949 MINERALS FROM NEW CALEDONIA. 
Ankerite.—A. variety of this mineral of a pale brown colour was 
found by Mr. Pryor, at the Balade mine, associated with quartz 
and copper pyrites; breaks readily into more or less lamellar 
pieces ; contains manganese, as well as iron, lime, and magnesia, 
Magnesite.—In the massive form, white, very dense, hard, and 
breaking with a conchoidal fracture ; somewhat platy structure. 
A qualitative analysis shows it to be * very pure 
A concretionary variety was contained i n Mr. Rossiter’s col- 
lection, labelled ** Barytes from Boudisinili” but on testing 
barium none could be detected; the specimen had the same 
peculiarly reticulated surface and mamm millated form as the mag- 
nesite found on the New South Wales diamond fields. 
Garnet.—In some cases these are very well crystallized in the 
form of the rhombic dodekahedron, varying in size from #5 to § 
e, whilst others are 
of a rich more or less transparent red, similar to the varieties used 
for jewellery. 
The matrix is of two kinds ; the one is a hard and very heavy 
schistose rock, composed of quartz, glaucophane, and some epidote ; 
the other matrix is the rather uncommon variety of hornblende 
known as glaucophane. The faces of the larger rhombic dodeka- 
hedral crystals occurring in the glaucophane matrix are, as it wer® 
built up of plates, so that the eda of the garnets would present, 
if cut through, a step-like sect: 
Usually each face of the garact crystal is covered or in con contact 
with a plate of mica ; these mica crystals sia exte = beyond the 
face of the garnet in ‘one or more directions. the garnet is 
detached, a mould of it isleft, beautifully lined Mer ae 
In some cases the garnets have crystallized in thin red films 
between the plates of mica ; in other places the solid garnet erystals 
penetrate right through the layers of mica. ; : 
An gers of the garnets was made with the following results: 
Sp. gr. 4 
Analyses. 
L I. Mean. 
Silica 3810... 821, ee 
umina 22°09 22°27 a 
DA PROSONIAD ooo Soi crssgsey 21°17 21°35 ert 
anese Gitte ..2s...6.iiecsciis 5°50 5°58 
7°88 768 
Magnesi 4°64 4°84 
Loss on Soudtion icons 0°33 0°29 
99°71 10022 
which gives the following formula :— 
3 (FeO, MnO, CaO, MgO), a 
