Cox.—On the Mineralogy of New Zealand. 881 
Calcite.— Thames. The terminal end of a large sealenohedron on which 
an incrustation of small rhombohedral erystals has formed. 
Calcite with Aragonite.—Seacliff, near Waikouaiti. A number of small 
obtuse rhombohedrons built up, one.on the other, giving the whole crystal 
the appearance of a hexagonal prism with serrated edges, and with terminal 
rhombohedral planes. It is in a cavity in basalt. 
Calcite.—Geacliff. A similar specimen to the last, but less perfect. 
Calcite.—Cape Rodney. A block of white rhombohedral crystals of 
large size. 
Smoky Calcite——Cape Rodney. A slab of beautiful rhombohedral 
crystals of calcite of a smoky colour. 
Calcite (Dogtooth Spar).—Tararu Creek, Thames. A large slab of 
breccia with acute rhombohedral crystals of a pale yellow colour on the 
face. 
Massive Crystalline Calcite.—In this form calcite is of common occur- 
rence as veins traversing many different sorts of rocks. It notably occurs 
in the slate of the Tokatea Range at Coromandel, and in the mines of the 
Thames, where, owing to its decomposition in contact with acids, the car- 
bonie acid gas is formed which is found in such large quantities at the lower 
levels of the mines, sometimes rendering futile all attempts at ventilation. 
It is also frequently met with as large veins in the Maitai limestone of lower 
carboniferous age both in Nelson and Otago, and again associated with the 
crystalline marbles of the West Coast and Collingwood. It has also been 
found, under most interesting circumstances, in some of the granites of the 
West Coast Sounds, where it occurs as large rhombohedral masses entering 
into the composition of the rock as an accessory mineral. 
Marble.—Some very fine deposits of marble occur in New Zealand, in 
Caswell and Milford Sounds on the West Coast, as mentioned by Dr. 
Hector (Report of Explorations of West Coast of Otago, ‘ Provincial 
Gazette” and Jurors’ Rep. N.Z. Ex., 1865, p. 8), and in the former 
locality a quarry has been opened out by a newly-formed company. The 
better varieties are of a pure white colour and saccharine texture; they are 
reported by Mr. McKay to occur moderately free from joints, and to be 
obtainable in large blocks (Geol. Rep., 1880-81, p. 115). There is also 
a coarser crystalline variety, as well as a black-veined marble, which occurs 
in considerable quantities. Marble of good quality again occurs at Colling- 
wood and on the Riwaka Range between Takaka and Motueka, and 
a crystalline limestone, frequently called marble, is also found associated 
with the lower carboniferous rocks, and is met with in Nelson; the 
Blue Mountains, near Palmerston, Otago; and in the Clent Hills, 
Canterbury. 
