LEVISON, NEWARK IGNEOUS ROCKS 
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stilbite, in microscopic crystals, Snake Hill Shadyside, and Erie cut 
(common). 
Quartz, 1. Rock Crystal. Sequent on ehabazite, West Paterson; on 
pseudomorphous quartz, Upper Montclair, Great Notch, West Paterson 
and Hoxie’s quarry, Paterson; 
2. Amethyst. Sequent on pseudomorphous quartz, Hoxie’s quarry, 
Paterson, and West Paterson; 
3. Chalcedony. Sequent, usually on the trap, several quarries. 
Scolecite. Sequent on prehnite, West Paterson. 
Selenite. Sequent on trap, Great Notch and West Paterson. 
Stilbite. Sequent on apophyllite, Snake Hill, common (the reverse rare); 
on calcite in microscopic crystals, private quarry, Snake Hill, and Erie cut, 
common; in large clusters, West Paterson and Upper Montclair; on datolite 
in microscopic crystals, Snake Hill and Erie cut; on heulandite, Millington 
and West Paterson; on quartz, crystallized, Great Notch and West Paterson; 
on pseudomorphous quartz, Upper Montclair (common). 
Thaumasite. Sequent on heulandite, West Paterson; on pectolite, West 
Paterson and Great Notch; on stilbite, West Paterson. 
Unidentified mineral in filaments. Sequent on trap and diabantite, 
Snake Hill (Plate XII, Fig. 3), Erie cut and Woodcliff; on calcite and 
datolite, Erie cat (Plate XII, Fig. 4) and Snake Hill. 
Summary of Sequences. 
1. Trap, datolite, apophyllite, pyrite, analcite; not common. Snake 
Hill and Erie cut (best specimen). 
2. Trap, datolite, heulandite, gmelinite. West Paterson. 
3. Trap, datolite, gmelinite, laumontite. Snake Hill. 
4. Trap, calcite, drusy quartz, heulandite. West Paterson. 
5. Trap, calcite, quartz (crystallized), datolite, prehnite in balls. Great 
Notch. 
6. Trap, calcite, quartz (crystallized), prehnite in microscopic crystals. 
Great Notch. 
7. Trap, pectolite, natrolite, analcite. Snake Hill. 
8. Trap, stilbite, calcite, quartz (pseudomorphous), stilbite. Upper 
Montclair. 
Conclusions. 
The quantitative estimates of the solubility of trap above given apply only 
to the material employed. Determinations of the solubility of various other 
