ree 
Mineralogical Cabinet. 
. Plainfield, New-York. Form similar to 629, except 
that the intervening prism is shorter, and that the 
rhomboidal planes do not occur in any regular order. 
. Plainfield, New-York. Three crystals. do. 
do. do. do. — the 
intervening prisms being rather longer. 
. Plainfield, New-York. Three crystals. 
do. Single crystal. Regular six- 
sided prism, terminated by six-sided pyramids. 
. Plainfield, New-York. Four crystals, remarkable for 
the undue extension of some of their faces, in conse- 
quence of which others are thrown out of their pro- 
per places, or nearly extinguished, and, consequent- 
ly, the symmetry of the crystal impaired. 
. Easton, Pennsylvania. Var. Irisated quartz. Form 
like 634. Interior filled with fissures, in consequence 
of which it exhibits the prismatic colors in a very 
striking manner. 
. Compostella, Spain. Var. Compostella hyacinth. De- 
tached crystals of the form of 634; colored red by 
iron. 
. Compostella, Spain. do. Imbedded in gypsum. 
. Bohemia. Var. Iron Flint. Form like 634. The 
crystals confusedly aggregated; color yellow. 
. Alps. Var. Amethyst. Form like 634. 
. Paris, Maine. Var. Smoky quartz. Form like 634. 
do. do. - The crystals at- 
tached to a mass of common quartz by their prisma- 
tic sides, and to each other, by the apices of their 
pyramids. 
. Siberia. Var. Amethyst. Form like 642; color dark 
purple. 
. Alps. Crystallized in regular six-sided prisms, termi- 
nated at one extremity, by six-sided pyramids: 
two sides of the pyramids extended at the expense 
of the others, and in one crystal a remarkable en- 
largement of a single plane is observed. The crys- 
tals eminently transparent. 
