{"id":3197,"date":"2026-09-19T09:07:13","date_gmt":"2026-09-19T07:07:13","guid":{"rendered":"https:\/\/mineralien-weltweit.com\/product\/optical-calcite-jose-maria-patoni-mexico-cleavage-rhombohedron\/"},"modified":"2026-09-19T09:23:22","modified_gmt":"2026-09-19T07:23:22","slug":"optical-calcite-jose-maria-patoni-mexico-cleavage-rhombohedron","status":"publish","type":"product","link":"https:\/\/mineralien-weltweit.com\/en\/product\/optical-calcite-jose-maria-patoni-mexico-cleavage-rhombohedron\/","title":{"rendered":"Optical Calcite from Jos\u00e9 Mar\u00eda Patoni, Mexico \u2013 Clear Cleavage Rhombohedron"},"content":{"rendered":"

This optical Calcite from Jos\u00e9 Mar\u00eda Patoni near San Juan del R\u00edo in the Mexican state of Durango is a transparent to locally slightly milky cleavage piece showing the characteristic strong double refraction of Calcite. Lines and writing viewed through the specimen appear clearly doubled or displaced. <\/p>\n

Measuring 3.1 \u00d7 2.5 \u00d7 1.6 cm and weighing 34.5 g, this is a miniature specimen. The piece occurs as a typical cleavage rhombohedron, clearly demonstrating both the perfect rhombohedral cleavage and the pronounced optical properties of Calcite. <\/p>\n

Transparent optical Calcite with distinct double refraction<\/h3>\n

The Calcite is predominantly colorless and transparent. Marginal areas and individual zones appear slightly milky or are somewhat clouded by internal cleavage structures. <\/p>\n

Its most characteristic feature is the double refraction. When writing or lines are viewed through the Calcite, they appear clearly doubled due to the strong birefringence of the mineral. This optical effect is clearly visible in the product photographs. <\/p>\n

Natural cleavage planes, fine internal fractures and structural features are visible within the specimen. These are part of the natural internal structure of the Calcite. <\/p>\n

Cleavage rhombohedron of optical Calcite<\/h3>\n

Calcite has perfect rhombohedral cleavage. When the mineral is split along these natural cleavage directions, characteristic rhombohedral pieces are produced, commonly referred to as cleavage rhombohedra. <\/p>\n

The shape therefore should not be confused with the natural crystal habit of a freely grown Calcite crystal. It results from cleavage along the mineral’s natural planes and is particularly well suited to demonstrating its optical properties. <\/p>\n

Optical Calcite from Jos\u00e9 Mar\u00eda Patoni, Durango<\/h3>\n

The deposits of Jos\u00e9 Mar\u00eda Patoni (Menores de Arriba), San Juan del R\u00edo, Durango are well known for high-quality optical Calcite. Transparent Calcite from this locality has long been valued for its clarity and pronounced double refraction. <\/p>\n

This specimen combines a classic locality for optical Calcite with a clearly visible optical effect, making it both an interesting collector specimen and an excellent demonstration piece for the double refraction of Calcite.<\/p>\n

\n
\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
Feature<\/th>\nDetails<\/th>\n<\/tr>\n<\/thead>\n
Mineral<\/td>\nCalcite<\/td>\n<\/tr>\n
Variety \/ Designation<\/td>\nOptical Calcite<\/td>\n<\/tr>\n
Locality<\/td>\nJos\u00e9 Mar\u00eda Patoni (Menores de Arriba), San Juan del R\u00edo, Durango, Mexico<\/td>\n<\/tr>\n
Dimensions<\/td>\n3.1 \u00d7 2.5 \u00d7 1.6 cm<\/td>\n<\/tr>\n
Weight<\/td>\n34.5 g<\/td>\n<\/tr>\n
Size category<\/td>\nMiniature specimen<\/td>\n<\/tr>\n
Color<\/td>\nColorless to slightly milky<\/td>\n<\/tr>\n
Transparency<\/td>\nPredominantly transparent<\/td>\n<\/tr>\n
Luster<\/td>\nVitreous<\/td>\n<\/tr>\n
Specimen form<\/td>\nCleavage rhombohedron<\/td>\n<\/tr>\n
Cleavage<\/td>\nPerfect rhombohedral<\/td>\n<\/tr>\n
Optical property<\/td>\nClearly visible double refraction<\/td>\n<\/tr>\n
Internal Features<\/td>\nNatural cleavage planes and fine internal fractures<\/td>\n<\/tr>\n
Special Feature<\/td>\nDistinct double refraction<\/td>\n<\/tr>\n
Locality status<\/td>\nClassic locality<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"

This optical Calcite from Jos\u00e9 Mar\u00eda Patoni near San Juan del R\u00edo in the Mexican state of Durango is a transparent to locally slightly milky cleavage piece showing the characteristic strong double refraction of Calcite. Lines and writing viewed through the specimen appear clearly doubled or displaced. Measuring 3.1 \u00d7 2.5 \u00d7 1.6 cm and […]\n","protected":false},"featured_media":3194,"comment_status":"open","ping_status":"closed","template":"","meta":[],"product_brand":[],"product_cat":[351],"product_tag":[],"class_list":["post-3197","product","type-product","status-publish","has-post-thumbnail","product_cat-minerals","first","instock","sold-individually","shipping-taxable","purchasable","product-type-simple"],"yoast_head":"\nOptical Calcite from Jos\u00e9 Mar\u00eda Patoni, Mexico | Double Refraction<\/title>\n<meta name=\"description\" content=\"Transparent optical Calcite from Jos\u00e9 Mar\u00eda Patoni, Durango, with clearly visible double refraction. Cleavage rhombohedron, 3.1 cm.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/mineralien-weltweit.com\/en\/product\/optical-calcite-jose-maria-patoni-mexico-cleavage-rhombohedron\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Optical Calcite from Jos\u00e9 Mar\u00eda Patoni, Mexico | Double Refraction\" \/>\n<meta property=\"og:description\" content=\"Transparent optical Calcite from Jos\u00e9 Mar\u00eda Patoni, Durango, with clearly visible double refraction. Cleavage rhombohedron, 3.1 cm.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/mineralien-weltweit.com\/en\/product\/optical-calcite-jose-maria-patoni-mexico-cleavage-rhombohedron\/\" \/>\n<meta property=\"og:site_name\" content=\"mineralien-weltweit.com\" \/>\n<meta property=\"article:modified_time\" content=\"2026-09-19T07:23:22+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/mineralien-weltweit.com\/wp-content\/uploads\/2026\/09\/1-Doppelspat-Jose-Maria-patoni-durango-mexiko.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"1250\" \/>\n\t<meta property=\"og:image:height\" content=\"956\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data1\" content=\"2 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/mineralien-weltweit.com\\\/en\\\/product\\\/optical-calcite-jose-maria-patoni-mexico-cleavage-rhombohedron\\\/\",\"url\":\"https:\\\/\\\/mineralien-weltweit.com\\\/en\\\/product\\\/optical-calcite-jose-maria-patoni-mexico-cleavage-rhombohedron\\\/\",\"name\":\"Optical Calcite from Jos\u00e9 Mar\u00eda Patoni, Mexico | Double Refraction\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/mineralien-weltweit.com\\\/en\\\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\\\/\\\/mineralien-weltweit.com\\\/en\\\/product\\\/optical-calcite-jose-maria-patoni-mexico-cleavage-rhombohedron\\\/#primaryimage\"},\"image\":{\"@id\":\"https:\\\/\\\/mineralien-weltweit.com\\\/en\\\/product\\\/optical-calcite-jose-maria-patoni-mexico-cleavage-rhombohedron\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/mineralien-weltweit.com\\\/wp-content\\\/uploads\\\/2026\\\/09\\\/1-Doppelspat-Jose-Maria-patoni-durango-mexiko.jpg\",\"datePublished\":\"2026-09-19T07:07:13+00:00\",\"dateModified\":\"2026-09-19T07:23:22+00:00\",\"description\":\"Transparent optical Calcite from Jos\u00e9 Mar\u00eda Patoni, Durango, with clearly visible double refraction. Cleavage rhombohedron, 3.1 cm.\",\"breadcrumb\":{\"@id\":\"https:\\\/\\\/mineralien-weltweit.com\\\/en\\\/product\\\/optical-calcite-jose-maria-patoni-mexico-cleavage-rhombohedron\\\/#breadcrumb\"},\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\\\/\\\/mineralien-weltweit.com\\\/en\\\/product\\\/optical-calcite-jose-maria-patoni-mexico-cleavage-rhombohedron\\\/\"]}]},{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\\\/\\\/mineralien-weltweit.com\\\/en\\\/product\\\/optical-calcite-jose-maria-patoni-mexico-cleavage-rhombohedron\\\/#primaryimage\",\"url\":\"https:\\\/\\\/mineralien-weltweit.com\\\/wp-content\\\/uploads\\\/2026\\\/09\\\/1-Doppelspat-Jose-Maria-patoni-durango-mexiko.jpg\",\"contentUrl\":\"https:\\\/\\\/mineralien-weltweit.com\\\/wp-content\\\/uploads\\\/2026\\\/09\\\/1-Doppelspat-Jose-Maria-patoni-durango-mexiko.jpg\",\"width\":1250,\"height\":956,\"caption\":\"Transparent optical Calcite as a cleavage rhombohedron\"},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\\\/\\\/mineralien-weltweit.com\\\/en\\\/product\\\/optical-calcite-jose-maria-patoni-mexico-cleavage-rhombohedron\\\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Start\",\"item\":\"https:\\\/\\\/mineralien-weltweit.com\\\/en\\\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Shop\",\"item\":\"https:\\\/\\\/mineralien-weltweit.com\\\/en\\\/shop\\\/\"},{\"@type\":\"ListItem\",\"position\":3,\"name\":\"Optical Calcite from Jos\u00e9 Mar\u00eda Patoni, Mexico \u2013 Clear Cleavage Rhombohedron\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\\\/\\\/mineralien-weltweit.com\\\/en\\\/#website\",\"url\":\"https:\\\/\\\/mineralien-weltweit.com\\\/en\\\/\",\"name\":\"mineralien-weltweit.com\",\"description\":\"\",\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\\\/\\\/mineralien-weltweit.com\\\/en\\\/?s={search_term_string}\"},\"query-input\":{\"@type\":\"PropertyValueSpecification\",\"valueRequired\":true,\"valueName\":\"search_term_string\"}}],\"inLanguage\":\"en-US\"}]}<\/script>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"Optical Calcite from Jos\u00e9 Mar\u00eda Patoni, Mexico | Double Refraction","description":"Transparent optical Calcite from Jos\u00e9 Mar\u00eda Patoni, Durango, with clearly visible double refraction. Cleavage rhombohedron, 3.1 cm.","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/mineralien-weltweit.com\/en\/product\/optical-calcite-jose-maria-patoni-mexico-cleavage-rhombohedron\/","og_locale":"en_US","og_type":"article","og_title":"Optical Calcite from Jos\u00e9 Mar\u00eda Patoni, Mexico | Double Refraction","og_description":"Transparent optical Calcite from Jos\u00e9 Mar\u00eda Patoni, Durango, with clearly visible double refraction. Cleavage rhombohedron, 3.1 cm.","og_url":"https:\/\/mineralien-weltweit.com\/en\/product\/optical-calcite-jose-maria-patoni-mexico-cleavage-rhombohedron\/","og_site_name":"mineralien-weltweit.com","article_modified_time":"2026-09-19T07:23:22+00:00","og_image":[{"width":1250,"height":956,"url":"https:\/\/mineralien-weltweit.com\/wp-content\/uploads\/2026\/09\/1-Doppelspat-Jose-Maria-patoni-durango-mexiko.jpg","type":"image\/jpeg"}],"twitter_card":"summary_large_image","twitter_misc":{"Est. reading time":"2 minutes"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"WebPage","@id":"https:\/\/mineralien-weltweit.com\/en\/product\/optical-calcite-jose-maria-patoni-mexico-cleavage-rhombohedron\/","url":"https:\/\/mineralien-weltweit.com\/en\/product\/optical-calcite-jose-maria-patoni-mexico-cleavage-rhombohedron\/","name":"Optical Calcite from Jos\u00e9 Mar\u00eda Patoni, Mexico | Double Refraction","isPartOf":{"@id":"https:\/\/mineralien-weltweit.com\/en\/#website"},"primaryImageOfPage":{"@id":"https:\/\/mineralien-weltweit.com\/en\/product\/optical-calcite-jose-maria-patoni-mexico-cleavage-rhombohedron\/#primaryimage"},"image":{"@id":"https:\/\/mineralien-weltweit.com\/en\/product\/optical-calcite-jose-maria-patoni-mexico-cleavage-rhombohedron\/#primaryimage"},"thumbnailUrl":"https:\/\/mineralien-weltweit.com\/wp-content\/uploads\/2026\/09\/1-Doppelspat-Jose-Maria-patoni-durango-mexiko.jpg","datePublished":"2026-09-19T07:07:13+00:00","dateModified":"2026-09-19T07:23:22+00:00","description":"Transparent optical Calcite from Jos\u00e9 Mar\u00eda Patoni, Durango, with clearly visible double refraction. Cleavage rhombohedron, 3.1 cm.","breadcrumb":{"@id":"https:\/\/mineralien-weltweit.com\/en\/product\/optical-calcite-jose-maria-patoni-mexico-cleavage-rhombohedron\/#breadcrumb"},"inLanguage":"en-US","potentialAction":[{"@type":"ReadAction","target":["https:\/\/mineralien-weltweit.com\/en\/product\/optical-calcite-jose-maria-patoni-mexico-cleavage-rhombohedron\/"]}]},{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/mineralien-weltweit.com\/en\/product\/optical-calcite-jose-maria-patoni-mexico-cleavage-rhombohedron\/#primaryimage","url":"https:\/\/mineralien-weltweit.com\/wp-content\/uploads\/2026\/09\/1-Doppelspat-Jose-Maria-patoni-durango-mexiko.jpg","contentUrl":"https:\/\/mineralien-weltweit.com\/wp-content\/uploads\/2026\/09\/1-Doppelspat-Jose-Maria-patoni-durango-mexiko.jpg","width":1250,"height":956,"caption":"Transparent optical Calcite as a cleavage rhombohedron"},{"@type":"BreadcrumbList","@id":"https:\/\/mineralien-weltweit.com\/en\/product\/optical-calcite-jose-maria-patoni-mexico-cleavage-rhombohedron\/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Start","item":"https:\/\/mineralien-weltweit.com\/en\/"},{"@type":"ListItem","position":2,"name":"Shop","item":"https:\/\/mineralien-weltweit.com\/en\/shop\/"},{"@type":"ListItem","position":3,"name":"Optical Calcite from Jos\u00e9 Mar\u00eda Patoni, Mexico \u2013 Clear Cleavage Rhombohedron"}]},{"@type":"WebSite","@id":"https:\/\/mineralien-weltweit.com\/en\/#website","url":"https:\/\/mineralien-weltweit.com\/en\/","name":"mineralien-weltweit.com","description":"","potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/mineralien-weltweit.com\/en\/?s={search_term_string}"},"query-input":{"@type":"PropertyValueSpecification","valueRequired":true,"valueName":"search_term_string"}}],"inLanguage":"en-US"}]}},"_links":{"self":[{"href":"https:\/\/mineralien-weltweit.com\/en\/wp-json\/wp\/v2\/product\/3197","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/mineralien-weltweit.com\/en\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/mineralien-weltweit.com\/en\/wp-json\/wp\/v2\/types\/product"}],"replies":[{"embeddable":true,"href":"https:\/\/mineralien-weltweit.com\/en\/wp-json\/wp\/v2\/comments?post=3197"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/mineralien-weltweit.com\/en\/wp-json\/wp\/v2\/media\/3194"}],"wp:attachment":[{"href":"https:\/\/mineralien-weltweit.com\/en\/wp-json\/wp\/v2\/media?parent=3197"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/mineralien-weltweit.com\/en\/wp-json\/wp\/v2\/product_brand?post=3197"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/mineralien-weltweit.com\/en\/wp-json\/wp\/v2\/product_cat?post=3197"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/mineralien-weltweit.com\/en\/wp-json\/wp\/v2\/product_tag?post=3197"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}