r1 “ee 
.* | ww 
STU 
Minerals from New Holland. 313 
or hollowed, so as not to admit of measurement by 
the goniometer. Some of these faces form a regular 
uniform curve, inclining equally towards the ter- 
minal. planes P, obliterating the small replacements 
a, f, which are usually very distinct. 
Stilbite. (granai Kouphone-spar, M. )— 
The crystals “generally are not well defined, the 
masses consisting of pure white, pearly folia, forming 
sheafs or fasciculated groups, showing at their free 
extremities, only imperfect crystalline faces of a low ` 
pyramid, inclining from the solid angles of the prism. 
Some of these masses, composed entirely of the stil- . 
bite, are of a globular form, presenting on fracture, a 
radiation of fibres from a common, contre. 
crystals of this mineral, were, a w x. in some 
.Fig.6. ofthe vesicular cavities of the amygdaloid, 
My exhibiting the primary prism, compressed , 
y, 
into low, six-sided tables, the four replace- 
ments at the summits of the prism being 
narrowed down, so as to form regular bev- 
NN eled edges upon the four corresponding 
sides of the tables, producing a form nearly ` 
similar to Fig. 6, taken from the System of Mineral- 
ogy by Beudant, Vol. IL., plate x. fig. 62. 
Mesotype of Phillips. (Peritomous Kouphone- 
spar of Haidinger.)— A nest of the crystals of this 
mineral was met with in the form of small implanted 
individuals, occupying the cavity of a mass of quartz 
and chaleedony. They are in elongated rhombic 
prisms, colorless, transparent, and of a glassy lustre ; 
but a few of them have a silky, fibrous appearance, 
VOL. III.—NO. HI. 
