a transparent purple variety of quartz; used as a gemstone
http://www.conservapedia.com/Amethyst Amethyst is a variety of transparent quartz, used as a gemstone in jewelry. It is a deep clear violet or purple color, and has a hardness rating of 7 on the Moh's Scale.
dark brown to black mica found in igneous and metamorphic rock
http://www.conservapedia.com/Biotite Biotite is a common rock-forming mineral of the mica family. Biotite is a black or dark brown silicate rich in iron, magnesium, potassium, aluminum, and, of course, silica.
a ductile malleable reddish-brown corrosion-resistant diamagnetic metallic element; occurs in various minerals but is the only metal that occurs abundantly in large masses; used as an electrical and thermal conductor
a solid formed by the solidification of a chemical and having a highly regular atomic structure
http://www.conservapedia.com/Crystal A crystal is a substance in which the constituent atoms are arranged in a consistent, repetitive, and therefore orderly pattern. Crystals are extremely common, forming the basis for many rocks and minerals.
very hard native crystalline carbon valued as a gem
http://www.conservapedia.com/Diamond Diamond is an allotrope of carbon, and can be formed when carbon atoms are arranged in a tetrahedral fashion when put under immense amounts of heat and pressure.
any of a group of hard crystalline minerals that consist of aluminum silicates of potassium or sodium or calcium or barium
http://www.conservapedia.com/Feldspar Of all of the minerals in the Earth's crust, the aluminosilicate, feldspar, is the most common. It is a very useful industrial mineral that finds applications in making glass, plumbing fixtures, tile and pottery. These uses in the United States accounted for about 630,000 ton of U.S. produced feldspar valued at about $27.4 million.
a soft yellow malleable ductile (trivalent and univalent) metallic element; occurs mainly as nuggets in rocks and alluvial deposits; does not react with most chemicals but is attacked by chlorine and aqua regia
any of various minerals consisting of hydrous silicates of aluminum or potassium etc. that crystallize in forms that allow perfect cleavage into very thin leaves; used as dielectrics because of their resistance to electricity
a hard glossy mineral consisting of silicon dioxide in crystal form; present in most rocks (especially sandstone and granite); yellow sand is quartz with iron oxide impurities
a soft white precious univalent metallic element having the highest electrical and thermal conductivity of any metal; occurs in argentite and in free form; used in coins and jewelry and tableware and photography
a mineral that is a complex borosilicate and hydroxide of aluminum containing iron and magnesium and calcium and lithium and sodium; it is usually black but occurs in transparent colored forms that are used as gemstones
amalgam
