It is the chief source of the element arsenic.
Comets, which by some estimates are about 18% carbon by weight, are a major source of the element.
Isotope ratios may therefore be used to trace the origin, or source, of the element in question at the time it enters the body.
This population of SNe is the major source of the element iron (Iwamoto et al, 1999) and may be the source of iron dust (Calura et al., 2008).
Lepidolite contains between 0.3% and 3.5% rubidium, and is the commercial source of the element.
Portugal, as the main European source of the element, was put under pressure from both sides, because of its deposits of wolframite ore at Panasqueira.
The mushrooms are a good source of the element vanadium, shown in a 2007 study to be present at a concentration of 0.142 mg/kg (dry weight).
Today, some cobalt is produced specifically from various metallic-lustered ores, for example cobaltite (CoAs S), but the main source of the element is as a by-product of copper and nickel mining.
On the other hand, the fast flow source of the ELEMENT GD permits higher currents (up to 90 mA in contrast to 10 mA for VG9000) and higher argon gas flows leading to more effective sample sputtering [ 25].
Since all the sample cross-sections were ion-milled, smearing from other paint layers is ruled out as the source of these elements.
