CALCITES OF NEW YORK 59 
the plate, connect the two points thus obtained with point b and the 
resulting lines will be the edges X and Y required. 
Several of the important points are indicated on the plate which is of 
simple construction and can be easily duplicated since the sides of the 
triangle are twice the length of the horizontal axis, the base line scale 
proportional to the vertical axis, the scale C proportional to # and the scale 
C’ proportional to 4 the vertical axis. 
A cardboard model of the crystal habit of any combination can readily 
be reproduced in plaster of paris or paraffine, furnishing blocks upon which 
the modifications may be cut with a knife blade, file or emery paper scraper. 
DESCRIPTIONS OF OCCURRENCES 
ROSSIE, ST LAWRENCE CO. 
Plates 3-5 
The calcite crystals from Rossie have long been known to mineral 
collectors, and handsome specimens of the large and perfect combinations 
from this locality are to be found in every important mineral collection. 
This locality is situated 2 miles southwest of the village of Rossie where 
between the years 1835 and 1840 several openings were made in a vein of 
galena which were after this period abandoned. During the time of opera- 
tion, however, a mass of material of remarkable mineralogic interest was 
brought to light including specimens of galena, pyrite, calcite and celestite 
of special quality, as well as associated fluorite, chalcopyrite, anglesite, 
hematite and rare cerussite. Beck mentions the calcite as occurring in 
water-filled cavities of the mine, associated with crystallized galena, pyrite 
and chalcopyrite. To this association should be added fluorite and marca- 
site which latter mineral was noted by the writer on a fine specimen in 
the Bement collection. é 
The material is of exceptional quality, the smaller crystals which 
afforded the material for goniometer study being remarkably free from 
distortion and conforming closely to the idealized representations given in 
the figures. 
Type I [pl. 3, fig. 1, 2]. The crystals included under this type repre- 
