420 



RECORDS OP THE AUSTRALIAN MUSEUM. 



I. — Ben Lomond, N.S. Wales. 

 II.— Table Mt., Colorado.'" 

 Ill, — Eisenach, Thuringia.'* 



IV. — Calculated for 



C Na., O. A1,,0 

 I 2 (CaO 



3Si02. 2H2O. 

 ALO3. 3SiO,. 3HaO). 



NATROLITE. 



Inverell, New South Wales. 



The mineral occurs as transparent colourless aggregates, 

 radiated in structure. Extinction is straight and compensation 

 takes place with quartz wedge perpendicular to direction of 

 elono;ation. 



I. — Inverell, N.S. Wales ; taken for water -6459 grams, general 

 •8978 grams. 



II. — Cape Blomidon, Nova Scotia.^* 



III.— Calculated for Na,0. ALO,. 3SiO,. 2H,0. 



THOMSONITE. 



Inverell, New South Wales. 



This is white, radiated, decrepitates before the blowpipe^ intu- 

 mesces slightly and yields an opaque white bead. Analysis was 

 made in duplicate : 



1^ Hillebrancl- — Loc. cit., p. 35. 



J'' Liicdecke— Neues Jahrb. Min., 1881 , ii., p. 34. 



"^ Brush — Anier. Journ. Sci , xxxi., 1861, p. 365. 



