overlaid with a brownish film of the phosphatic material. 
. * T take this unity to acknowledge my indebtedness to Prof. C. F. Chandler 
of the School of Colombia College, for the use of his private laboratory 
which nearly the whole of this investigation has been made), for his gene 
assistance and advice: to Profs. 0. N. Rood and C. A. Joy of the School of Mines, 
for the use of instruments and books; and to Prof. J. D. Dana of New Haven, for 
his crystallographic examinations.—a. A. J- 
