Siderite takes its name from the Greek word sideros which means ‘iron’. Another name of the mineral is iron spar. Siderite can be colored in yellow, yellowish-gray, brownish-gray, brownish-yellow, or black. The crystals are opaque and occasionally translucent. The mineral has vitreous or pearly luster. Its hardness is 4.0-4.5, while the density is 3.7-3.9 g/cm3. […]
