Why do I suddenly smell something burning? Brief episodes of phantom smells or phantosmia — smelling something that's not there — can be triggered by temporal lobe seizures, epilepsy, or head trauma. Phantosmia is also associated with Alzheimer's and occasionally with the onset of a migraine. What does it mean when you smell burning sulfur? Natural gas and propane are odorless, but gas companies inject them with a chemical called mercaptan that gives them a sulfur smell—like rotten eggs—to alert residents to a gas leak. A small gas leak could be creating the occasional foul odor you're noticing, so don't...

Where is siderite most commonly found? hydrothermal veins Siderite is commonly found in hydrothermal veins, and is associated with barite, fluorite, galena, and others. It is also a common diagenetic mineral in shales and sandstones, where it sometimes forms concretions, which can encase three-dimensionally preserved fossils. Who discovered siderite? Named in 1845 by Wilhelm Karl von Haidinger from the Greek "σίδηρος" (sideros), "iron", in allusion to its composition. Calcite Group. Magnesite-Siderite Series, Rhodochrosite-Siderite Series, Siderite-Smithsonite Series. How is siderite formed? Description: Siderite forms as a sedimentary precipitate, in hydrothermal veins, in metamorphic rocks formed from such protoliths, and, rarely, in...