WVGES Trace Elements in West Virginia Coals

Click Here To Go To Trace Elements Framed Home PageRubidium (Rb) Summary Statistics

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Rubidium shows a histogram skewed to lower values with a significant tail of higher values and a mean whole coal Rb of 23.62 ppm (± 21.13 ppm) in West Virginia coals.  A maximum value of 161.0 ppm was found in a bench of the Stockton coal.  Rubidium correlated moderately with ash yield, very highly with cesium (Cs), and moderately to slightly with ash related elements such as chromium (Cr), vanadium (V), scandium (Sc), samarium (Sm), gallium (Ga), thorium (Th), tellurium (Te) and lithium (Li).  Rubidium also slightly correlated with rare earth elements present in monazite, especially cerium (Ce), lanthanum (La) and lutetium (Lu).  The high correlation with Cs is suspect, but Cs is known to occur in nature in close association with Rb because of their similar atomic radii, for example in the mineral pollucite (CsAlSi2O6) which has never been documented in coal, but these two elements most likely substitute for potassium (K) in clay minerals.
Spearman Correlation Coefficients (r) with Rubidium
Ash Yield
n = 403
n = 403
n = 403
n = 403
n = 403
n = 120
n = 403
n = 399
n = 105
n = 120
n =120
n = 403
n = 120
Go to Stratigraphic Distribution of RubidiumGo to Rubidium State MapGo to General Elements PageGo to All Elements Summary Statistics Table
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