MINERALS FROM NEW CALEDONIA. 241 
Quartz.—In the form of fragments of colourless and transparent 
rock crystal, also as vein quartz, both white and tinged with various 
colours from the admixture of impurities, also in the form of 
white pebbles cemented together with brown oxide of iron, and 
mixed with some more or less decomposed mica, similar in appear- 
ance to the conglomerate from the New England diamond drift ; 
collected by Mr. Pryor. 
Chalcedony.—In flat pieces as if set free from fissures, often 
white outside like chalk flints ; in colour various shades of brown 
and grey, also quite white as in carnelian. Collected by Mr. 
Rossiter, from Bouenoumala, Coumac. 
Chert.—Of various shades of grey through brown to black, and 
much fissured, from Pointe Nea (?), near Noumea, apparently 
reaks with the usual square 
system. 
lected by Mr. Rossiter, from near Port la Guerre, which were 
mostly massive cleavage fragments. Mr. Pryor’s collection from 
e Balade mine contained a few specimens crystallized in rhombo- 
hedra, and associated with small quartz erystals, taken from the 
joints of the mica-schist near to the deposits of copper ore. Also 
et apparently from the lode, intimately associated with copper 
pyrites. 
Another variety is of a pure white colour, breaking with a fine 
ine ture, and presenting much the appearance of 
alabaster, apparently derived from veins only a few inches across ; 
where stained with iron oxide resembles somewhat the celebrated 
gerian onyx marble. It apparently forms the vein stuff of 
certain portions of the copper veins. are 
Limestone.—Of a grey or dove colour, suitable for building or 
Pr imental purposes ; from the Baie de Eiyalion’ oumea, and 
a m near Coumac. Collected by Mr. Rossiter. ~ . Pryor - 
me specimens from an outcrop on the Didahot River, near 
the Balade mine Ra: : great extent of this 
