Gemology Exam Questions with 100% Correct Answers

Mineral Correct Answer a naturally occuring inorganic substance with a characteristic composition and a definite crystal structure Rock Correct Answer an aggregate of 2 or more minerals exhibiting no definite crystal structure Factors of a gem (name three) Correct Answer beauty, rarity, durability, demand, tradition, portability Three factors of durability Correct Answer toughness, stability, hardness Two most abundant elements in Earth's crust Correct Answer oxygen and silicon A gemstone's resistance to breaking and chipping is known as it's Correct Answer toughness Most often transition element to color gems Correct Answer chromium Common break for transparent gems Correct Answer conchoida Three types of rocks in earth's crust Correct Answer igneous, sedimentary, metamorphic Three gems in cubic crystal system Correct Answer diamond, spinel, garnet Two gems that form in the mantle Correct Answer diamond and peridot Geology is Correct Answer science of the earth 80% of earth's volume is the Correct Answer mantle Isotropic Correct Answer singly refractive Gem normally crystallizes Correct Answer crystal habit