Notice of Minerals from New Holland. 163 
choidal fracture, disclosing in the centre of the mass, blood red 
spots of jasper, and thus constitutes the heliotrope. There are 
spots also of a lighter green, and bluish white chalcedony, inter- 
spersed with the deeper ground, which, if polished, would render 
the specimens highly ornamental in jewelry. 
Ribbon Agate and Moss Agate.—These two interesting vari- 
eties 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 chal- 
cedony, the white chalcedony appearing like a delicate cloud 
passing through the mass, while the former is produced by paral- 
lel. 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 mioss-like ramifications which are characteristic 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 beatity with the finest oriental specimens. They are usually 
more or less accompanied by masses of pure opake white chalce- 
dony, and also by a stalactical, botryoidal variety of several shades 
of color, interspersed with quartz crystals, and attached to portions 
of the tr: 
Cacholong.—This variety forms 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 charac- 
ters of opacity and adhesiveness to the tongue. _ gt enters into the 
composition of a ‘coarse ribbon agate. 
MG 2,—S mall nike: Snnpmccds a greenish eétor, 
translucent. when first broken, and presenting a conchoidal frac- 
ture, occupy the vesicular cavities of the same amygdaloid which 
forms the gangue to the apophyllite before described. It is suffi- 
ciently distinguished from chlorite or green earth, and precisely 
resembles this mineral from Scotland. The opinion of most 
mineralogists is, that this mineral is only a variety of some other 
species, or the remains of some other, which has undergone decom- 
position. _ 1 am led to regard the latter opinion as the true one in 
the present case, from the occurrence of small granular concretions 
of what appears to be zeolite in the centre of those masses which 
have not entirely disappeared ; though the infusibility of the de- 
