| A | B |
|---|
| Micas | Group of silicate minerals characterized by perfect sheet or scale cleavage resulting from atomic pattern, in which silicon-oxygen tetrahedra linked in sheets. Biotite is ferromagnesian. Muscovite is potassic. |
| Elements | Unique combinations of protons, neutrons, and electrons that cannot be broken down by ordinary chemical methods. |
| Minerals | Naturally occurring solid element or compound, exclusive of biologically formed carbon components. Has definite composition or range of composition and orderly internal atomic arrangement (crystalline structure), which gives unique physical and chemical properties, including tendency to assume certain geometrical forms known as crystals. |
| Magma | Naturally occurring silicate melt, which may contain suspended silicate crystals, dissolved gases, or both. These conditions may be met in general by a mixture containing as much as 65 percent crystals but no more than 11 percent dissolved gases. |
| Compound | An electrically neutral substance that consists of two or more elements combined in specific, constant proportions. Typically has physical characteristics different from those of its constituent elements. |
| Igneous Rocks | Aggregate of interlocking silicate minerals formed by cooling and solidification of magma. |
| Extrusive igneous ocks | Rock solidified from mass of magma poured or blown out upon earth's surface. |
| Crystals | Solid with orderly atomic arrangement, which may or may not develop external faces that give it form. |
Obsidian,  | Glassy equivalent of granite. Black glass. |
| Intrusive igneous rock | Plutonic rocks. Rock solidified from mass of magma that invaded earth's crust but did not reach surface. |
| Granite | Coarse-grained igneous rock dominated by light-colored minerals, consisting of about 50 percent orthoclase, 25 percent quartz, and balance of plagioclase feldspars and ferromagnesian silicates. Granodiorites comprise 95 percent of all intrusive rocks. |
