I4o NEW YORK STATE MUSEUM 
are considered responsible for these forms. lf there had been a 
great separation in point of time between the formation of the 
carbonate and the quartz, the boxes would show the effect of 
another movement in the form of fractures. The most ,notice- 
able characteristic of the quartz is the faithfulness with which 
it conforms to the carbonate whether in band, comb or box structure 
and this would not have been the case had there been a definite 
secondary set of fractures allowing the silica-bearing solutions 
to deposit their load at a different time. 
Many of the quartz plates or bands show a comb structure, as 
though the quartz had formed in an open space which is the case 
with the larger and more typical comb structures and boxes. It 
is difficult to account for the banded structures in the same way 
that Ransom (5) does with the banded veins of the Silverton 
district of Colorado; that is by successive openings and fillings 
because there is no evidence of the movement responsible for 
such a reopening and if there was, there would have to be a cer- 
tain uniformity throughout the deposit, evidence for which is 
strikingly absent. This much is certain, however, the original 
breccia fragments of the Grenville marble show evidence of hav- 
ing been replaced by these later minerals, as will be seen when 
the contents of the vein are discussed. 
Origin of the Box Structure 
The so called boxes, as can be seen from plate 4, resemble some 
crystal form, though lacking certain very necessary crystal 
requirements. The plates of granular crystalline quartz termi- 
nate in well developed pyramidons projecting inward, after the 
manner of geodes, while the exterior surface of the plates is 
covered with minute crystals or moulds of the same mineral with 
the c axes parallel with the plane of the plate, resembling 
drusy quartz. Associated with the interior quartz crystals are 
the following crystallized primary minerals: calcite, chalcopy- 
rite and sphalerite, accompanied by the secondary products 
limonite, malachite, kaolin and vermiculite. Asphalt is also 
found intimately associated with the quartz. 
Some of the more typical boxes are shown in plate 4. In 
shape they are extremely varied as they are in size, though in 
the former respect the number of faces or plates and the inter- 
plate angle determine the shape. With the material at hand, 
forms with as few as seven faces and others with as many as 
