316 Minerals from New Holland. 
Ribbon Agate and Moss Agate. — These two in- 
teresting varieties appear in the same specimens. 
The branching fibres or dendrites of the latter, of a 
. brown or reddish-brown color, are imbedded in a 
deep ground of transparent blue and white chalcedo- 
ny,the white chalcedony appearing like a delicate 
` cloud passing through the mass, while the former is 
produced by parallel zigzag lines of a pure milk- 
white chalcedony, alternating with narrow stripes of 
the same blue ground, the parallelism forming a 
beautiful border to the specimens, and enclosing the 
curious moss-like ramifications which are character- 
istic of this variety. In one specimen, the green 
chalcedony has assumed the: branching form, and is 
freely distributed through the same ground of blue 
and white. If polished, these several varieties will 
vie in beauty with the finest oriental specimens. 
They are usually more or less accompanied by 
masses of pure opake white chalcedony, and also by 
a stalactical, botryoidal variety of several shades of 
color, interspersed with quartz ee and attached 
to portions of the trap: 
_ Cacholong. — This variety bom thin crusts upon 
the surfaces of the fragments of quartz, and fills the 
space in which crystals of the latter have been 
formed. . It presents the common characters of opaci- 
ty and adhesiveness to the tongue. It also enters 
into the composition of a coarse ribbon agate, and un- 
der this form there are portions of the. mass that 
resemble the onyx agate. . 
Chlorophaite.— Small globular masses, soft, of a 
greenish color, translucent when first broken; and 
presenting a conchoidal fracture, occupy the vesicular 
