Colour in minerals & gemstones worksheet Label each of the following minerals/ gemstones, and describe the way colour is produced in each. Possibilities: ruby, diamond, azurite, yellow diamond, emerald, cinnabar, fluorite, sapphire, malachite, Hope diamond mineral/gemcolour producing mechanism Malachite Mineral Hemoglobin catalyzes the reaction between LMG and hydrogen peroxide, converting the colorless LMG into malachite green. Therefore, the appearance of a green color indicates the presence of blood Sapphire GemBoth rubies and sapphires owe their intense colors to impurities, ruby to the presence of chromium, and blue sapphire to both titanium and iron. In rubies, the color can be explained by crystal field theory, but in sapphire, a slightly different process, known ascharge transfer, produces the color blue . GemWhen impurities are added to colorless gemstones, brilliant colors are frequently produced. When chromium is added to colorless corundum, a red ruby is born, and a green emerald emerges when chromium is added to colorless beryl. Ruby
Emerald GemEmeralds are formed whenchromium, vanadium, and iron are present in the mineral beryl. The varying presence of these three elements gives emerald its range of color. Chromium and vanadium make an intense green color. Iron gives the stone a bluish tint. Diamond MineralThe majority of natural diamonds containnitrogen atoms as impurities in their internal structure. These impurities produce a yellow or brown colour. Mike says, 'Because nitrogen is so widespread, it is no surprise that pale tints of yellow and brown are the most common coloured diamond. MineralIt has a bright red color that has caused people to use it as a pigment, and carve it into jewelry and ornaments for thousands of years in many parts of the world. Because it is toxic, its pigment and jewelry uses have almost been discontinued Cinnabar
Azurite Mineral Azuriteis a copper carbonate hydroxide mineral with a chemical composition of Cu3(CO3)2(OH)2 . It is best known for its characteristic deep blue to violet-blue color. The blue color, known as "azure," is like the deep blue evening skies often seen above deserts and winter landscapes. Yellow diamond GemOrange and Yellow Diamonds The remarkable hue of yellow and orange diamonds can be attributed to one element: nitrogen. While a diamond is forming,nitrogen atoms will arrange in such a way that that blue light is absorbed, thus producing a yellow color. FluoriteMineralColorless, although samples are often deeply colored owing to impurities; Purple, lilac, golden- yellow, green, blue, pink, champagne, brown.