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Earth Science Chapter 5
Vocabulary for Chapter 5
23
Science
9th Grade
11/10/2009

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Term
Atomic Number
Definition
the number of protons in the nucleus of an atom
Term
Carbonate
Definition
a nonsilicate mineral that has as its major building block one carbon atom covalently bonded to 3 oxygen atoms
Term
Cleavage
Definition
tendancy for a mineral to split along planes of its crystalline structure where bonds are weakest
Term
Compound
Definition
substance that contains atoms of 2 or more elements that are chemically combined
Term
Crystal
Definition
solid substance in which the atoms or ions are arranged in an orderly pattern that is repeated over and over again
Term
Element
Definition
composed of atoms that are chemically alike and can't be broken
Term
Fracture
Definition
irregular pattern of breakage in a direction other than along the cleavage planes
Term
Ion
Definition
electronically charged atom or group of atoms
Term
Isotope
Definition
Any of two or more forms of the same chemical element that differ in atomic mass
Term
Luster
Definition
quality of appearance of light reflected from its surface
Term
Mass number
Definition
sum of the numbers of protons and neutrons in an atom
Term
Metal
Definition
element that loses electrons easily to form positive ions
Term
Mineral
Definition
naturally occuring inorganic solid with a distinct chemical composition and crystalline structure
Term
Minerology
Definition
the study of minerals and their properties
Term
Molecule
Definition
a group of atoms linked together by chemical bonds
Term
Nonmetal
Definition
an element that gains electrons easily to form negative ions
Term
Oxide
Definition
mineral consisting of a metal element combined with oxygen
Term
Rock-forming Mineral
Definition
specific group of minerals known to form rocks
Term
Silica Tetrahedron
Definition
1 silicon ion and 4 oxygen ions that form the basic building blocks of silicate
Term
Silicate
Definition
any mineral that has as its building block a tetrahedron of silicon and oxygen
Term
Specific Gravity
Definition
ratio of the weight of a substance to the weight of an equal volume of water; property used to identify minerals
Term
Streak
Definition
property of a mineral that describes its color in powdered form
Term
Sulfide
Definition
mineral consisting of a metal element combined with sulfur
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