{"id":14875,"date":"2018-08-21T18:32:50","date_gmt":"2018-08-21T23:32:50","guid":{"rendered":"http:\/\/www.henryhartley.com\/?p=14875"},"modified":"2018-08-27T21:40:09","modified_gmt":"2018-08-28T02:40:09","slug":"calcite-crystal","status":"publish","type":"post","link":"https:\/\/www.henryhartley.com\/?p=14875","title":{"rendered":"Calcite Crystal"},"content":{"rendered":"<div id=\"attachment_14877\" style=\"width: 360px\" class=\"wp-caption alignright\"><a href=\"http:\/\/www.henryhartley.com\/wp-content\/uploads\/2018\/08\/img_20180821_157774.jpg\"><img aria-describedby=\"caption-attachment-14877\" loading=\"lazy\" src=\"http:\/\/www.henryhartley.com\/wp-content\/uploads\/2018\/08\/img_20180821_157774-350x233.jpg\" alt=\"Calcite Crystal\" width=\"350\" height=\"233\" class=\"size-medium wp-image-14877\" data-wp-pid=\"14877\" srcset=\"https:\/\/www.henryhartley.com\/wp-content\/uploads\/2018\/08\/img_20180821_157774-350x233.jpg 350w, https:\/\/www.henryhartley.com\/wp-content\/uploads\/2018\/08\/img_20180821_157774-768x512.jpg 768w, https:\/\/www.henryhartley.com\/wp-content\/uploads\/2018\/08\/img_20180821_157774-1024x683.jpg 1024w, https:\/\/www.henryhartley.com\/wp-content\/uploads\/2018\/08\/img_20180821_157774-800x533.jpg 800w, https:\/\/www.henryhartley.com\/wp-content\/uploads\/2018\/08\/img_20180821_157774-600x400.jpg 600w, https:\/\/www.henryhartley.com\/wp-content\/uploads\/2018\/08\/img_20180821_157774.jpg 1800w\" sizes=\"(max-width: 350px) 100vw, 350px\" \/><\/a><p id=\"caption-attachment-14877\" class=\"wp-caption-text\">Calcite Crystal<\/p><\/div>\n<p>In the process of going through things at mom&#8217;s, I spent some time looking through a bunch of rock. I&#8217;m not sure what it is about rocks and our family, but it seems we all have a rock collection of some description. Mom also had some rocks and minerals that had been her fathers, including this large calcite crystal. A large section of the crystal is opaque but the left side as shown here is mostly transparent. Calcite crystals have an interesting optical property called birefringence, that is, they have a double refraction, causing two images of any items viewed through the crystal. As you can see here, the word Library (on a Modern Library copy of <em>The Aeneid<\/em>) is duplicated when viewed through the crystal.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>In the process of going through things at mom&#8217;s, I spent some time looking through a bunch of rock. I&#8217;m not sure what it is about rocks and our family, but it seems we all have a rock collection of some description. Mom also had some rocks and minerals that had been her fathers, including &hellip; <a class=\"read-excerpt\" href=\"https:\/\/www.henryhartley.com\/?p=14875\">Continue reading <span class=\"meta-nav\">&raquo;<\/span><\/a><\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[6],"tags":[884,880,881,882,883,511,885],"_links":{"self":[{"href":"https:\/\/www.henryhartley.com\/index.php?rest_route=\/wp\/v2\/posts\/14875"}],"collection":[{"href":"https:\/\/www.henryhartley.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.henryhartley.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.henryhartley.com\/index.php?rest_route=\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.henryhartley.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=14875"}],"version-history":[{"count":2,"href":"https:\/\/www.henryhartley.com\/index.php?rest_route=\/wp\/v2\/posts\/14875\/revisions"}],"predecessor-version":[{"id":14878,"href":"https:\/\/www.henryhartley.com\/index.php?rest_route=\/wp\/v2\/posts\/14875\/revisions\/14878"}],"wp:attachment":[{"href":"https:\/\/www.henryhartley.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=14875"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.henryhartley.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=14875"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.henryhartley.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=14875"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}