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SARAWAK MINERALS.—BY J. S. GEIKIE. 
wak in the south, and from here it may be traced in a 
more or less interrupted band extending to the head 
waters of the Limbang River in the North. 
Siderite. —Frequently found in small grains in the 
cave alluvials of Upper Sarawak. 
Malachite and Azurite. —These Carbonates of Copper 
were included by A. H. Everett in his list of Sarawak 
Minerals, as is also : — 
Cerussite. —The Carbonate of Lead. 
Silicates, 
felspar. Schorl. 
Hype rsthene. Muscovite. 
Augite. Biot ite. 
Hornblende. Olivine. 
Epidote. 
The above Silicates have only been detected as 
constituent or accessory minerals in the various igneous 
and altered sedimentary rocks, and call for no further 
comment. 
Zircon. —Common in all the alluvials, particularly so 
in some of the limestone cave deposits, where it is 
generally associated with Garnets and Gold. It occurs 
in perfect crystals of microscopic size. 
Garnet. —Garnets have been observed in some of the 
dykes traversing limestone ; they are very small, as are 
also those found in the Alluvial deposits. 
Talc. —A common mineral especially in the brecciated 
shales and marls of Upper Sarawak ; it is always of the 
massive foliated type, never crystalline. 
Phosphates. 
Wavellite. —Some large masses of a beautiful blue 
colour were found lining a cavity in gold ore at Bau. 
In its white form it is fairly common. 
Apatite. —An accessory mineral of some dyke rocks 
and altered marls. 
Arsenates. 
Scorodite. — An Arsenate of Iron found in amorphous 
lumps in clay at Puak, Upper Sarawak. 
Anti mon ate s. 
Bindheimite. — Antimonate of lead. 
Occurs as an incrustation, or amorphous. A result 
of the decomposition of other Antimony ores. 
