{"id":233629,"date":"2024-11-22T17:07:37","date_gmt":"2024-11-22T16:07:37","guid":{"rendered":"https:\/\/stapelvanstenen.nl\/acquisition-of-the-month-japanese-twins-of-quartz\/"},"modified":"2025-11-26T10:34:48","modified_gmt":"2025-11-26T09:34:48","slug":"acquisition-of-the-month-japanese-twins-of-quartz","status":"publish","type":"post","link":"https:\/\/stapelvanstenen.nl\/en\/acquisition-of-the-month-japanese-twins-of-quartz\/","title":{"rendered":"Acquisition of the month: Japanese twin quartz"},"content":{"rendered":"\n

I recently added a fine specimen of a Japanese-law quartz twin<\/strong> to my collection from the Ambolo Quartz Mine in Madagascar. This crystallographic peculiarity is formed by two quartz crystals fusing together as contact twins<\/strong> at an angle of exactly 84\u00b033′<\/strong>. What makes these twins so unique is that the two crystals remain individually identifiable, which is rare for quartz twins. <\/p>\n

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Most common forms of twin growth in quartz, in the first two examples the twins are fused into 1 crystal, but in Japanese twins the two crystals remain individually recognizable<\/em><\/figcaption><\/figure>\n<\/div>
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Japanese twin quartz (53 mm wide, 8 mm thick; 38 g) with hematite inclusions,<\/em>Ambolo quartz mine, Marososona, Antsirabe II District, Vakinankaratra, Madagascar.<\/em><\/figcaption><\/figure>\n<\/div>\n

In a Japanese twin, two of the prism faces (sides of the prism) of both crystals are parallel, usually resulting in a distinctive V-shape<\/strong> or, as in my specimen, a heart-shaped silhouette. Often these twins look flatter and may also appear almost square or slightly asymmetrical, but the typical V often remains clearly visible, as do the 6 faces that form the point in quartz. My specimen, with its soft pink hue due to hematite inclusions<\/strong>, is a beautiful example of this rare growth form. <\/p>\n

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\"quartz<\/figure>\n<\/div>\n

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Want to know more about growth forms of quartz, such as Japanese twins? In my online mini-course on growth forms of quartz<\/a><\/strong> you will discover how these phenomena occur and learn to recognize them better. A must for every lover of quartz crystals! <\/p>\n\n

<\/p>\n\n

\"Mini-Course-Growing-Forms-of-Quartz\"<\/a><\/figure>\n","protected":false},"excerpt":{"rendered":"

I recently added a fine specimen of a Japanese-law quartz twin to my collection from the Ambolo Quartz Mine in Madagascar. This crystallographic peculiarity is…<\/p>\n","protected":false},"author":4,"featured_media":233622,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[728,739],"tags":[1803,741],"class_list":["post-233629","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-for-the-enthusiast","category-written-in-stone-post","tag-japanese-twins","tag-quartz",""],"jetpack_featured_media_url":"https:\/\/stapelvanstenen.nl\/wp-content\/uploads\/2024\/11\/IMG_8218-scaled.jpeg","_links":{"self":[{"href":"https:\/\/stapelvanstenen.nl\/en\/wp-json\/wp\/v2\/posts\/233629","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/stapelvanstenen.nl\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/stapelvanstenen.nl\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/stapelvanstenen.nl\/en\/wp-json\/wp\/v2\/users\/4"}],"replies":[{"embeddable":true,"href":"https:\/\/stapelvanstenen.nl\/en\/wp-json\/wp\/v2\/comments?post=233629"}],"version-history":[{"count":1,"href":"https:\/\/stapelvanstenen.nl\/en\/wp-json\/wp\/v2\/posts\/233629\/revisions"}],"predecessor-version":[{"id":241461,"href":"https:\/\/stapelvanstenen.nl\/en\/wp-json\/wp\/v2\/posts\/233629\/revisions\/241461"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/stapelvanstenen.nl\/en\/wp-json\/wp\/v2\/media\/233622"}],"wp:attachment":[{"href":"https:\/\/stapelvanstenen.nl\/en\/wp-json\/wp\/v2\/media?parent=233629"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/stapelvanstenen.nl\/en\/wp-json\/wp\/v2\/categories?post=233629"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/stapelvanstenen.nl\/en\/wp-json\/wp\/v2\/tags?post=233629"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}