PHYSIOGRAPHY. 



Harmotome. 



247 



Compound Varieties. Twin-crystals. Face of com- 

 position parallel, axis f revolution perpendicular to one of 

 the faces of M and T. The individuals are continued be- 

 yond the face of composition, and produce the cruciform 

 crystals. (See annexed figure.) 



Fig. 227. 



Massive : composition granular, rare. 



1. Alone upon charcoal, it melts, without intumescence, into a clear 

 globule. It phosphoresces with a yellow light, and is not easily acted 



upon by acids. 



2. Analysis. 



By KLAPROTH. By WERNEKINK. By THOMSON. 



8. Harmotome occurs in metalliferous veins, traversing grey-wacke 

 and mica-slate, and in the vesicular cavities of amygdaloidal rocks. 



4. The beautiful, cruciform twins occur at Andreasberg in the Hartz ; 

 and the simple crystals at Strontian, in Scotland. Other localities are, 

 Kongsberg in Norway, Oberstein in Deuxponts, where it is found in ag- 

 ate balls; Baden, near Engelhaus and Buchan in Bohemia, and in the 



