Lead glance

Lead glance Lead glass Lead heat stabilizers Lead hydrogen arsenate Lead hydroxide... 

In 1863 Reich began a search for thallium in some Freiberg zinc ores from the Himmelsfurst mine consisting mainly of arsenical pyrites, blende, lead glance, silica, manganese, copper, and small amounts of tin and cadmium (19, 43). After roasting the blende to remove most of the sulfur and arsenic, he decomposed it with hydrochloric acid (47). When Clemens Winkler, who was then a metallurgist in the Saxon smalt works, visited Professor Reich in 1863, the latter showed him a straw-yellow precipitate and said, This is the sulfide of a new element (52). Because of his colorblindness, however, Reich entrusted the spectroscopic examination to his assistant, Richter. 

Galena (Galenite or Lead Glance), PbS, mw 239.28 gr cubic crysts, sp gr 7.5, hardness 2.5, mp 1120° insol in w alkalies sol in coned nitric acid and in hoc hydrochloric. Occurs in many US States, Canada, So America, Africa, etc. Serves as a chief ore of lead... 

Arsenic occurs also in a great variety of other minerals, generally as mixed arsenides and sulphides of the heavy metals or as metallic arsenites and arsenates, anhydrous and hydrated. The more common of these are listed below, with their approximate composition. They are to be found in small quantities widely scattered over Europe,12 Asia, America and Australia. Thus arsenical minerals in great variety13 are found in the blendes and lead glances of the Eastern Alps, the former... 

The molybdenum story is not rich in events. It is even trivial. Only one detail is of interest this rare element was discovered very early, namely, in 1778, when the chemical analysis was just coming of age. Molybdenum was first separated in the form of oxide. The name molybdenum had appeared long before the new element was discovered. It originates from the Greek names molybdena for a lead mineral (lead glance) and molybdos for lead , the two resembling each other. There was another mineral which also resembled these two very much later it became known as molybdenite (molybdenum sulphide). 

Indium is present in sphalerite and galena (lead glance) regularly in parts-per-milHon quantities, but actual indium minerals are very rare. Ores with high indium contents (0.1-1%) are found in Bolivia, England (CornwaU) and Canada (Brunswick). The... 

Discovery Known since antiquity and used before 4000 BC. Most important mineral Galena, lead glance PbS (Figure M70)... 

Its crystals are cubic or octahedral. The mineral is bluish-gray, soft and heavy and has a shiny metallic luster. It is also called lead glance (Figure M70). 

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