{"product_id":"calcite-w-marcasite-after-thalassinoides","title":"Calcite w\/ Marcasite after Thalassinoides","description":"\u003cp\u003eLinwood Mine, Buffalo,\u003c\/p\u003e\n\u003cp\u003eScott Co., Iowa\u003c\/p\u003e\n\u003cp\u003eUSA\u003c\/p\u003e\n\u003cp\u003e9x2x4.5cm\u003c\/p\u003eExceptional calcite specimen featuring marcasite pseudomorphs after thalassinoides burrow structures. This rare Iowa piece showcases the interplay between mineral replacement and paleontological form—the marcasite has replaced the original burrow infill, creating striking metallic luster against translucent calcite matrix.\n\nFrom the historic Linwood Mine in Scott County, a locality prized by collectors for its distinctive mineral associations and well-preserved specimens. The specimen measures 9 × 2 × 4.5 cm and displays excellent contrast and definition.\n\nA compelling addition to collections focused on Iowa minerals, pseudomorphs, or paleontological-mineralogical intersections.","brand":"Sterling Mineral Imports","offers":[{"title":"Default Title","offer_id":47969038074077,"sku":"57","price":125.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0548\/9954\/0189\/files\/IMG-4875.heic?v=1779918370","url":"https:\/\/sterlingmineralimports.com\/products\/calcite-w-marcasite-after-thalassinoides","provider":"Sterling Mineral Imports","version":"1.0","type":"link"}