{"title":"Marcasite","description":"\u003cp class=\"MsoNormal\"\u003eMarcasite, a polymorph of \u003ca href=\"https:\/\/adamantineminerals.com\/collections\/pyrite\" target=\"_blank\" title=\"Pyrite mineral specimens and crystals for sale.\" rel=\"noopener\"\u003epyrite\u003c\/a\u003e, is an iron sulfide mineral (FeS₂) that crystallizes in the orthorhombic crystal system. This brass-yellow to pale bronze mineral is prized by collectors for its distinctive spear-shaped crystals, radiating clusters, and vibrant iridescent oxidations that develop over time. Marcasite often forms striking associations with calcite and barite, creating aesthetically compelling mineral specimens. Through geologic mineral replacement processes, marcasite can also beautifully preserve fossils, capturing ancient life in metallic detail. To maintain the long-term stability of marcasite specimens, collectors should store them in low-humidity environments with silica gel desiccants to prevent deterioration.\u003c\/p\u003e","products":[{"product_id":"calcite-and-marcasite","title":"Calcite and Marcasite","description":"\u003cp\u003eA truly beautiful piece out of Indiana, a sharp scalenohedral calcite with a dusting of marcasite crystals. The calcite has a nearly glassy luster, which shines through the contrasting metallic marcasite crystals. 15.59 g. \u003c\/p\u003e","brand":"Adamantine Minerals","offers":[{"title":"Default Title","offer_id":51394372141329,"sku":"cal58","price":55.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0900\/2277\/3009\/files\/cal58_5.jpg?v=1743657412"},{"product_id":"min1974barite-marcasite","title":"Barite \u0026 Marcasite","description":"A superb cluster of sharp barite crystals exhibiting crisp, parallel growth and a warm, pale-gold hue. Slender marcasite rods with metallic luster weave through the piece, adding to it's sculptural appeal. Though opaque, the barite blades transmit a soft glow in some areas. Hailing from the historic Linwood Mine, this miniature specimen captures the classic form and finish that make Linwood barites so prized.","brand":"Adamantine Minerals","offers":[{"title":"Default Title","offer_id":51767260774673,"sku":"min1974","price":40.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0900\/2277\/3009\/files\/Barite-Marcasite-linwood-mine-crystals-from-usa-iowa-mineral-specimens.jpg?v=1783501064"},{"product_id":"min1976calcite-marcasite","title":"Calcite \u0026 Marcasite","description":"An appealing miniature specimen featuring translucent, scalenohedral to rhombohedral calcite crystals perched on a matrix of brassy, metallic marcasite from the iconic Linwood Mine in Iowa, USA. The calcite displays sharp terminations, while the marcasite glistens with a brilliant metallic luster. This combination highlights the contrasting habits and lusters that collectors prize in classic Iowa mineralogy. ","brand":"Adamantine Minerals","offers":[{"title":"Default Title","offer_id":51767302717713,"sku":"min1976","price":32.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0900\/2277\/3009\/files\/Calcite-Marcasite-linwood-mine-crystals-from-usa-iowa-mineral-specimens.jpg?v=1783501104"},{"product_id":"min1977calcite-marcasite","title":"Calcite \u0026 Marcasite","description":"A stunning cluster of glassy calcite with glittery marcasite flecks scattered within the crystals. The lustrous faces of the gemmy prisms catch light from all directions, highlighting the crisp form and intricate details of the lustrous faces. This specimen is an excellent representation of why Linwood Mine calcites are held in such high regard by collectors. Its combination of luster, clarity, and sculptural form make it an ideal specimen for collectors with an interest on fine calcites and USA mineral specimens. ","brand":"Adamantine Minerals","offers":[{"title":"Default Title","offer_id":51769099976977,"sku":"min1977","price":60.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0900\/2277\/3009\/files\/Calcite-Marcasite-linwood-mine-crystals-from-usa-iowa-mineral-specimens_715aa804.jpg?v=1783501124"},{"product_id":"min1982calcite-with-marcasite-inclusions","title":"Calcite with Marcasite Inclusions","description":"Lovely cluster of sharp scalenohedral calcites with marcasite inclusions from Linwood Mine in Iowa. Featuring a glassy luster paired with frosty white etchings, which creates a varied look with beautiful contrast. ","brand":"Adamantine Minerals","offers":[{"title":"Default Title","offer_id":51783340884241,"sku":"min1982","price":36.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0900\/2277\/3009\/files\/Calcite-with-Marcasite-Inclusions-linwood-mine-crystals-from-usa-iowa-mineral-specimens.jpg?v=1783501282"},{"product_id":"min2003-calcite-marcasite","title":"Calcite \u0026 Marcasite","description":"A cluster of transparent to translucent calcite crystals with terminations perched on a white matrix, accented by brassy marcasite blades that form intricate metallic clusters. Sourced from the historic Linwood Mine in Iowa, this specimen showcases the striking contrast between the calcite’s bright vitreous luster and the marcasite’s golden sheen and would make an impressive addition to any collection. The matrix on the backside of this specimen does shed a small amount of material, but this does not affect the structure or stability of the specimen. ","brand":"Adamantine Minerals","offers":[{"title":"Default Title","offer_id":51846628147473,"sku":"min2003","price":180.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0900\/2277\/3009\/files\/Calcite-Marcasite-linwood-mine-crystals-from-usa-iowa-mineral-specimens_6f5b9791.jpg?v=1783501578"},{"product_id":"min2016calcite-marcasite","title":"Calcite \u0026 Marcasite","description":"An absolutely stunning specimen of calcite with marcasite. The calcites are gemmy with a scalenohedral crystal form and the marcasite has a brassy red hue, creating lovely contrast in the specimen. Overall, a fantastic specimen with lovely crystal arrangement from a classic American locality; Linwood Mine. This specimen measures 46 mm at its greatest dimension. ","brand":"Adamantine Minerals","offers":[{"title":"Default Title","offer_id":52007180140817,"sku":"min2016","price":62.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0900\/2277\/3009\/files\/Calcite-Marcasite-linwood-mine-crystals-from-usa-iowa-mineral-specimens_bd35ee73.jpg?v=1783501816"},{"product_id":"min2055marcasite","title":"Marcasite","description":"A stunning specimen of marcasite with beautiful brassy-gold \u0026amp; green coloration, arranged in a spikey cluster of platey crystals. Marcasite, a polymorph of pyrite, is orthorhombic rather than isometric. This difference in structure results in marcasite taking on a more disorganized look, due to its less symmetric crystallization. Though the two minerals share the same formula, their different structures result in uniquely different looks. ","brand":"Adamantine Minerals","offers":[{"title":"Default Title","offer_id":52503098392849,"sku":"min2055","price":50.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0900\/2277\/3009\/files\/Marcasite-linwood-mine-crystals-from-usa-iowa-mineral-specimens.jpg?v=1783501929"},{"product_id":"calcite-with-marcasite","title":"Calcite with Marcasite","description":"\u003cp\u003eVitreous calcite crystals with brassy-greenish marcasite. A lovely contrasting piece showcasing beautiful crystal forms and coloration. From the Linwood Mine in Scott County, Iowa. \u003c\/p\u003e","brand":"Adamantine Minerals","offers":[{"title":"Default Title","offer_id":52664771903761,"sku":"min2083","price":25.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0900\/2277\/3009\/files\/Calcite-with-Marcasite-linwood-mine-crystals-from-usa-iowa-mineral-specimens.jpg?v=1783501941"},{"product_id":"min2096calcite-marcasite","title":"Calcite \u0026 Marcasite","description":"A quality association piece featuring calcite and marcasite from the Linwood Mine, Iowa. Gemmy, blocky calcite crystals display excellent vitreous luster and are aesthetically positioned alongside metallic marcasite showing typical iridescent tarnish colors. The specimen effectively demonstrates the distinctive crystal habits of both species from this renowned locality.","brand":"Adamantine Minerals","offers":[{"title":"Default Title","offer_id":52710513836305,"sku":"min2096","price":32.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0900\/2277\/3009\/files\/Calcite-Marcasite-linwood-mine-crystals-from-usa-iowa-mineral-specimens_2032acc8.jpg?v=1783501955"},{"product_id":"min1979calcite-marcasite","title":"Calcite \u0026 Marcasite","description":"A striking twinned calcite specimen from Iowa's Linwood Mine, displaying the characteristic sharp rhombohedral form for which this locality is renowned. These twinned crystals display a frosty surface with a waxy luster and a slight translucence that allows light to pass though the crystal when backlit. Near the marcasite at one end of the piece, there is a patch of glittery casts left behind by other crystals. The surface texture varies in some locations, with it more frosted on some faces than others. A few minor blemishes are present along edges of the crystal. An overall sharp and distinctive crystal with high aesthetic appeal from a classic US locality. ","brand":"Adamantine Minerals","offers":[{"title":"Default Title","offer_id":52857431752977,"sku":"min1979","price":45.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0900\/2277\/3009\/files\/Calcite-Marcasite-linwood-mine-crystals-from-usa-iowa-mineral-specimens_b09d521e.jpg?v=1783502029"},{"product_id":"min3020calcite-marcasite","title":"Calcite \u0026 Marcasite","description":"\u003cp\u003e\u003cspan\u003eBeautiful specimen featuring transparent to translucent gem calcite crystals accented by brassy marcasite blades forming intricate metallic clusters. Sourced from the historic Linwood Mine in Iowa, this specimen showcases the striking contrast between the calcite’s bright vitreous luster and the marcasite’s brassy sheen and would make an excellent addition to any collection. \u003c\/span\u003e\u003c\/p\u003e","brand":"Adamantine Minerals","offers":[{"title":"Default Title","offer_id":52864593101073,"sku":"min3020","price":35.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0900\/2277\/3009\/files\/Calcite-Marcasite-linwood-mine-crystals-from-usa-iowa-mineral-specimens_d8ff680d.jpg?v=1783502102"},{"product_id":"min3021marcasite","title":"Marcasite","description":"\u003cp\u003eGorgeous Linwood Mine specimen with beautiful metallic crystals of marcasite in a array of colors from gold to bronze to blue. Small clear to white calcites are dotted around the specimen. An outstanding piece with glittery crystals and beautiful colors!\u003c\/p\u003e","brand":"Adamantine Minerals","offers":[{"title":"Default Title","offer_id":52864609059089,"sku":"min3021","price":25.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0900\/2277\/3009\/files\/Marcasite-linwood-mine-crystals-from-usa-iowa-mineral-specimens_28cbf1c7.jpg?v=1783502190"},{"product_id":"min3030calcite-marcasite","title":"Calcite \u0026 Marcasite","description":"\u003cp\u003e\u003cspan\u003eAn excellent marcasite \u0026amp; calcite specimen displaying multiple calcite growth phases, complemented by lustrous metallic marcasite. Tiny scalenohedral calcites are present in some areas of the specimen, and are then overgrown by larger prismatic calcite rhombs with phenomenal luster. Between the distinct gem calcite crystals are intricate growths of marcasite. Sourced from the classic Midwest locality: Linwood Mine, Scott County, Iowa. This specimen showcases the striking contrast between the calcite’s bright vitreous luster and the marcasite’s brassy sheen and would make an excellent addition to any collection. \u003c\/span\u003e\u003c\/p\u003e","brand":"Adamantine Minerals","offers":[{"title":"Default Title","offer_id":52864689209617,"sku":"min3030","price":24.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0900\/2277\/3009\/files\/Calcite-Marcasite-linwood-mine-crystals-from-usa-iowa-mineral-specimens_e1e2d324.jpg?v=1783502239"},{"product_id":"min3167calcite-and-marcasite","title":"Calcite and Marcasite","description":"Beautiful calcite crystals with scalenohedral form, marcasite inclusions and excellent luster. Metallic marcasite crystals sit below the calcites, adding excellent color and detail. A lovely pairing from a highly regarded Iowa locality.","brand":"Adamantine Minerals","offers":[{"title":"Default Title","offer_id":53645107003665,"sku":"min3167","price":50.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0900\/2277\/3009\/files\/Calcite-and-Marcasite-linwood-mine-crystals-from-usa-iowa-mineral-specimens.jpg?v=1783502389"}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0900\/2277\/3009\/collections\/min2055_4.jpg?v=1761520580","url":"https:\/\/adamantineminerals.com\/collections\/marcasite.oembed","provider":"Adamantine Minerals","version":"1.0","type":"link"}