And then there was light lusseyr
When God said, “Let there be light,” it would seem he excited the atoms that he had created by putting energy into his creation, causing atoms to absorb energy and release light. As they de-excite they give off photons which make up visible light and other electromagnetic waves. Once excited atoms tend to want to de-excite, to go back to the condition they were in. An easy way to excite atoms is to heat them up. Atoms become excited by absorbing light from another source or being struck by other particles, which pass on energy. Light is produced when atoms gain extra energy and enter what is called an “excited” state. 5God called the light “day,” and the darkness he called “night.” And there was evening, and there was morning–the first day. 4God saw that the light was good, and he separated the light from the darkness. Genesis 1:3-5 describes how God created light: 3And God said, “Let there be light,” and there was light. Once God had established the basic building blocks of creation, he spoke light into existence. BUILDING STABLE CHILDREN IN UNSTABLE TIMES.Extreme caution about your conclusion is indicated here. If the sample reflects all light in a mirror-like (not glassy) fashion, then mineral may be ( but might not be) metallic. best to find a thin edge), then the mineral is non-metallic. If the sample absorbs and transmits any light, indicated by a glow, (e.g. Observe any light passing through the mineral. Orient the sample and look through the thinnest edge or corner. Hold the mineral in front of a light (the brighter, the better). For our quick-and-dirty assessment of luster at this time, we don't need to determine the type of non-metallic reflection (e.g., glassy, pearly, earthy, etc.). We identify this type of reflection as non-metallic.
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As the mineral is turned against the overhead light, we either observe a flash that does not resemble polished metal. We identify this type of reflection as metallic. As the mineral is turned against the overhead light, we observe a flash described as that from a polished metal surface. Observe the reflection of light from any flat surfaces. Rotate the sample back-and-forth to reflect light from a source. Hold the sample to orient it with any planar (flatter) surfaces facing an overhead light. A wrong determination of luster will be apparent, thus sending one to the other category for further assessment. For example, if one misidentifies a mineral as having a non-metallic luster when it actually exhibits a metallic luster, one would then discover with other properties that the combination of other properties does not match minerals in the non-metallic group. So we downgrade the importance of luster as a diagnostic property. Other properties are more easily determined with less potential error, and lead more directly to the identification of the mineral. Check out the section on electrical conductance for details.Įrrors/Suggestions: Contact Scott Brande (see footer).Ĭaution - learning to identify the particular type of luster takes practice, and for the beginner, may be difficult.
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And all that's needed are $1 flashlights.
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Check the Mineral Bank for this and additional information.īottom Line: I created a replacement activity for this traditional observation of luster - the flashlight circuit test. leading to fewer errors and a faster route to the identification of a mineral. Other physical properties are more easily and definitively determined, such as electrical conductance, hardness, streak, reaction to acid, magnetism, etc. A dark colored sample of weathered magnetite (metallic luster) might be mistaken for an earthy sample of hematite (non-metallic luster), but these two will differ in other properties, for example magnetism. In an introductory course, luster is a described as a property of light reflection that separates metallic from non-metallic minerals.ĭetermining luster can be difficult for a beginner.