it is suitable for sportsmen, extreme sports lovers and travelers

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. […]

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