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My talk • My contributions • Sandbox • My email • India • My autograph book • India-related topics notice board • Spoken articles • Quiz • Portals • India • UN • Chess • Dogs • Contents • Keyboard shortcuts • MCB • WP:SHORT • My userboxes • CHU • 3O • RfC • FAC • RfA • DYK • RC • New pages (skip) • Help • Village Pump • Welcoming Committee • Recent Changes Patrol • VandalProof • Be bold • Don't bite the newcomers • Five pillars • Beware of the tigers • Amnesia test • Signatures Welcome to Nirajrm's (Niraj) userpage Today is Saturday, November 9, 2024, 02:15 (UTC/GMT). Picture of the day Pyromorphite is a mineral species composed of lead chlorophosphate: Pb5(PO4)3Cl, sometimes occurring in sufficient abundance to be mined as an ore of lead. First distinguished chemically by Martin Heinrich Klaproth in 1784, it was named pyromorphite by Johann Friedrich Ludwig Hausmann in 1813. It is usually green, yellow or brown in color, with a resinous lustre. Crystals are common and have the form of a hexagonal prism terminated by the basal planes, sometimes combined with narrow faces of a hexagonal pyramid. Other forms include crystals with a barrel-like curvature and globular or reniform masses. Pyromorphite is part of the apatite group of minerals and bears a close resemblance physically and chemically with two other minerals, mimetite and vanadinite. This focus-stacked photograph, merged from 26 separate images, shows a sample of pyromorphite extracted from the Resuperferolitica Mine in Santa Eufemia, in the Spanish province of Córdoba. The sample measures 3.5 cm × 3.0 cm × 1.5 cm (1.38 in × 1.18 in × 0.59 in).Photograph credit: David Ifar Tip of the day... "Where do I begin?" Wikipedia is an encyclopedia, that explains millions of things about the world, the people and things on it, and beyond. There are 2 ways to look things up in Wikipedia: by searching or by browsing... If you know the name of the topic you are looking for, simply type it into Wikipedia's search box, press ↵ Enter, or click on the magnifying glass. If you would like to look around Wikipedia to see what is on it, keep in mind that many major subjects have a root article on the Portal:Contents/Overviews page, and an outline listed at Portal:Contents/Outlines. There are some other "Tables of Contents" type pages on Wikipedia. They are: Portal:Contents/Portals – portals provide a digest of excerpts and things to do Portal:Contents/Lists – item lists like List of dog breeds Portal:Contents/Glossaries – alphabetized lists of definitions Wikipedia also has an alphabetical index of all of its articles, and a categorical index of most of them. Prior tip – Tips library – Next tip Read more: Portal:Contents   Become a Wikipedia tipster To add this auto-updating template to your user page, use {{totd}} "The game of chess is not merely an idle amusement; several very valuable qualities of the mind are to be acquired and strengthened by it, so as to become habits ready on all occasions; for life is a kind of chess." — American philosopher, scientist, and author Benjamin Franklin