MINERAL OCCURRENCES AT DUSKY SOUND. 311 
appeared of interest to solve the question as to which species the 
mineral really belonged to by a quantitative analysis. ‘This was 
executed, under the direction of Professor Black, by Mr T. 
Butement, a student of the School of Mines, and gave the fol- 
lowing results :— 
SiO; - : - 24.81 
web, O; - - 28.89 
Be-O - - - 227, 
Mg O - - e238 
EE. O - - - 10.18 
Total, 99.28 
On comparing these results with those given for prochlorite 
in Dana’s System of Mineralogy, the identity of the Dusky Sound 
mineral with this species is unquestionable. 
Menaccanite (Z7ztanzferous tron) Var. Ilmenite——This mineral 
is abundantly impregnated in the just described chlorite rock 
as thin scales and in plates up to several centim. in diameter 
and several mm. thick, but generally thinning out towards the 
margin. It occurs in consequence plentifully distributed through 
the detritus derived from the degradation of the rock. Larger 
plates are mostly curved lamellz, and generally show fine stria- 
tions on the broad lustrous black surfaces which are not, how- 
ever, connected with any cleavage across the plates. Determin- 
able crystal planes are not observable. The ore gives a black 
streak powder, and very slightly affects the magnetic needle. 
Spec. grav. 4.835. Before the blowpipe it imparts to the micro- 
cosmic salt bead in the reduc. flame a deep, brownish-red colour, 
and affords also on fusion with soda and saltpetre on platinum foil 
reaction for manganese. According to a partial analysis by Mr. 
Butement, it contains from 45-50/ of Tio,,an amount which would 
place it under the variety //menite. This ore was evidently of 
primary formation in the chlorite rock, and to its decomposition is 
no doubt in part due the origin of the mineral next to be described. 
Titanite, var. Sphene—Mr. Docherty discovered this species 
(which has not before been recorded as found in New Zealand) 
whilst prospecting the chlorite rock at the beach of Dusky 
Sound. It occurs, as he states, pretty abundantly in the cavities 
of the rock, forming thin tabular crystals up to 7 mm. in size, yel- 
lowish, white opaque, and subtransparent oil-green in colour and 
which are mostly grown up on edge, sometimes so close together 
as to form a regular drusy coating, such as obtuse rhombohedra 
of calcite (Nailhead Spar) often show. They are, however, 
throughout very ill-defined. The best crystal I could find in Mr. 
Docherty’s first !ot of specimens has the form shown in Fig. 4, in 
which according to Naumann’s position o. would be the basal 
pinacoid oP(Oo!), p. the prism oP(io1), x. the orthodome % 
Poo(102), and y. the orthodome Po(1o1); these determina- 
tions being based upon some fair measurements of angles I was 
enabled to make on the crystal with the reflecting goniometer. 
Amongst the specimens Mr Docherty brought from his last trip 
