{"product_id":"fru-gsc-3","title":"Felsocsatar Greenschist (Hungary)","description":"\u003cp data-start=\"216\" data-end=\"683\"\u003e\u003cstrong\u003eFelsőcsatár Greenschist Specimen\u003c\/strong\u003e – Felsőcsatár, Vas County, Hungary\u003c\/p\u003e\n\u003cp data-end=\"442\" data-start=\"226\"\u003eThis striking greenschist specimen comes from the classic \u003cstrong data-end=\"302\" data-start=\"284\"\u003eZöldpala-bánya\u003c\/strong\u003e (“Greenschist Mine”) near \u003cstrong data-end=\"361\" data-start=\"329\"\u003eFelsőcsatár, Western Hungary\u003c\/strong\u003e—one of Central Europe’s best-known localities for low-grade metamorphic rocks.\u003c\/p\u003e\n\u003cp data-path-to-node=\"3\"\u003eThis substantial specimen is an excellent example of \u003cb\u003eGreenschist\u003c\/b\u003e, a low-grade \u003cb\u003emetamorphic rock\u003c\/b\u003e collected by Frugeo from the geologically significant region of \u003cb\u003eFelsőcsatár, Hungary\u003c\/b\u003e. It is characterised by a dark, mottled grey to black matrix, displaying the typical \u003cb\u003efoliated\u003c\/b\u003e or \u003cb\u003eschistose\u003c\/b\u003e texture resulting from directed pressure during its formation. The rock's original composition was likely basaltic or gabbroic, and its current mineralogy, common to the greenschist facies, includes minerals like \u003cb\u003echlorite\u003c\/b\u003e, \u003cb\u003eactinolite\u003c\/b\u003e, and \u003cb\u003eepidote\u003c\/b\u003e. While the green chlorite hue is less prominent on the weathered surface, the presence of iron-bearing minerals is highlighted by striking patches of \u003cb\u003ereddish-brown oxidation\u003c\/b\u003e scattered across the specimen, offering a beautiful colour contrast and demonstrating the rock's chemical history.\u003c\/p\u003e\n\u003cp data-path-to-node=\"4\"\u003eGreenschist forms under relatively low metamorphic temperatures (\u003cspan data-math=\"300^\\circ\\text{C}\" class=\"math-inline\"\u003e\u003cspan class=\"katex\"\u003e\u003cspan aria-hidden=\"true\" class=\"katex-html\"\u003e\u003cspan class=\"base\"\u003e\u003cspan class=\"strut\"\u003e\u003c\/span\u003e\u003cspan class=\"mord\"\u003e30\u003c\/span\u003e\u003cspan class=\"mord\"\u003e0°\u003c\/span\u003e\u003cspan class=\"mord text\"\u003e\u003cspan class=\"mord\"\u003eC\u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e to \u003cspan data-math=\"500^\\circ\\text{C}\" class=\"math-inline\"\u003e\u003cspan class=\"katex\"\u003e\u003cspan aria-hidden=\"true\" class=\"katex-html\"\u003e\u003cspan class=\"base\"\u003e\u003cspan class=\"strut\"\u003e\u003c\/span\u003e\u003cspan class=\"mord\"\u003e50\u003c\/span\u003e\u003cspan class=\"mord\"\u003e0°\u003c\/span\u003e\u003cspan class=\"mord text\"\u003e\u003cspan class=\"mord\"\u003eC\u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e), representing a key stage in the transformation of mafic igneous rocks. This specific piece, sourced from the complex geology of the \u003cb\u003ePannonian Basin\u003c\/b\u003e, holds significant educational and collector value, as it provides a tangible link to the regional tectonic and metamorphic history. It is an ideal, robust piece for \u003cb\u003egeological collections\u003c\/b\u003e, \u003cb\u003eeducational displays\u003c\/b\u003e, or for anyone interested in understanding the metamorphic cycle.\u003c\/p\u003e\n\u003cp data-start=\"992\" data-end=\"1213\"\u003e\u003cstrong data-end=\"147\" data-start=\"136\"\u003eOrigin:\u003c\/strong\u003e Felsőcsatár (Zöldpala Mine), Vas County, Hungary\u003cbr data-end=\"199\" data-start=\"196\"\u003e\u003cstrong data-end=\"213\" data-start=\"199\"\u003eRock type:\u003c\/strong\u003e Greenschist (Zöldpala)\u003cbr data-end=\"239\" data-start=\"236\"\u003e\u003cstrong data-end=\"367\" data-start=\"358\"\u003eSize:\u003c\/strong\u003e ~12(L) x 8(H) x 2(W) cm (see scale cube), 263 g\u003c\/p\u003e","brand":"Frugeo","offers":[{"title":"Default Title","offer_id":52531576537425,"sku":"FRU-GSC-3","price":17.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0885\/9749\/6145\/files\/FRU-GSC-3a.jpg?v=1764791625","url":"https:\/\/frugeo.science\/products\/fru-gsc-3","provider":"Frugeo Geology Store","version":"1.0","type":"link"}