WebCordierite with sector-twinning, commercially referred to as ‘cherry blossom stone’, in a hornfels. Cordierite was altered to fine-grained sericite (pinite) and now appears of dull white/grey color. Mikata, Honshu, Japan. ... Spotted schists are common metamorphic rocks in contact aureoles. The ‘spots’ are former cordierite crystals ... WebAndalusite-cordierite hornfels This sample of andalusite-cordierite hornfels comes from the aureole of the Skiddaw granite in Cumbria, and is part of the Skiddaw Group, a … < Return to specimen ...

Minerals and Rocks: METAMORPHIC ROCKS: Origin of …

WebSpotted Slate (outer spotted slate zone) This rock is a fine-grained, poorly foliated, porphyroblastic metamorphic rock, dominated by poikiloblasts of cordierite and biotite, in a matrix of biotite, muscovite, quartz and … WebCordierite-spotted hornfels commonly is present at the innermost part of the aureole, with epidote and chlorite-rich hornfels, metagraywacke, quartzite, and metaconglomerate characteristic of the remainder of the contact zone. The thermal aureole above and beneath the thick HTQ sheets is about 120m (400ft) thick, but about 60m (200ft) thick ... taglight.com

14 Metamorphism of Pelitic Rocks – Open Petrology - OpenGeology

WebHornfels are dense, compact, fine-grained, contact metamorphic rocks. They typically form as the result of contact metamorphism of shales or basalts. Some hornfels have distinctive rounded patches of more coarsely-crystalline material (see dark greenish spheroidal patches in the sample shown below) - such rocks are called spotted hornfels . WebCordierites is a genus of fungi in the family Cordieritidaceae.. The genus name of Cordierites is in honour of François Simon Cordier (1797-1874), a French Military doctor and … taglie the north face