16 



■;,;,' ;T.*:rT -5 J'"-;!-) '/7> '^fir'j'^. .hoi!;')? 



GEOGNOSTIC OCCURRENCE. 



.i!0{irfti"> 

 The Hungarian rutile is found imbedded in a kind of 

 quartz, passing into rock crystal, and foniiing nests in mica 

 slate ; it is therefore of cotemporaneous formation with the 

 rock in Avhich it lies. That from St. Gothard in Switzer- 

 land occurs partly in those drusy cavities, tvhich are not 

 unfrequent in granitic mountains of high antiquity, ' lying 

 in or upon the rock crystal, adularia, and foliated chlo- 

 rite, with which those cavities are lined, and partly dis- 

 persed through, or seated in, the scarcely perceptible clefts 

 of one of those nameless chloritic rocks, which abound so 

 much throughout the Alps in general. That from Aschaf- 

 fenberg is said to occiu- in ^rWnite; that from Saltzburg is 

 found imbedded in massive common treniolite. The rutile 

 from Spain and Siberia is imbedded in rock crystal. It 

 would therefore appear that this fossil lays claim to great 

 antiquity, the time of its production falling witlrin the period 

 of the earlier primitive rocks, and that the metal it con- 

 tains probably surpasses, in that lespect, tin, molybdaena 

 and tungsten, vieiiig even wijLh iron, pjij^.^i^ngaUBse.* 



,:; :•.;,. ;;.ir ..,.,,■, The 



* Von Buch has discovered rntile in layers of quartz, in clay slate (Thon- 

 schiefer), near Miiiilbacli in Saltabiirgi' 5n the vicinity of metallic layers, con- 

 sisting of copper glance, copper pyrites, iron pyritps, nickel, and rarely native 

 copper: also on the mountain Brennkogl, in the valley of Fu§ch; where it 

 occurs in mica slate, either rcticularly aggregated in rifts, or in acicular 

 crystals, accompanied by those singular C3lindrically aggregated cr3'Stals of 

 foliated chlorite, in venules of almost coeval formation with the rock itself.— 



Buck's Geognostische Beobaclitimgai. R. J. 



Rutile 



