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EXAMPLE Mineral Luster

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1 EXAMPLE Mineral Luster
Explanation: The way light reflects off a mineral’s surface. Instructions: 1. Shine a flashlight on the mineral, or hold it up to a light. 2. Determine if the mineral is metallic in appearance (looks like a chunk of silver or gold metal) or non-metallic (doesn't look like a chunk of metal). 3. If it is non-metallic, compare it to the minerals on a luster chart to determine what category it falls under. EXAMPLE This is an example of the information that is needed for one section of the Minerals Property Book. The example shows “Luster”. Explanations are basically a definition of the property, found in their vocabulary, in the textbook, or even online at reputable websites. The visual can be drawn or printed, but if it is from the internet please include the source (you can list sources on a separate page at the end). The visual should show how the test is done, OR should provide a reference (like a chart, a table, or examples) that should be used to test this property. Instructions are trickier – based on what you read about the property you need to determine how a scientists tests this property. What tools are needed? How is the test done? Are there any scales, charts, or examples that I should be using as a reference?

2 EXAMPLE Mineral Luster
Explanation: The way light reflects off a mineral’s surface. Instructions: 1. Shine a flashlight on the mineral, or hold it up to a light. 2. Determine if the mineral is metallic in appearance (looks like a chunk of silver or gold metal) or non-metallic (doesn't look like a chunk of metal). 3. If it is non-metallic, compare it to the minerals on a luster chart to determine what category it falls under. Mineral Luster Chart: Adamantine - very gemmy crystals Brilliant –very shiny and reflective Dull - just a non-reflective surface of any kind Earthy - the look of dirt or dried mud Fibrous - the look of fibers Glassy – allows light through, transparent Greasy - the look of grease Gumdrop - the look a sucked on hard candy Metallic - the look of metals Pearly - the look of a pearl Pitchy - the look of tar Resinous - the look of resins such as dried glue or chewing gum Silky - the look of silk, similar to fibrous but more compact Submetallic - a poor metallic luster, opaque but reflecting little light Vitreous - the most common luster, it simply means the look of glass Waxy - the look of wax EXAMPLE This page just shows that a “visual” does not have to be a picture. This chart lists many different words/categories that are used to describe a mineral’s luster, and would be used as a reference when doing a luster test.


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