Ferrous Sulfate Heptahydrate copperas. Green vitriol is a chemical, ferrous sulfate crystals, English name is: ferrous sulfate, for columnar or granular aggregate, irregular block. Green, green with white streaks. The molecular weight of 278.05, pH value of 3, melting point of 64 degrees Celsius, strong thermal decomposition of soluble in water, glycerin, insoluble in ethanol.
Appearance characteristics: crystal structure belongs to monoclinic system. Short columnar crystal, thick plate, fine granular or fibrous, collection show bead block, fiber radial block or leather case, capsule. In all sorts of color of green; When copper is light green blue copperas (copper), water loss, hydroxylation, or oxidation for yellow green, green, yellow to canary yellow, brown spots, red, brown, brown wait for color, transition to a fine iron vitriol melanterite yellow alum or local collection containing limonite); Totally dehydrated pure green vitriol is white. Striation light in color. Fresh crystal transparent, rare; Usually translucent, weathering surface is opaque. Glass, silk luster or earthy luster. Crystal cleavage, fully conchoidal fracture, Weathering is clear see cleavage.
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