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GIA Colored Stone Final Exam Questions And Answers
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GIA Colored Stone Final Exam Questions And Answers...
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GIA Co lored Stone Final E xam Que stions And An swers By what date had Kokichi Mikimoto begun culturing whole pearls - Answer 1 908 Synthetic gem materials - Answer Are not minerals which of the following is an organic gem - Answer amber which of the following is amorphous - Answer amber a natural material that's made up of a mass of one or more kinds of mineral crystals is - Answer rock what group does alamandine belong to - Answer garnet A gem produced by, or derived from, a living organism is - Answer organic which of the following is a gem variety - Answer demantoid the world's largest gem-consuming market is - Answer the US a substance that consists of atoms of only one kind is a - Answer chemical element Media attention in the 1990s regarding its treatment reduced consumer confidence in - Answer emerald a natural, inorganic substance with a characteristic chemical composition and usual crystal structure is a - Answer mineral most gems are - Answer minerals To be a gem, a mineral must be beautiful, durable, and - Answer rare a broad gem category based on chemical composition and crystal structure is called a - Answer gem species Many colored stones are mined by - Answer independent miners using small-scale mining methods. Rocks altered by heat and pressure beneath Earth's surface are - Answer metamorphic Which type of deposit is usually the most profitable for colored stone mining? - Answer secondary Which gem can crystallize in volcanic rock from gasses released by magma? - Answer red beryl Emeralds are rarely found in placer deposits because they're - Answer unable to withstand much abrasion Which is a workable alluvial deposit of gem minerals with economic potential? - Answer placers Which is a deposit where gems eroded from the source rock and remained in place nearby? - Answer eluvial from granite, pegmatite gems get exotic elements like - Answer beryllium, boron, a nd lithium Myanmar's famous Mogok ruby deposits were formed by - Answer metamorphic process most of the gems in tanzania's umba river valley are formed in - Answer placer depo sits A deposit where gems are found in the rock that where they formed is called - An swer primary deposit Which is a key locality for hydrothermal gems? - Answer Ouro Preto, Brazil Heat and pressure transform limestone into - Answer marble which gem form by metamophosis - Answer tanzanite Most gemstones form in the - Answer continental crust kunzite is most often associated with - Answer tourmaline and beryl in pegmatites how heavy an object is in relation to its size - Answer density A two-phase inclusion is a cavity in a gem that's typically filled with a - Answer liquid an d a gas which type of twinning is caused by environmental change after a gem forms - Answ er polysynthetic which element caused red in ruby and green in emerald - Answer chromium A unit cell defines a mineral's - Answer basic identity which type of twinning looks as if two crystal halves are mirror images - Answer contact twinning crystals that grow in a flux that is highly saturated with the necessary elements tend to be - - Answer small which is classified in the orthorhombic crystal system - Answer topaz Which gems are cryptocrystalline aggregates? - Answer Chalcedony and turquoise Atoms in a gem that aren't part of its essential chemical composition are called - Answer trace elements Many fashioned rubies have shallow proportions because they're cut from - An swer flattened crystals Rough spinel often occurs as - Answer twinned crystals Needles of actinolite found in emerald are classified as - Answer inclusions which aggregates crystals are visible only under very high magnification - Answer cryptocrystalline the trace elements that cause corundum's blue are - Answer iron and titanium what element does chromium substitute for to cause ruby's red - Answer aluminium In many blue sapphires, the intervalence charge transfer that causes the color is between - Answer iron and titanium The pattern of dark vertical lines or bands shown by certain gems when viewed through a spectroscope is called - Answer absorption spectrum the process where electrons that selectively absorb light are passed back and forth between neighboring impurity ions is known as - Answer charge transfer what element causes the color of both alamandine and peridot - Answer iron the best known and most valuable chatoyant gems is a cat's eye - Answer chry soberyl which components of a transition element's atom can produce color in gems - Answe r electronsThe benefits of buying summaries with Stuvia:
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