% 
Pa 
244 MINERALS FROM NEW CALEDONIA. 
Hornblende.—In the form of black and fibrous schistose ma 
associated with white silvery mica and minute garnets, the three 
in alternating layers. From the Balade mine. 
yroxene or Augite—A rolled nodule, made up of confused 
masses of crystals. From Tonsjete Bay. . 
Glaweophane.—This rare variety of hornblende seems to be 
abundant in the neighbourhood of the Balade mine, as Mr. 8 
collection contained several specimens some of which differ in 
colour, structure, and general appearance. 
one specimen is crystallized ; the crystals are in the form of 
dark blue-grey silky-looking prisms, seated upon a base of a mica- 
ceous schist, composed of mica, glaucophane, and garnets, with 
some quartz. : 
The prisms are about 4 inch in diameter and from $ to } inch 
long ; they present no distinct faces, both the lateral and ter 
faces being more or less rounded ; the prisms are in fact mere 
pundles of lamellar or capillary crystals. Some of the prisms are 
completely isolated from the rest, whilst others are more or Jess 
interlaced and superimposed. ; 
All the other specimens are massive, with a fibrous crystalline 
structure, of a peculiar violet colour, passing into a dark slaty blue 
on the one hand, and into a pale greyish colour on 
lighter violet varieties have a very beautiful silky Iu 
streak is of a pale bluish grey. Before the blowpipe it fuses, of 
tumesces slightly, colours flame yellow, yields a dark glass; eae 
sodium carbonate yields indications of manganese. Partly solu 
in acids) H=6-7. 3 
This occurrence of glaucophane is of considerable interest, ag 
it has hitherto only been met with in the Island of Syra, one 
the Grecian Islands, and at Zermatt. ; ‘pl 
At Syra it is found associated with garnet, hornblende, 
mica, in a mica-slate. The New Caledonia mineral is also 
ciated with garnet and mica, in fact it forms in some cases ©” 
matrix of these minerals. sen te 
On analysis it was found to have the following composition * 
Analyses. 
L II. er 
MRO ia cea A i scenes 1°42 1:34 52°79 : 
Silica 52°71 5288 gad 
NINA sic i dive daesscrnweyesesee 14:20 14°69 982 
Tron protoxide ........ 0.008 89 9°76 traces 
Manganese «.......:.-.sessenevenee traces traces 4:29 
ime 4°31 421 ne 
Magnesia 11°12 1992 ae 
Potash ...... 95 ns 526 
NS 515 ce ee 
—— 99°98 
Sp. gr. 3:12. 
