February 1743 in Saint-Just-en-Chauss\u00e9e on the Oise; \u2020 June 3, 1822 in Paris<\/p>\n\n\n\n
<\/p>\n\n\n\n
He was a French mineralogist. The mineral Ha\u00fcyn is named after him.<\/p>\n\n\n\n
In 1804 he was elected a member of the Royal Prussian Academy of Sciences; from 1812 he was an honorary member.<\/p>\n\n\n\n
In 1809 he became a corresponding member of the Royal Dutch Academy of Sciences and in 1818 a member of the Royal Society. He was an honorary member of the Russian Academy of Sciences in St. Petersburg and the Royal Society of Edinburgh.<\/p>\n\n\n\n
Ha\u00fcy described the symmetry law of crystallography. He dropped a crystal of calcite to the ground and discovered that the fragments had the same shape as the original crystal. From this he concluded that crystals are made up of smaller units that have the same shape as the crystal itself. He called these smaller units integrating molecules.<\/p>\n\n\n\n
Ren\u00e9-Just Ha\u00fcy with goniometer<\/p>\n\n\n\n
This experiment from 1784 gave rise to the law of rational indices, according to which every crystal surface can be described by three (usually small) integers. This law applies to almost all crystals with the exception of aperiodic crystals. He also made discoveries about pyroelectricity.<\/p>\n\n\n\n
Ha\u00fcy is immortalized by name on the Eiffel Tower. He can be found under 72 names on the Eiffel Tower.<\/p>","protected":false},"excerpt":{"rendered":"
February 1743 in Saint-Just-en-Chauss\u00e9e on the Oise; \u2020 June 3, 1822 in Paris He was a French mineralogist. The mineral Ha\u00fcyn is named after him. In 1804 he was elected a member of the Royal Prussian Academy of Sciences; from 1812 he was an honorary member. In 1809 he became a corresponding member of the Royal Dutch Academy of Sciences and in 1818 [...]<\/p>","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_breakdance_hide_in_design_set":false,"_breakdance_tags":"","footnotes":""},"categories":[1],"tags":[],"class_list":["post-278","post","type-post","status-publish","format-standard","hentry","category-unkategorisiert"],"acf":[],"_links":{"self":[{"href":"https:\/\/westgem.shop\/en\/wp-json\/wp\/v2\/posts\/278","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/westgem.shop\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/westgem.shop\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/westgem.shop\/en\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/westgem.shop\/en\/wp-json\/wp\/v2\/comments?post=278"}],"version-history":[{"count":0,"href":"https:\/\/westgem.shop\/en\/wp-json\/wp\/v2\/posts\/278\/revisions"}],"wp:attachment":[{"href":"https:\/\/westgem.shop\/en\/wp-json\/wp\/v2\/media?parent=278"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/westgem.shop\/en\/wp-json\/wp\/v2\/categories?post=278"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/westgem.shop\/en\/wp-json\/wp\/v2\/tags?post=278"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}