Les 10 concurrents ccgm.org les plus visités

annalsofgeophysics.eu

annals of geophysics is an international, peer-reviewed, diamond open-access, online journal. annals of geophysics welcomes contributions on primary research on geophysics, seismology, volcanolgy physics and chemistry of the earth, physics of the high atmosphere.

earth-pages.co.uk

research news from the earth sciences

ukge.com

You are purchasing a carefully selected Hematite Kidney Ore Crystal, a striking metallic mineral specimen from the USA. This listing features a 100% genuine Hematite specimen with a distinctive kidney-shaped botryoidal structure. Each piece measures approximately 40–60mm and is individually chosen for quality and uniqueness. The photo shows a representative example; the actual specimen you receive will be similar in shape, size, and quality. Key Features: Authentic Hematite Kidney Ore from the USA Size Range: 40–60mm (see photo with 1cm scale cube) Comes with a Certificate of Authenticity Ideal for collectors, crystal healers, educational display, or gifting Photo shows a representative example – you will receive a piece of similar quality Mineral Information: Species: Hematite (Kidney Ore variety) Chemical Formula: Fe2O3 (Iron Oxide) Hardness: ~5.5-6.5 on the Mohs Scale Colour: Metallic silver to steel-grey Lustre: Metallic Streak: Red to reddish-brown Crystal System: Trigonal Habit: Botryoidal (kidney ore), massive Magnetism: Generally weak or non-magnetic (unlike Magnetite) Geological Notes: Hematite kidney ore forms through precipitation from iron-rich hydrothermal fluids, often in oxidized zones of ore deposits. Found commonly in sedimentary and hydrothermal environments. No specific Zone, Biozone, or formal classifier is associated with this mineral type for this context. This is an excellent addition to any mineral collection or for those interested in the grounding and protective energies associated with Hematite in metaphysical practices.   Disclaimer: All of our crystals are 100% genuine specimens and come with a Certificate of Authenticity. The item you receive will be of similar quality to the one shown in the photos.

pubs.usgs.gov

the publications warehouse contains over 170,000 publications that cover the 150 year history of the usgs

diploweb.com

diploweb.com, la revue géopolitique on line, des experts vous proposent articles, cartes, vidéos sur la stratégie et les relations internationales

data.fao.org

fao portal

populationdata.net

informations, cartes et statistiques sur les populations et pays du monde