40 
657. 
658. 
659. 
660. 
661. 
662. 
663. 
664. 
665. 
666. 
667. 
668. 
669. 
Pee ee 
Mineralogical Cabinet. 
crystals of feldspar attached to it upon one side, and 
having its pyramidal extremity penetrated by ex- 
ceedingly delicate fibres of asbestus. 
. New-York. Loose tabular crystals. 
. Dauphiné. A group of tabular crystals, colored by 
chlorite. 
. Alps. A transparent single crystal, in which three 
adjacent faces of the pyramid are produced at the 
expense of the other three, one of which is scarcely 
visible ; and one of the solid angles between the 
pyramid and prism is replaced by two rhomboidal 
planes. 
. Haddam, Connecticut. In regular six-sided prisms, 
with six-sided pyramids, one of which has the alter- 
nate planes unduly produced. 
. Haddam, Connecticut. A regular crystal of the com- 
mon form, with smaller ones attached to its base. 
. Haddam, Connecticut. The prism slightly curved. 
. Vermont. A fragment of a large crystal. 
. Scotland. A short six-sided prism, with a six-sided 
pyramid. An unusual appearance is occasioned in 
the lower part of the prism by fissures. 
. Plainfield, New-York. Single crystal, like 634. 
do. do. 
do. do. 
do. do. 
. Smithfield, Rhode Island. A regular six-sided prism, 
imperfectly terminated. 
. Paris, Maine. A regular six-sided prism, terminated 
by a six-sided pyramid. The prismatic faces are des- 
titute of lustre, owing to numerous transverse striae. 
. Lake George, Diamond Island. A six-sided prism, 
terminated at one extremity by a six-sided pyramid, 
of which one of the faces is produced so as nearly to 
extinguish the other five. A rhomboidal truncation 
is also observable upon this crystal. 
. Diamond Island. Three prismatic crystals grouped 
together. 
