Lrverstper.—On some of the N. Z. Minerals in the Otago Museum. — 495 
Chert.—Waihola. 
Of the colour of yellow-ochre; 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 odour 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 
purity of colour and translucency. 
Carnelian.—Coromandel. 
Colourless, transparent carnelian. 
Hardness only about 5-5. Heated in closed tube the specimen gives off 
a trace of water, having an alkaline reaction, and evolves a faint empyreu- 
matic odour ; conchoidal fracture with vitreous lustre. 
Flint.—Tapan 
À brown-eoloured water-worn nodule, ilosely 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 impure lavender colour. 
Jasper.—Clutha. i 
Portion of a waterworn nodule, sliced and polished; 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 chaleedony on one 
surface. The green colour is mainly due to the presence of protoxide of 
iron ; there is also manganese present in small quantity. On heating in a 
