EAPS 11600 Chapter Notes - Chapter 3: Scalea, Gemstone, Specific Gravity
19 May 2019
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Document Summary
Mineral-a homogenous, naturally occurring, solid inorganic substance with a definable chemical composition and an internal structure characterized by an orderly arrangement of atoms, ions, or molecules in a lattice. Crystal lattice-the orderly framework within which the atoms or ions of a mineral are fixed. Glass-a solid in which atoms are not arranged in an orderly pattern. Crystal-a single, continuous piece of a mineral bounded by flat surfaces that formed naturally as the mineral grew. Crystal faces-the flat surfaces of a crystal, formed during the crystal"s growth. Polymorphs-two minerals that have the same chemical composition but a different crystal lattice structure. Color-characteristic of a material due to the spectrum of light emitted or reflected by the material, as perceived by eyes or instruments. Streak-the color of the powder produced by pulverizing a mineral on an unglazed ceramic plate. Hardness-a measure of a relative ability of a mineral to resist scratching.
