. Bulletin - New York State Museum. Science. 128 NEW YORK STATE MUSEUM TUNGSTATES. MOLYBDATES Wolframite (wolfram) (Fe,Mn)W04 Wolframite is a tungstate of iron and manganese in which these metals are present in varying amounts. The crystals are monoclinic, of the general type shown in fig. 247. These are commonly tabular A-r^A. parallel to the orthopinacoid; also prismatic. Twins are quite frequent; granular or columnar masses also occur. Perfect cleavage parallel to the clinopinacoid is characteristic as well as part- ing planes parallel to the orthopinacoid and hemi- orthodome. The color is
. Bulletin - New York State Museum. Science. 128 NEW YORK STATE MUSEUM TUNGSTATES. MOLYBDATES Wolframite (wolfram) (Fe,Mn)W04 Wolframite is a tungstate of iron and manganese in which these metals are present in varying amounts. The crystals are monoclinic, of the general type shown in fig. 247. These are commonly tabular A-r^A. parallel to the orthopinacoid; also prismatic. Twins are quite frequent; granular or columnar masses also occur. Perfect cleavage parallel to the clinopinacoid is characteristic as well as part- ing planes parallel to the orthopinacoid and hemi- orthodome. The color is a dark grayish or brown- ish black and the luster is submetallic. Wolframite occurs associated with tin ores and other metal- lic minerals notably in the Cornwall and German mines. It is also found in New South Wales and Bolivia and in Connecticut, North Carolina. Missouri and Dakota. It is used in the manufacture of tungsten steel and as a source of the tungsten salts, which are of considerable importance in dyeing. „ , J tt Scheelite CaW04 Scheelite is a calcium tungstate crystallizing in the pyramidal class of the tetragonal system. The crystals are pyramidal in habit (fig. 248), more rarely tabular. These often occur in drusy crusts. The color is white or light shades of yellow, brown, red, rarely green. The luster is vitreous tending to adamantine. Scheelite occurs in crystalline rocks associated with cas- siterite, fluorite, topaz, apatite, molybdenite or wolframite, in- crusting or in quartz, and sometimes associated with gold. It is of comparatively rare occurrence but is found at Monroe and Trumbull Ct. and in South Carolina, Nevada, Idaho and Colorado. ,„ , Wulfenite PbMoO, Wulfenite is a lead molybdate crystallizing in the pyramidal class of the tetragonal system. The crystals are commonly thin tabular in habit of the general type shown in fig. 249; octahedral or prismatic forms are much. Please note that these images are extracted from scanned page images that m
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