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LMS Ch 5.2 DR
Identifying Minerals Directed Reading
Question | Answer |
---|---|
Mineralogists are scientists who?? | Examine, analyze, and classify minerals. |
Mineralogists identify minerals by?? | Studying the properties of minerals. |
Each mineral has specific properties that are a result of?? | Chemical composition and crystalline structure. |
What is one property of a mineral that is easy to observe?? | Color. |
Color alone is generally?? | Not a reliable clue for identifying a mineral sample. |
What is true of mineral color?? | Very small amounts of certain elements may greatly affect color. |
What causes the purple color of amethyst?? | Carbon, C; and Iron, Fe. |
What is another reason that color is unreliable in identifying minerals?? | Weathered surfaces may hide the color of minerals. |
What is streak?? | The color of the mineral in powdered form. |
The easiest way to observe the streak of a mineral is to?? | Rub some of the mineral against a streak plate. |
What is true of the streak’s color?? | It may differ from the color of the mineral in solid form. |
What kind of streak do metallic minerals generally have?? | Dark. |
What color is calcite in ordinary light?? | White. |
What color does calcite appear to be in ultraviolet light?? | Red. |
Minerals with the property of fluorescence?? | Absorb ultraviolet light and then produce visible light of various colors. |
Phosphorescence is the property that causes a mineral to?? | Glow after ultraviolet light is turned off. |
What is a chatoyancy?? | A appearance some minerals display in reflected light. |
What it chatoyancy also called?? | Cat’s-Eye Effect. |
Glassy Luster?? | Transparent quartz and other minerals that look like glass. |
Waxy Luster?? | Minerals that have the appearance of candle wax. |
Pearly Luster?? | Minerals such as mica. |
Brilliant Luster?? | Diamond, for example. |
Dull or Earthy Luster?? | Mineral that lacks any shiny appearance. |