Types of Luster, Lecture notes of Geology

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6U2 - 6(C) test the physical properties of minerals, including hardness, color, luster, and

streak

Types of Luster

BRITTLE A term to describe how easily a substance breaks. cleavage The atoms are arranged so perfectly that crystals break along clean lines conductivity How well it allows electricity to move through it. DUCTILE Can be drawn into thin wire.

hardness measure of how easily a mineral can be scratched. luster property of metals and alloys that describes having a shiny appearance or reflecting light. MAGNETISM When an object is attracted to metal. MALLEABLE A term used to describe material that can be hammered or rolled into sheets. (Think mallet)

Chemical Sedimentary Rock Sedimentary rock that forms when minerals precipitate from a solution or settle from a suspension. Example: gypsum coal Interesting rock composed of the remains of plants that lived in tropical swamps millions of years ago. Can be lower quality (sedimentary) or be acted upon by heat and pressure (metamorphic). crystal solid in which the atoms are arranged in an orderly, repeating pattern. Extrusive Igneous Rock Igneous rock that cools on the surface of the earth so it cools very quickly and has little time for crystals to form (small crystals); may have vesicles (air pockets). Example: Scoria feldspar Contains many different colors,.,^ A group of silicate minerals. They are over 50% of Earth's crust. if you find a full crystal they will be in a coffin shape

galena Composition: Lead sulfide. May contain impurities, such as silver, arsenic, antimony, and copper geologist A scientist who studies the earth graphite ..., a greasy, natural carbon material that is used in making pencils halite ..., Clear in color, hardness of 2.5, smells and tastes salty, Colorless to white; Cubic (cleavage in 3 directions @ 90 degrees); halide; salty taste; use: salt hematite ..., Black and shiny, dark gray and dull, or rusty red, almost always cool to the touch. Streak- red.

pyrite Fool's gold, often found in cubic or hexagonal crystals, blackish green streak., Brass yellow metallic luster, Dark Gray streak; 6+; Fracture; Gold, white, gray; quartz A mineral found in sand, it is used for making glass as well as electronic equipment and watches., - Glassy looking- transparent or translucent mineral which varies in color from white and grey to smoky shale A sedimentary rock formed by the deposition of successive layers of clay. slate A type of Metamorphic rock that was once shale rock formed by heat and pressure. sulfur (S) found^ mostly in soft tissues as a component of organic compounds, is distributed widely throughout the body and in every cell and makes up about .15% of body weight

talc Grayish/Greenish, Dull or greasy luster, medium weight, white streak, 1 hardness, cleavage, feels soapy.