LiVERSiDGE. — On xo)ne of the X. Z. Minerals in the Otcujn Museum. 495 



Chert. — Wailiola. 



Of the colour of yellow-ocbre ; cavities lined with bluish-coloured quartz 

 and chalcedony ? The translucent grey portions, when heated in a closed 

 tube, decrepitate somewhat, give off water, a slight white sublimate and 

 fumes of sulphurous acid ; does not blacken ; the ochre-coloured portions 

 give off water, a slight sublimate similar to the last is formed, and an 

 empyreumatic odoiir is evolved ; the residue blackens (but finally burns to 

 a reddish-brown, due to the presence of iron oxide), and the condensed 

 water has a strongly alkaline reaction, all of which tend to indicate that 

 organic matter is present. The hardness of the ochre-coloured part is 

 greater than that of the grey portion, the former being about 6-5, and the 

 latter not more than about 5' 5. 



The blue-grey portion appears to be a film of chalcedony (or hyalite) 

 coating small and imperfect quartz crystals. 



Carnelian. — Coromandel. 

 Two specimens of reddish-brown carnelian or chalcedony, but wanting 

 XDurity of colom- and translucency. 



Carnelian. — Coromandel. 



Colourless, transparent carnelian. 



Hardness only about 5*5. Heated in closed tube the specimen gives ofi' 

 a trace of water, having an alkaline reaction, and evolves a faint empyreu- 

 matic odour ; conchoidal fracture with vitreous lustre. 



Flint. — Tapanui. 



A brown-coloured water-worn nodule, closely resembling the flint from 



the chalk of England. 



Flint. — Wangarei Heads. 



Water- worn nodule, variegated grey and white colour, somewhat 



fissured. Unlike the chert from Amuri Bluff it does not effervesce with 



acids. 



Chert. — Otago. 



Of a pale green colour. 



Chert. — Otago. 



Possessing an impui'e lavender colour. 



Jasper. — Clutha. 

 Portion of a waterworn nodule, sliced and pohshed ; of a pale green 

 colour, streaked with darker shades ; fissured, showing " faults " which are 

 made plainly visible by the bands of darker colour. 



Green Jasper. — Moeraki. 

 Variegated with reddish-brown streaks ; a little chalcedony on one 

 surface. The green colour is mainly due to the presence of protoxide of 

 u'on ; there is also manganese present in small quantity. On heating in a 



