{"product_id":"fru-gra-2","title":"Ercall Granophyre (England, UK)","description":"\u003cp\u003e\u003cstrong\u003eErcall Granophyre Specimen \u003c\/strong\u003e- The Ercall \u0026amp; The Wrekin, Wellington, Telford \u0026amp; Wrekin\/Shropshire, England, UK\u003c\/p\u003e\n\u003cp data-path-to-node=\"3\"\u003eThis robust specimen is a spectacular example of \u003cb\u003eGranophyre\u003c\/b\u003e, an \u003cb\u003eintrusive igneous rock\u003c\/b\u003e sourced from the historically and geologically significant \u003cb\u003eErcall\u003c\/b\u003e hill in Telford, England. The Ercall Granophyre forms the basement rock in this area, beneath the famous Ercall Conglomerate, and is a key component of the region's geological history.\u003c\/p\u003e\n\u003cp data-path-to-node=\"5\"\u003eThe rock is dominated by a striking \u003cb\u003ereddish-brown to pink colour\u003c\/b\u003e, which is characteristic of the potassium-rich \u003cb\u003eK-feldspar\u003c\/b\u003e (orthoclase) and quartz that constitute most of the rock's volume. Its texture is the defining feature: it is \u003cb\u003emicro-crystalline\u003c\/b\u003e with a unique \u003cb\u003egranophyric\u003c\/b\u003e texture. This texture is named after the rock and is formed when \u003cb\u003equartz\u003c\/b\u003e and \u003cb\u003efeldspar\u003c\/b\u003e crystals grow simultaneously in a finely intergrown pattern, often resembling graphic writing under magnification. This indicates a rapid but not instantaneous cooling of the magma.\u003c\/p\u003e\n\u003cp data-path-to-node=\"7\"\u003eThe Ercall Granophyre is a notable intrusion, dated to the \u003cb\u003elate Precambrian\u003c\/b\u003e (Neoproterozoic) era, making it one of the oldest rocks in the region. It is the hard, resistant rock that gives the Ercall hill its form and is the source material for many of the clasts found in the overlying Ercall Conglomerate. Its geological setting—part of the \u003cb\u003eWrekin-Lilleshall structure\u003c\/b\u003e and connected to the Uriconian Volcanic Group—makes it invaluable for understanding the ancient magmatic and tectonic history of the UK. This specimen is an excellent display piece for \u003cb\u003ecollectors\u003c\/b\u003e, a superb teaching aid for \u003cb\u003euniversity students\u003c\/b\u003e, and a must-have for anyone interested in \u003cb\u003eUK igneous geology\u003c\/b\u003e.\u003c\/p\u003e\n\u003cp data-path-to-node=\"7\"\u003e\u003cstrong data-start=\"136\" data-end=\"147\"\u003eOrigin:\u003c\/strong\u003e\u003cspan\u003e The Ercall, Wellington, Telford \u0026amp; Wrekin\/Shropshire, England, UK\u003c\/span\u003e\u003cbr data-start=\"196\" data-end=\"199\"\u003e\u003cstrong data-start=\"199\" data-end=\"213\"\u003eRock type:\u003c\/strong\u003e\u003cspan\u003e Granophyre\u003c\/span\u003e\u003cbr data-start=\"236\" data-end=\"239\"\u003e\u003cstrong data-start=\"358\" data-end=\"367\"\u003eSize:\u003c\/strong\u003e\u003cspan\u003e ~6(L) x 5(H) x 4(W) cm (see scale cube), 140 g\u003c\/span\u003e\u003c\/p\u003e","brand":"Frugeo","offers":[{"title":"Default Title","offer_id":52540742893905,"sku":"FRU-GRA-2","price":15.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0885\/9749\/6145\/files\/FRU-GRA-2a.jpg?v=1764881470","url":"https:\/\/frugeo.science\/products\/fru-gra-2","provider":"Frugeo Geology Store","version":"1.0","type":"link"}