Marshall. — Additions to List of Neiv Zealand Minerals. 107 



Corundum : A purplish-red variety, in crystals of moderate size, occurs 

 with green niuscovite in boulders in the sluicing-gravels at Rimu, near 

 Hokitika. 



Ilmenite : Typical crystals, but of microscopic size, occur in nepheline- 

 basanite of the Domain crater, Auckland. 



PiCOTITE (16). 



Magnetite (15) : A chrome variety occurs in hartzbergite, Milford Sound. 

 Small octahedrons are common in chlorite-schist, Otago. 



RuTiLE (16), (22). (28) : Microscopic crystals in granulites of south-west 

 Otago ; also in schists, Otago. 



Pyrolusite (23). 



TuRGiTE (20) : Occurs with limonite at Parapara. 



GOTHITE (20). 



PsiLOMELANE : Small nodules in decomposed scoria, Seaview, Dunedin. 



Dolomite (32) : Pearl-spar, in the May Queen Mine, Thames. 



Magnesite (15) : A decomposition product of enstatite in hartzbergite at 

 Milford Sound. 



Rhodocroisite (23). 



Arragonite : Pseudo-hexagonal crystals at Oamaru and Dunedin, in cavities 

 in volcanic rocks. 



Cerussite (6) : Tui and Pluvius Mines, Te Aroha. 



Orthoclase : Crystals with Baveno development, though not twinned, 

 occur porphyritically in the granite of Separation Point. The finer 

 portion of the groundmass disintegrates readily, and the crystals form 

 the sands and gravels of the beaches. The variety sanidine (5), (17), 

 is common in alkaline rocks, Dunedin. 



MiCROCLlNE (22) : In many granites, notably at Golden Bay, Stewart 

 Island ; Kahurangi Point and Dea's Cove, Thompson Sound. 



Albite, Oligoclase, ANDEf-ixE, Bytownite. and Anorthite : All of these 

 species are mentioned in various petrographical papers as occurring in 

 many rocks of igneous origin. No occurrences deserve any special 

 mention. 



Anorthoclase (17) : Abundant in many alkaline rocks at Dunedin. Also 

 at Campbell Island. 



Perthite (16), (17) : At Stewart Island and at Dunedin. 



Leucite : The locality mentioned by Hector in the list quoted was ap- 

 parently an error. Microscopic crystals occur in a leucitophyre at 

 Puketoraki, near Dunedin. 



Exstatite (15) : Very large crystals in a hartzbergite at Milford Sound; 

 also mentioned by Hutton in North Island volcanic rocks ; occurs also 

 at the North Cape, in a hartzbergite. 



Hypersthene (16), (19), (26), (27) : Hutton has mentioned the occurrence 

 of this mineral at Lake Taupo, where crystals washed out of pumice 

 form a })lack sand. Abundant in the volcanic region of the North Island, 

 and in norites at Milford Sound, especially in the gravels of the Cleddau 

 River and at the Bluff. 



Bronzite : This mineral has been referred to in geological reports on the 

 Dun Mountain, but it appears that diallage was mistaken foi- it. 



Bastite (25) : Noted l^y Hutton in a rock at the Dun Mountain, where it 

 is associated with diallage. Occurs also in a hartzbergite at the North 

 Cape. 



