278 
MINERAL CENSUS OF AUSTRALASIA. 
Jasper | |—Coromandel, abundant in volcanic and porphy- 
ritic rocks (Hector) ; Snowy Range, as porcelain jasper 
(Haast) ; Auckland, in tuffs and conglomerates (Hoch- 
stetter). 
Agate Jasper | !|—Coromandel, in trachytic tuffs (Hector). 
Plasma | '!—Mount Somers and Gawler Downs, filling fissures 
in tertiary quartzose trachyte (Haast); Moeraki and 
Otepopo, in volcanic rocks (Hector). 
Potato Stone or Geode |! !—Snowy Ranges (Haast). 
Pearl Sinter | |—Rotorua. 
Prase !|— Gawler Downs, as small deposits in quartzose 
porphyritic trachytes (Haast, 1865). 
Rock Crystal! !!—Tamata, Kereru, Napier, Taupo, Canter- 
bury, Milford Sound, in metamorphic schists, and derived 
from rhyolitic rocks (Lab. and Geol. Reports). 
Silicious Sinter | |! — Orakeikorako, surrounding thermal 
springs (Hochstetter) ; Te Tarata, in terraces. 
Siderite | |—Mongonui, in cover of brown coal beds (Hector, 
1866). 
Tridymite | |—Lyttleton Harbour, in trachytic rocks (Ulrich). 
RETINITE, or AMBRITE ! !—Hyde, Caversham, Tuapeka, Waita- 
huna, Dunstan, Bay of Islands, occurs as masses of 
altered kauri gum in brown coals. First mentioned 
by Hochstetter, also Hector (Geol. and Lab. reports). 
Mean of three analyses by Richard Maly :— 
Carbon ote wet ose LOGE 
Hydrogen ... Sia «- Uae 
Oxygen i fe .. WDB 
Ash is tos ia “19 
100-00 
RHODONITE, or MANGANESE Spar!— Canterbury, Kawarau, 
Clutha, Dunstan, Waiheke, as veins in schists and as 
rolled fragments in alluvial drifts (Haast, 1865). 
Analysis (Skey.) 
Silica Ba Shr ede 15240) 
Sesquioxide of iron... we SORT O 
Protoxide of iron Ko ste 1-20 
Protoxide of manganese ont SESS 
Alumina... ae Das 7:20 
Copper ste ee ... traces 
Lime ot — ae 3°02 
Magnesic aide ie cre 3°00 
W ae (constitutional) _ 1:43 
