<div class="description">
Boron (atomic symbol B), a naturally occuring Earth element, was first isolated by Sir Humphry Davy and Joseph Louis Gay-Lussac and Louis Jacques Thénard in 1808. Tourmaline is a boron silicate. Opaque and black in color, tourmaline is a semi-precious stone that can be found in a variety of colors based on the presence of iron, magnesium, or lithium. The dark color indicates this sample is rich in iron.</div>
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<ul><li><a rel="nofollow" class="external text" href="https://digital.sciencehistory.org/works/5m60qs54q">Record in source catalog</a></li>
<li>DPLA identifier: <a rel="nofollow" class="external text" href="https://dp.la/item/6ecb0a6b666e5d4e0e61dcd7b460b513">6ecb0a6b666e5d4e0e61dcd7b460b513</a></li>
<li>Science History Institute identifier: padig:SHI-5m60qs54q</li></ul></span>