Minerals from New Holland. 317 
cavities of the same amygdaloid which forms. the 
gangue to the apophyllite before described. It is 
sufficiently distinguished from chlorite or green earth, 
and precisely resembles this mineral from Scotland. 
The opinion of most mineralogists is, that this min- 
eral is only a variety of some other species, or the 
remains of some other, which has undergone decom- 
position.. I 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 zeo- 
lite in the centre of those masses which have not 
entirely. disappeared ; though the infusibility of the 
decomposed mi neral Vefobà the blowpipe would seem 
to show that some of the ingredients of the zeolite 
have passed away. Shepard regards the mineral as 
decomposed mesotype. ` - : 
In breaking some of the masses of quartz found in 
this collection, I was struck with the singular opales- 
cent and waxy appearance of a fibrous and radiated 
mineral, which was at first supposed to be stilbite or 
mesotype, and which forms veins and globular knots 
within the quartz. Its characters before the blow- 
pipe soon satisfied me that it could not be identical 
with either of these species or with any other of the 
Kouphone-spars; nor am I acquainted with any 
other substance to which it bears any near resem- 
blancé in its general characters. It may prove to be 
a new species; but the absence of any regular crys- 
talline faces in the specimens compels me, thus far, 
to rely solely upon other peculiarities for the deter- 
mination of its character. Of these, I have drawn 
up a description, with which, however, I shall not 
occupy your attention, unti] I am enabled to add. 
