ART. 18 MIN"ERALS OP ITALIAN MOUNTAIN — CROSS AND SHANNON 39 



GRAPHITE 



A specimen (No. 84552) from North Italian Mountain is a schist 

 which in places is largely massive graphite. This probably repre- 

 sents a highly metamorphosed carbonaceous shale. It contains very 

 numerous black dodecahedral garnets up to 5 mm. in diameter. 



MAGNETITE 



Magnetite, in massive granular form, makes up the bulk of sev- 

 eral specimens from North Italian Mountain (No. 84557). The 

 magnetite masses contain numerous small cavities which contain 

 small masses of pearly talc folia or are lined with tiny sulphur- 

 yellow garnet crystals. 



HEMATITE 



Small aggregates of thin tabular plates of specular hematite occur 

 in specimens consisting chiefly of acicular vesuvianite in calcite 

 (No. 84554). Another specimen shows minute specularite plates in 

 masses composed of fine rosettes of radiating pale brown stilbite 

 blades. The largest plates of this mineral reach 2 cm. in breadth 

 and are contained in thomsonite in sahlite-bordered veinlets in 

 altered diorite. 



CHALCEDONY 



Chalcedony was noted in two specimens (No. 84560). In the first 

 of these a peculiar rounded mass 8 mm. in diameter, of grayish- 

 white chalcedony folds around and partly encloses imperfect epidote 

 prisms in a cavity in a mass of translucent epidote. The second 

 specimen shows a very similar mass of chalcedony of the same size 

 resting on adularia in an adularia-epidote mass. 



SIDERITE 



A single specimen of buff limestone contains cavities lined with 

 minute saddle-shaped siderite crystals. These are brown in color 

 and iridescent with a more or less metallic luster. They are over- 

 lain by scalenohedral crystals of calcite. (No. 84573.) 



ANKERITE 



A specimen of bluish-gray impure limestone contains veins of 

 carbonate up to 4 or 5 cm. thick. White scalenohedral calcite crys- 

 tals rest on a brown-weathering crust 1 cm. or less in thickness. 

 This contains cavities lined with minute saddle-shaped crystals. 

 This mineral is probably iron-bearing dolomite or ankerite. 



