104 PHYSIOGRAPHY. 



is Richmond in Massachusetts, North America, where it 

 is found along with prismatic Iron-ore. 



GIESECKITE. 



Gieseckite. JAM. Man. p. 323. Gieseckite. PHILL. 

 p. 113. 



Rhombohedral. R - oo. R -f oo. Cleavage 

 not perceptible. Fracture uneven, splintery. 



Lustre resinous, faint. Colour olive-green, grey, 

 brown. Streak uncoloured. Feebly translucent 

 on the edges ... opake. 



Hardness = 2-5 ... 3-0. Sp. Gr. = 2-832, 



According to ST no MEYER, it consists of 



Silica 46-07. 



Alumina 33 -82. 



Magnesia 1-20. 



Black Oxide of Iron 3-35. 



Oxide of M anganese 1 1 5. 



Potash 6-20. 



Water 4-88, 



It occurs in Greenland, with prismatic Feld-spar. It was 

 first described by Mr SOWERBY. 



GMELINITE. 

 KOUPHONE-SPAR. 



Sarcolite. VAUQUELIN. Ann. du Mus. IX. 249. XI. 42. 

 Var. of Analcime. HAUY. Traite, 2de Ed. T. III. 

 p. 177. Hydrolite. DE DREE. Musee. p. 18. Gmeli- 

 nite. BREWSTER. Edin. Journ. of Science. Vol. II. p. 262. 



Rhombohedral. Combination P GO. P. P -f- oo, 

 similar to Fig. 196. Angles approaching to 

 those of rhombohedral Kouphone-spar, which are 

 for the isosceles pyramid = 145 54', 71 48'. 

 The inclination of y on #', Dr BREWSTEB found 

 to be = 83 36'. 



