System:TrigonalColour:Yellow - Orange  Lustre:Vitreous Hardness:7  Name:From citrina (color as yellow as citron).  A yellow-orange variety of Quartz. Physical Properties of Citrine Lustre:Vitreous Colour:Yellow - Orange Hardness (Mohs):7 Crystallography of Citrine Crystal System:Trigonal   Information Health Warning:Citrine is a variety of quartz which is usually quite harmless unless broken or powdered. Broken crystals and masses may have razor-sharp edges that can easily cut skin and flesh. Handle with care. Do not grind dry since long-term exposure to finely ground powder may lead to silicosis.