Leaching of Fluoride from Biotite Mica in Soil: Implications for Fluoride in Shallow Groundwater

<table>XRD pattern of fresh biotite treated with (a) untreated fresh biotite, (b) highly weathered biotite treated with distilled water, (c) HNO<sub>3</sub> acid, and (d) citric acid. Note: N: new peaks, S: shifted peaks.</table>

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Figure 2

Figure 2: Leaching of Fluoride from Biotite Mica in Soil: Implications for Fluoride in Shallow Groundwater 