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Showing results for tags 'cornwall'.
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From the album: Coastline of the Crackingon Formation.
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From the album: Coastline of the Crackingon Formation.
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From the album: Coastline of the Crackingon Formation.
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From the album: Coastline of the Crackingon Formation.
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New mineral found in rock mined from Wheal Gorland mine, Cornwall, UK
Oxytropidoceras posted a topic in Rocks & Minerals
A new mineral has been discovered by scientists analysing a rock mined in Cornwall from Wheal Gorland mine in St Day about 220 years ago Kernowite: New mineral found on rock mined in Cornwall Miyawaki, R., Hatert, F., Pasero, M. and Mills, S.J., 2020. IMA Commission on New Minerals, Nomenclature and Classification (CNMNC)–Newsletter 58. European Journal of Mineralogy, 32(6), pp.645-651. Kernowite - Cu2Fe3+(AsO4)(OH)4•4H2O Yours, Paul H. -
Childhood specimen identified! - attractive spotted hornfels, Cornwall, UK.
TqB posted a topic in Rocks & Minerals
This is a special rock to me. I've had it since the age of nine and I collected it at Sennen Cove, next to Land's End in Cornwall, when we lived nearby. There were boulders of it amongst the familiar granite. Strangely, I've never worked out before what it is (I'm fairly rubbish at rocks!). At the time, I assumed it was some sort of serpentine but you only get that miles away, on the Lizard. Anyway, some intensive internet searching has revealed its identity. This paper: Shallow laccolithic emplacement of the Land’s End and Tregonning granites It's spotted hornfels - which is metamorphosed shale/slate, cooked by the adjacent granite intrusion. Actually a relatively rare rock. The green/grey mineral is cordierite, present as quite nice pseudo-hexagons. It shows altered rims (pinitisation) which have weathered to give the red on the surface (I think). Cordierite is the mineral that Vikings used for navigation, to spot where the sun was in a cloudy sky. It's intensely dichroic - showing two colours according to orientation in polarised light. This has led to much more learning but I'll leave it there - this chunk of rock has taught me a lot! Submerged in water for colour contrast - about 9cm across Dry Closeup Polished section, submerged (scale 1cm) Pseudo-hexagon in centre (cordierite is orthorhombic), altered rim. Photographed submerged. From the linked paper that led to me identifying it (plate 8) - this is from the coast at St. Just, very near Sennen.- 5 replies
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I've always wanted one of these and it's just arrived! I spotted it on the usual auction site where it was being sold by an antique seller as a possible fish in slate . It is true slate but is a legendary Delabole Butterfly, a metamorphosed Cyrtospirifer extensus, almost certainly from the Delabole slate quarry in Cornwall, UK. Although quite famous and widely referred to, there's not that much solid information. They appear to have been sold to tourists, largely in the 19th century and this split specimen seems typical. I think they're quite rare though - most photographed specimens seem to be in museums. Many years ago, I wandered around the edge of the quarry and managed to find one small fragment in the waste. Devonian, Frasnian, about 4" across. ,
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Cornwall and south Devon 'originally part of mainland Europe'
Oxytropidoceras posted a topic in Fossil News
Cornwall and south Devon 'originally part of mainland Europe' Study reveals Britain acquired regions when struck by land bearing what is now France, Ima Sample, The Guardian https://www.theguardian.com/science/2018/sep/14/cornwall-and-south-devon-originally-belonged-to-europe The open access paper is: Arjan H. Dijkstra, and Callum Hatch, 2018, Mapping a hidden terrane boundary in the mantle lithosphere with lamprophyres Nature Communications. 9, Article number: 3770 https://www.nature.com/articles/s41467-018-06253-7 Yours, Paul H. -
I'm new to fossils(apart from basic school stuff). Saw this on a walk on the coastal path in polzeath, Cornwall- is it a fossil (hopefully) or just a bit of metal!
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I found this "tooth" on the beach in Cornwall a few summers back and I'm curious on what it actually is. If it is a tooth...from what animal? It's about 1.1 inches in length.