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ANNALS NEW YORK ACADEMY OF SCIENCES 
diabase. 1 This material appears to be the so called diabantite 2 and simply 
an insoluble residue of trap otherwise dissolved in water. 
Dr. Alexis A. Julien in a recent discussion of the composition of minerals 3 
has suggested that diabantite is not a mineral but a mixture of minerals 
which as deduced from analyses by G. W. Hawes of the trap at Farmington, 
Conn., are as follows: pyroxene (residual), enstatite (residual), prochlorite, 
ekmanite, deweylite, limonite, periclase. He considers the first two of 
these to be residues from the solution of the trap and the remainder 
recombinations of its dissolved constituents. 
According to Dana 4 diabantite is apparently a product of the altera¬ 
tion of the augite of the diabase; according to Emerson, the first product 
of the decomposition of the diabase 5 “ and seems to have been formed by 
slow deposition from water.” 6 
In each quarry the minerals have usually a prevailing characteristic color, 
ranging from pure white in some quarries to yellowish white, greenish white, 
yellow, orange, red and brown in others. This seems due to the iron in the 
trap, chiefly perhaps to its liberal content of ferrous iron. As a quarry is 
extended, however, rock of a different facies may be encountered, and in 
course of time the preponderant species of minerals and their prevailing color 
are liable to change. 
Although Bischoff 7 and subsequently others have recorded many details 
of this kind relating to the occurrence of minerals in general it seemed to me 
that a record of some of those observed in the New Jersey trap quarries may 
help eventually to disclose the genesis of the zeolitic group. Among such 
details the order of generation of the species seems important and following 
is a list of such sequences in their occurrence as I have noted them in New 
Jersey localities, arranged alphabetically. 
Sequence or order of occurrence of the minerals. 
Albite . 8 Sequent on calcite, chabazite, diabantite and quartz, West 
Paterson. 
1 J. V. Lewis: Geol. Survey of N. J., Annual Report for 1907, p. 107. 
2 Id., p. 152. 
s Annals N. Y. Acad. Sci. XVIII, 139-142. 190S. 
^ Syst. Min., 659-660. 1S92. 
s Am. Jour. Sci. Ill, XXIV, 198-201. 
e U. S. Geol. Survey, Bull., No. 126, pp. 72-74. 
7 Chem. and Phys. Geol., German edition 1847; 1848 et seq„ English (Cavendish Soc.) 
edition, London, Vol. 1, 1S54, Vol. 2, 1855, Vol. 3, 1S59. 
s Identified by Dr. C. Palache according to Mr. F. A. Canfield. 
