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Magnesium fluoride
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<p>Magnesium fluoride is an ionically bonded <a href="/facts/Inorganic_compound/TfFfzxSz">inorganic compound</a> with the <a href="/facts/Chemical_formula/hghUtthl">formula</a> <a href="/facts/Magnesium/XyIhd2FG">Mg</a><a href="/facts/Fluorine/YUV0Fb8m">F</a>2. The compound is a colorless to white crystalline <a href="/facts/Salt_(chemistry)/lsSKwGpn">salt</a> and is transparent over a wide range of <a href="/facts/Wavelength/kcJU0ymz">wavelengths</a>, with commercial uses in <a href="/facts/Optics/p0vq4S1T">optics</a> that are also used in <a href="/facts/Space_telescope/BtI46sDX">space telescopes</a>. It occurs naturally as the rare mineral <a href="/facts/Sellaite/UFXFXcoT">sellaite</a>. </p>