ORDER VII. TETRAHEDRAL GARNET. 357 



ed by Professor MJTSCHERLICH^OS belonging to the pre- 

 sent species. 



3. Some of the varieties of pyramidal Garnet occur in 

 imbedded crystals in a kind of serpentine, containing also 

 decomposed crystals of an unknown mineral in the shape of 

 trigonal dodecahedrons ; others are found massive in rocks 

 and mountain masses, in the cavities of which they appear 

 in a crystallised state. They also occur in veins, but the 

 second kind of their repositories is the most frequent. Py- 

 ramidal Garnet is accompanied by rhombohedral Lime-ha- 

 loide, rhombohedral Talc-mica, various species of the gene- 

 ra Kouphone-spar, Augite-spar and Feld-spar, frequently 

 by dodecahedral Garnet and ihombohedral Quartz, and 

 sometimes by ores of iron and copper, &c. 



4. The imbedded crystals, presenting less complicated 

 varieties of crystallisation, have been found on the banks 

 of the Wilui river, and I^ake Baikal in Siberia ; the im- 

 planted complicated crystals occur at Monte Somma, among 

 the fragments ejected by Vesuvius, and have been ori- 

 ginally formed in those cavities of the rock in which they 

 are found. At Haslau near Egra in Bohemia, it occurs in 

 crystals imbedded in rhombohedral Quartz, also in mas- 

 sive varieties of a columnar composition ; in similar cir- 

 cumstances in Finland, where, among others, they are ac- 

 companied by prismatic Titanium-ore. In beds in lime- 

 stone it occurs at Orawitza in the Bannat of Temeswar, 

 and at Mount. Monzoni near Fassa in Tyrol, also near 

 Christiania in Norway, and in magnificent crystals in veins 

 traversing primitive rocks, in the valley of Brozzo and 

 other places in Piedmont. It is found besides in Spain, in 

 Ireland, America, &c. 



2. TETRAHEDRAL GARNET. 



Tetrahedral Garnet or Helvine. JAM. Man. p. 224. Hel- 

 vin. PHILL. p. 244. Kelvin. WERN. Hoffm. H. B. 

 IV. 2. S. 11 2. Helvin. LEONH. S. 430. Helvine. 

 HAUY. Traite', 2de Ed, T, II. p. 333. 



