which term describes the way that a mineral reflects light
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- This is called the luster of the mineral.   The luster of a mineral is the way its surface reflects light. Most  terms used to describe luster are self-explanatory: metal…lic,  earthy, waxy, greasy, vitreous (glassy), adamantine (or brilliant,  as in a faceted diamond). 14 people found this useful. Qwertyghj63.
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- A streak plate-streak shows the true color of a mineral. Photo by Patrick Laird ©. The streak of a mineral is the true color of the mineral and is quiet helpful in identifying minerals. It is easiest to rub the mineral across a streak plate in order to view the powdered residue (streak). The best streak plates are unglazed white porcelain tiles.
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Star of India (gem) The milky quality of the stone is caused by the traces of the mineral rutile, which is also responsible for the star effect, known as asterism. The tiny fibers of the mineral, aligned in a three-fold pattern within the gem, reflect incoming light into the star pattern.
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Minerals of the Earth's Crust the appearance of a mineral, least accurate way to identify a mineral ex - Sulphur is yellow
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Industrial fishing and dynamite fishing are destroying our oceans at a rapid rate, endangering both wildlife and our food source. What can be done? What was it like spending time with the Vezo? The Vezo are only on that little island because of the lack of fish on Madagascar itself. So to catch anything at all, they have had to travel further and further away from everything that they know. They are a nomadic tribe, so they are used to traveling a lot, but they are there on this tiny tiny strip of sand, very far from anything.
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- uster is the way light reflects off a mineral. The two major divisions of luster are metallic and nonmetallic. A mineral that has a metallic luster looks like polished metal. Gold, aluminum, lead and copper all have metallic lusters.Minerals with metallic lusters that are not bright and shiny have dull metallic luster.Metallic luster Metallic luster. Mineral specimens often display different lusters as they weather. mineral that has a metallic luster looks like polished metal. Gold, aluminum, lead and copper all have metallic lusters. Minerals with metallic lusters that are not bright and shiny have dull metallic luster. Metallic luster Metallic luster. Mineral specimens often display different lusters as they weather.
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- The streak test is an easy way to determine the color of a mineral in powdered form. It is done by scraping a specimen of that mineral across an unglazed piece of porcelain known as a streak plate. Geology.com News Rocks Minerals Gemstones Articles Dictionary State Maps World Maps Store
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Color of Minerals A comparative evaluation is usually used in describing the color of minerals; the mineral’s color is compared to the color of some commonly known object or substance (indigo blue, apple green, lemon yellow, and blood red) or to mineral “color standards,” such as vermilion red and emerald green.
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- fluor·ite. A mineral consisting of calcium fluoride. Fluorite occurs in many colors (especially yellow and purple), usually in crystals shaped like cubes or octahedrons, and is often fluorescent in ultraviolet light.
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- COLOR AND STREAK. The first thing noticed about a mineral is its color. It is sometimes helpful in identifying a mineral, but shouldn't be the basis for identification. Some minerals are consistently one color, such as malachite, which is green.
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- Rose quartz from certain localities in South Dakota exhibits distinct asterism . Asterism refers to a. rayed or star-shaped figure of light on the surface of a mineral sample. If a rose quartz sample exhibits asterism , it is called. star rose quartz.
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Definitions Streak. •. streak. the color of a mineral in powdered form. • Streak is more reliable than color for the identification of. minerals. • Streak is determined by rubbing some of the mineral. against an unglazed ceramic tile called a. streak plate. . Minerals of Earth’s Crust Section 1 Physical Properties of Minerals, continued Luster • luster the way in which a mineral reflects light• A mineral is said to have a metallic luster if the mineral reflects light as a polished metal does.
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Reading: Physical Characteristics of Minerals When a mineral breaks in one direction, leaving a single flat surface (cleavage plane). When a mineral breaks into very thin sheets, like mica minerals, the pinacoidal cleavage is called micaceous. Not all minerals have cleavage. All minerals will have some form of fracture.
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What Characteristics Do All Minerals Share? What are some characteristics of all minerals? Color is one of the most important distinguishing characteristics of minerals. Minerals vary widely in color: some are translucent and appear as white or light gray, even pastel, while others are darker and reflect light. Streak refers to the color that a mineral takes on when ground into a powder. Along with hardness, it is an important characteristic.
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Mineral Streak Geologists also look at the color of the mineral, but they know that color can be misleading! The mineral quartz, for example, is commonly seen in clear, pink, and brown forms. Sometimes, the outer surface of a rock can react with air, giving it a different color. The streak of a mineral is the color of the powdered form of the mineral, and is often a more useful clue than the apparent color of the mineral alone.
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- Reflection. is the bouncing of light waves off a surface. Reflection. occurs when light rays bounce, or reflect, from a surface back to our eyes. Some objects reflect more light rays than others. White reflects all color frequencies and when these colors all blend, they look white.
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- Lustre is a mineral characteristics that desribes whether and how light is reflected off a surface of a mineral. The nature of the mineral surface and the amount of light that is absorbed determine lustre. Lustre can be metallic (chalcopyrite), dull (hematite), greasy (halite), vitreous (quartz) or silky (gypsum).
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Streak Mineral Properties. What is streak? The streak of a mineral is the color of the powder left on a streak plate (piece of unglazed porcelain) when the mineral is scraped across it. The streak plate has a hardness of glass, so minerals with a Mohs Hardness >7 will scratch the streak plate and won't powder the mineral. Where do you observe streak? A mineral’s streak is determined by rubbing it on a streak plate, which is a piece of unglazed porcelain. The streak plate is essentially a type of glass, so it isn't used on minerals with hardness greater than 7.
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Calcite - Double refraction Transparent calcite has an odd property called 'double refraction'. You can see through it, but you see two images rather than just one. Here, we are looking at the word calcite through it. You can see both images, and a rainbow. If you turn the calcite round, then one image stays the same, while the other moves round it.
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MINERAL PROPERTIES: STREAK MINERAL PROPERTIES: STREAK. Streak is the color of a crushed mineral's powder. The color of a mineral's powder may differ from the actual color of the mineral. This property can be useful for mineral identification. Almost every mineral has an inherent streak color, no matter what color the actual mineral is. For example, Calcite occurs in many different colors, shapes, and varieties. But every single variety of Calcite has a white streak. A streak is useful in distinguishing two minerals with the same color but different streak.
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- Fluorescence is a greatly misunderstood concept. Fluorescence is the reaction of trace minerals within the diamond that cause the diamond to glow when exposed to ultraviolet light.
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MINERAL PROPERTIES: LUSTER Metallic-Minerals with a metallic luster are opaque and reflective, like metal. The metal lic elements, most sulfides, and some oxides belong in this category. Submetallic-Describes a mineral that is opaque to nearly opaque and reflects well. Thin splinters or sections of submetallic minerals are translucent. Vitreous-This luster accounts for roughly 70 percent of all minerals.
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- Mineral Luster. Luster is a description of the way a mineral surface looks when light reflects off of the surface. Luster has two categories, metallic and nonmetallic.uster is a description of the way a mineral surface looks when light reflects off of the surface.
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Fluorescent Minerals Minerals with phosphorescence can glow for a brief time after the light source is turned off. Minerals that are sometimes phosphorescent include: calcite, celestite, colemanite, fluorite, sphalerite, and willemite. Thermoluminescence is the ability of a mineral to emit a small amount of light upon being heated.
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What is streak? The streak of a mineral refers to the color left on a streak plate after rubbing a mineral across its surface. A streak plate can be as simple as the unglazed side of a porcel…ain tile. The streak is the mineral in a powdered form from abrasion with the hard, slightly textured surface of the unglazed porcelain streak plate.
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Minerals that look like plastic have what kind of luster? Luster (or Lustre) is a description of the way light interacts with the surface of a crystal,rock or mineral-For example a metallic lustre or silky lustre.2 people found this useful. Edit.uster (or Lustre) is a description of the way light interacts with the surface of a crystal,rock or mineral-For example a metallic lustre or silky lustre. 2 people found this useful.