Colour in minerals worksheet V2

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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/gem colour 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 Gem Both 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 as charge transfer, produces the color blue . Gem When 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 Gem Emeralds are formed when chromium, 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 Mineral The majority of natural diamonds contain nitrogen 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. Mineral It 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 Azurite is a copper carbonate hydroxide mineral with a chemical composition of Cu 3 (CO 3 ) 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 Gem Orange 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. Fluorite Mineral Colorless, although samples are often deeply colored owing to impurities; Purple, lilac, golden- yellow, green, blue, pink, champagne, brown.
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