. Transactions and proceedings of the New Zealand Institute . f tungsten also afford excellent pigments, and discovered as early as 1863 that in many cases it could be used as asubstitute for tin, notably in the manufacture of Purple of Cassius. Theblack oxide of tungsten has been proposed as a substitute for its weight, this mineral is frequently found as an associate of gold inalluvial workings, and is known by the diggers as White Maori. Molybdenum. Molybdenite, Mo.—Specimens of this mineral occurring as flakes ina gneiss rock from Dusky Sound, were forwarded by Mr. W
. Transactions and proceedings of the New Zealand Institute . f tungsten also afford excellent pigments, and discovered as early as 1863 that in many cases it could be used as asubstitute for tin, notably in the manufacture of Purple of Cassius. Theblack oxide of tungsten has been proposed as a substitute for its weight, this mineral is frequently found as an associate of gold inalluvial workings, and is known by the diggers as White Maori. Molybdenum. Molybdenite, Mo.—Specimens of this mineral occurring as flakes ina gneiss rock from Dusky Sound, were forwarded by Mr. W. Docherty foridentification early in 1880, but very little of it has as yet been found. It is used for the preparation of blue carmine for colouring porcelain. Wulfenite, Pb Mo.—A specimen of this mineral is in the Museumlabelled as coming from the Dun Mountain, but I am unable to find anyaccount of how it was received. It was called Mimetesite. It occurs as crystals of a flat tabular form, belonging to the TetragonalSystem, which are sometimes consisting of (1) ooP,OP ; (2) i P,OP ; (3) ooPoo , OP, i P. In colour it varies from wax-yellow to greyish-yellow ; it has a hard-ness of about 3. Yields a metallic bead of lead on charcoal, decrepitatesviolently and colours a bead of phosphoric acid greenish blue. Its occurrenceis interesting, this being the first mention of it in New Zealand. Cheomium. Chromite (Fe, Mg) (^^ ,j\!i=(EO,E203).—This mineral which consistsessentially of a combination of ferrous oxide and chromic oxide with vari-able quantities of magnesic oxide, alumina and silica, is largely representedin New Zealand. It has chiefly been found in the District of Nelson, whereat the Dun Mountain it was for sometime extensively worked, about 5,000tons of the ore having been exported. It was first brought into notice byMr. T. E. Hacket who also in 1861 opened a mine in Aniseed Valley in thesame district (Jurors Eep. Ex., 1865, p. 18). It occiu^s in vario
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