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Hopper crystal
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<h2 id="external-links">External links</h2> <ul><li><a href="https://web.archive.org/web/20120204034724/http://www.gc.maricopa.edu/earthsci/imagearchive/bismuth.htm">Images of hopper crystals, Glendale Community College Earth Science Image Archive</a></li></ul> <h2 id="references">References</h2> <ol> <li id="fn:1"><p>US 10881123 <a href="https://worldwide.espacenet.com/textdoc?DB=EPODOC&IDX=US10881123" target="_blank">https://worldwide.espacenet.com/textdoc?DB=EPODOC&IDX=US10881123</a> <a href="#fnref:1" class="footnote-back-ref">↩</a></p></li> </ol>