Diamonds Flashcard

Question Answer
Squares or rectangles, trigons, and parallel grooves are types of A. macles. B. graining. C. twin crystals. D. growth marks. D. growth marks.
The crystal planes most suitable for cleaving a diamond are the A. cubic planes. B. octahedral planes. C. dodecahedral planes. D. trisoctahedral planes. B. octahedral planes.
Which is the softest crystal direction in diamond? A. Cubic B. Octahedral C. Hexahedral D. Dodecahedral D. Dodecahedral
Crystal shape is an important factor in evaluating rough because A. it influences the clarity grade. B. it often affects color and clarity. C. some crystal shapes are much softer than others. D. it affects the amount of weight retained after cutting. D. it affects the amount of weight retained after cutting.
The diamond term glassie refers to A. an aggregate mass. B. a well-formed octahedral crystal. C. a noticeably rounded hexoctahedron. D. a macle with an abundance of trigons. B. a well-formed octahedral crystal.
A naturally occurring, inorganic substance with a characteristic chemical composition and usually a characteristic crystal structure is known as a A. rock. B. crystal. C. variety. D. mineral. D. mineral.
The habit of gem-quality diamond is the A. cube. B. octahedron. C. dodecahedron. D. hexoctahedron. B. octahedron.
Another name for the cubic crystal system is A. isotropic. B. isometric. C. anisotropic. D. isomorphous. B. isometric.
In diamonds, cleavage is caused by A. variations in density. B. irregular atomic structure. C. octahedrons with points that are easily broken. D. relatively wide spaces between some atomic planes. D. relatively wide spaces between some atomic planes.
A flat, triangular twinned diamond crystal is called a A. macle. B. cleavage. C. splittable. D. tetrahedron. A. macle.
The strongest of all atomic bonds are called A. shells. B. covalent. C. magnetic. D. electrons. B. covalent.
Solid matter with atoms arranged in a regular, repeating pattern is called a(n) A. rock. B. crystal. C. variety. D. element. B. crystal.
The smallest group of atoms with a characteristic chemical composition and the basic crystal structure of a mineral is called a(n) A. atom. B. unit cell. C. tetrahedron. D. building block. B. unit cell.
What is the specific gravity of gem-quality diamond? A. 1.00 B. 2.17 C. 3.52 D. 4.01 C. 3.52
Atoms in a gem that aren’t part of its essential chemical composition are called A. trace elements. B. foreign elements. C. distortion impurities. D. irregularity elements. A. trace elements.
The relative size, arrangement, and contrast of bright and dark areas that result from a diamond’s internal and external reflections is called A. pattern. B. sparkle. C. refraction. D. transmission. A. pattern.
Variations in lighting and surroundings can affect a diamond’s A. RI. B. SG. C. luster. D. appearance. D. appearance.
Visible light is A. also called brilliance. B. the result of dispersion. C. a form of radiant energy. D. a type of ultraviolet radiation. C. a form of radiant energy.
White light is actually A. shortwave radiation. B. the result of dispersion. C. the result of transmission. D. a combination of all the spectral colors. D. a combination of all the spectral colors.

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