o::i5ER VII. KHOMBOHEDRAL QUARTZ. 321 



of granitic and other primitive rocks, sometimes with pris- 

 matic Feld-spar and dodecahedral Garnet. It occurs thus 

 in fine crystals at Ujordlersoak in Greenland, at Arendal 

 in Norway, at Orijerfvi in Finland, in Siberia and other 

 places. The Saplrire ffeau of jewellers is a transparent va- 

 riety of the present species from Ceylon. 



2. RHOMBOHEDJJAL QUARTZ. 



Rhomboidal Quartz (excepting Porcelain Jasper). Float- 

 stone or Spongifbrm Quartz. JAM. Syst. Vol. I. p. 

 174. Man. p. 193. Quartz (exc. Hyalite). Cats Eye. 

 Flint. Chalcedony (exc. Cacholong). Jasper (exc. 

 Porcelain Jasper). Horns- one. PHH.L. p. 1. 9. 13. 

 14. 18. 21. Quarz. Eisenkiesel. Horustein. Kie- 

 selschiefer. Feuerstein. Krisopras. Plasma. Helio- 

 trop. Kalzedon. Jaspis (exc. Opaljaspis and Por- 

 zellan jaspis). Katzenaui-e. Faserkiesel. Schwimstein. 

 WERN. lloffm. H. 15.1 1. 1. S. CO. 64. 75. 83. 93. 

 103. 103. 103. 161. 183. 1C9. II. S. 75. Quarz (exc. 

 Quarzsinler). Eiserkiesel. Jaspis. Kieselschiefer. Horn- 

 stein. Feuerstein. Kalzedon. Schwimmkiesel. HAUSM. 

 II. S. 377- 395. 390. 399. 404. 406. 416. Quarz (exc. 

 Kieseltutf'). LEOXH. S. 117. Quarz (exc. Q. hyalin 

 concretionne and Q. resinite). HACY. Traite', T. II. p. 

 406. Tabl. comp. p. 24. Trait;', 2de Ed. T. II. p. 228. 

 WEISS. Magazin der Gesellschaft naturforschender 

 Freunde zu Berlin. VII. S. 163. KUPFFER. Ann. de 

 Chimie. T. XXV. p. 337. 



Fundamental form. Rhombohedron. R = 75 

 55'* Vol. I. Fig. 7. KUPFFER. 



a = J 10-894. 



Simple forms. R (*) ; R (S) ; 1> (P, z) = 

 133 44-', 103 36', Vorospatak, Transylvania; 

 P + 1 = 124 33', 137 % ; P + 2 (b) = 121 

 14', 157 44' ; I P (a) = 126 14', 129 26' ; 

 | P + 2 (TO) = 122 10', 150 36' ; P + x (r) 



