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Materials<br />
• Naturally weathered alkali feldspars from post-glacial<br />
soils<br />
• Shap (north-west England)<br />
– Acidic (pH 3.4) & waterlogged peat.<br />
Grain surfaces free of weathering<br />
products.<br />
• Glen Feshie (Cairngorm, Scotland)<br />
– Soil chronosequence (80 yr-1 kyr).<br />
Grain surfaces have abundant<br />
weathering products.