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Diamond delivers long-sought mineral from the deep Earth Davemaoite is a vehicle for radioactive isotopes that help to heat the planet’s mantle. Alexandra Witze, Nature News Diamond from Lower Mantle Found with a New Type of Mineral; High-Pressure Silicate Material Davemaoite Discovered Second to Bridgmanite Ron Jefferson, Science Times, Nov 12, 2021 Diamond hauled from deep inside Earth holds never-before-seen mineral Researchers thought the mineral was impossible to find on Earth's surface By Harry Baker, Live Science, November 11, 2021 The paper is: Tschauner O, Huang S, Yang S, Humayun M, Liu W, Gilbert Corder SN, Bechtel HA, Tischler J, Rossman GR. Discovery of davemaoite, CaSiO3- perovskite, as a mineral from the lower mantle. Science. 2021 Nov 12 374(6569):891-894. doi: 10.1126/science.abl8568. Epub 2021 Nov 11. Yours, Paul H.

Remains of impact that created the Moon may lie deep within Earth, Science, Paul Voosen, March 23, 2021 https://www.sciencemag.org/news/2021/03/remains-impact-created-moon-may-lie-deep-within-earth Publications are: Yuan, Q., Li, M.M., Desch, S.J. and Ko, B., 2021, Giant Impact Origin for the Large Low Shear Velocity Provinces 52nd Lunar and Planetary Science Conference 2021 (LPI Contrib. No. 2548) (open access) https://www.hou.usra.edu/meetings/lpsc2021/pdf/1980.pdf Desch, S.J. and Robinson, K.L., 2019. A unified model for hydrogen in the Earth and Moon: No one expects the Theia contribution. Geochemistry, 79(4), p.125546. (open access) https://www.sciencedirect.com/science/article/pii/S0009281919300509 Yours, Paul H.

Origin of British Crown Jewels’ diamond revealed Valentina Ruiz Leotaud, MiningCom, June 28, 2020 https://www.mining.com/origin-of-british-crown-jewels-diamond-revealed/ CLIPPIR diamonds = Cullinan–like, large, inclusion–poor, pure, irregular, and resorbed diamonds Smith, E.M., Shirey, S.B., Nestola, F., Bullock, E.S., Wang, J., Richardson, S.H. and Wang, W., 2016. Large gem diamonds from metallic liquid in Earth’s deep mantle. Science, 354(6318), pp.1403-1405. https://www.researchgate.net/publication/311666698_Large_gem_diamonds_from_metallic_liquid_in_Earth's_deep_mantle https://www.researchgate.net/figure/Examples-of-rough-CLIPPIR-diamonds-from-the-Letseng-mine-Lesotho-GIA-copyright-credit_fig2_311666698 Yours, Paul H.

I've been looking at my specimens of Acrocoelites trisulculosus from the Toarcian Jet Rock (Mulgrave Shale Member = Falciferum Zone) of the north Yorkshire coast. This is an anoxic mudstone deposited during a prominent worldwide Ocean Anoxic Event (OAE) and, as might be expected, the preservation is very good. A number of them (7 so far) have a thin pyrite layer around the apex. This shows obvious lineation in all of them, mostly oblique to the axis of the rostrum. As pyrite is often associated with soft tissue decay, I strongly suspect that this is preserving muscle texture. The texture is similar to that preserved in some other coleoids (e.g. from Solnhofen). Has anyone else seen this? Comments welcome! EDIT: I may be wrong about the soft preservation - a few well preserved specimens from other localities (though not from here) show similar texture on the calcite. Most belemnites look smooth though. (Comments and photos further down this thread) Just two of the specimens here: No. 1: No. 2: left lateral (with divided dorso-lateral furrow - a little unusual) right lateral

Mysterious Mineral from Earth's Mantle Discovered in South African Diamond By Nicoletta Lanese, Live Science, Planet Earth https://www.livescience.com/new-mineral-discovered-in-diamond.html https://www.sciencealert.com/single-grain-of-african-diamond-found-to-be-unlike-anything-the-world-has-ever-seen https://www.mirror.co.uk/science/mysterious-new-mineral-earths-mantle-20166701 The paper is: Meyer, N.A., Wenz, M.D., Walsh, J.P., Jacobsen, S.D., Locock, A.J. and Harris, J.W., 2019. Goldschmidtite,(K, REE, Sr)(Nb, Cr) O3: A new perovskite supergroup mineral found in diamond from Koffiefontein, South Africa. American Mineralogist, 104(9), pp.1345-1350. https://www.degruyter.com/view/j/ammin.2019.104.issue-9/am-2019-6937/am-2019-6937.xml https://pubs.geoscienceworld.org/msa/ammin/article/104/9/1345/573334/Goldschmidtite-KREESrNbCrO3-A-new-perovskite Yours, Paul H.

Big Diamonds Bring Scientists A Message From Superdeep Earth NPR, http://www.npr.org/sections/thetwo-way/2016/12/15/505386423/big-diamonds-bring-scientists-a-message-from-superdeep-earth Large, rare diamonds offer window into inner workings of Earth's mantle https://carnegiescience.edu/news/biggest-and-best-diamonds-formed-deep-mantle-metallic-liquid https://www.eurekalert.org/pub_releases/2016-12/gioa-lrd120716.php http://phys.org/news/2016-12-biggest-diamonds-deep-mantle-metallic.html http://www.livescience.com/57222-biggest-diamonds-form-in-liquid-metal-pools.html Diamonds: Huge, rare precious stones form 750km underground in Earth's mantle, International Business Times UK http://www.ibtimes.co.uk/huge-rare-diamonds-are-born-pools-liquid-metal-deep-below-earths-surface-1596725 the paper is: Smith, E. M., S. B. Shirey, F. Nestola, and others, 2016, Large gem diamonds from metallic liquid in Earth’s deep mantle. Science. Vol. 354, Issue 6318, pp. 1403-1405. DOI: 10.1126/science.aal1303 http://science.sciencemag.org/content/354/6318/1403 Yours, Paul H.