Lab 9 - Mineral Identification All rocks are composed of one or more minerals. A hand lens is a small, double-lens magnifying glass that has a magnification power of at least 8× and can be purchased at some bookstores and nature stores. Fracture is not always the same in the same mineral because fracture is not determined by the structure of the mineral. For example cleaned polished pieces of chrome, steel, titanium, copper, and brass all exhibit metallic luster as do many other minerals. Mineralogists are scientists who study minerals. Garnet. A close-up view of sodium chloride in a water bubble aboard the International Space Station. Standard names for luster include metallic, glassy, pearly, silky, greasy, and dull. (b) Quartz is not sparkly and has a vitreous, or glassy, luster. Using a glass plate, see if the mineral scratches it. In order to be able to identify rocks you have to know how to recognize those key minerals that make of the bulk of rocks. Examples include pyrite, FeS2, galena, PbS, and sphalerite, ZnS in its pure zinc form. What is the mineral’s color? Quartz has no mineral cleavage and fractures the same irregular way glass breaks. Mineral Identification. For example, the sulfides are based on the sufur ion, S2–. Streak describes the color of a finely crushed mineral. Together, the chemical formula (the types and proportions of the chemical elements) and the crystal lattice (the geometry of how the atoms are arranged and bonded together) determine the physical properties of minerals. Density describes how much matter is in a certain amount of space: density = mass/volume. Check out the mineral in Figure 1. Figure 4. One reason gemstones are beautiful is that the cleavage planes make an attractive crystal shape with smooth faces. If a mineral has space while it grows, it may form natural crystals, with a crystal shape reflecting the geometry of the mineral’s internal crystal lattice. They are also classified on the basis of their hardness and their cleavage or fracture. The mineral olivine (/ ˈ ɒ l ɪ ˌ v iː n /) is a magnesium iron silicate with the formula (Mg 2+, Fe 2+) 2 Si O 4.It is a type of nesosilicate or orthosilicate.The primary component of the Earth's upper mantle, it is a common mineral in Earth's subsurface, but weathers quickly on the surface. Anhydrite, CaSO4, is a sulfate. To see mineral cleavage, hold the mineral up beneath a strong light and move it around, move it around some more, to see how the different sides reflect light. Fracture is breakage, which occurs in directions that are not cleavage directions. A mineral looks dry and chalky. This section will introduce you to minerals. The most common mineral that is strongly magnetic is the mineral magnetite. Mineral Identification. All rocks except obsidian and coal are made of minerals. (c) Sulfur reflects less light than quartz, so it has a resinous luster. Look at it closely on all visible sides to see how it reflects light, Evaluate any other physical properties necessary to determine the mineral’s identity. The streak of hematite across an unglazed porcelain plate is red-brown. Some minerals have special properties that can be used to help identify them. You begin by following step-by-step procedures and looking up a lot of things. Pinterest. Quiz *Theme/Title: Rock and Mineral * Description/Instructions ; This quiz will compare rocks and minerals. by petenge Plays Quiz not verified by Sporcle . Examples include iron oxides such as hematite, Fe2O3 and magnetite, Fe3O4, and pyrolusite, MgO. This rough diamond shows its octahedral cleavage. The solid earth is made of rocks, which are made of minerals. Quartz is said to exhibit conchoidal fracture. Minerals such as quartz have a non-metallic luster. Quickly memorize the terms, phrases and much more. To check streak, scrape the mineral across an unglazed porcelain plate (Figure  below). A mineral that exhibits consistently breaks, or cleavage Purple quartz, known as amethyst, and clear quartz are the same mineral despite the different colors. These have the polyatomic sulfate ion, (SO4)2–, as the anion. To identify your mineral, you'll need a streak plate or something like it. To compare the hardness of two minerals see which mineral scratches the surface of the other. Mineral examples: quartz (agate), malachite, rhodochrosite, and fluorite.The photo above shows rhodochrosite cabochons that display a banded habit. Which properties of a mineral describe the way it breaks apart? Category: Silicate mineral; Chemical formula: Be 3 Al 2 (SiO 3) 6; In its pure form, this mineral is colourless. Each mineral has its own specific combination of atoms that cannot be found in any other mineral. Start studying mineral identification worksheet. To identify a mineral, you look at it closely. A tiny amount of iron makes the quartz purple. Conchoidal fracture is the way a thick piece of glass breaks with concentric, curving ridges on the broken surfaces. First, you need good light and a hand lens or magnifying glass. First, you need to become familiar with the physical properties of minerals and how to recognize them. Additionally, Some minerals come in many different colors. One simple way to classify luster is based on whether the mineral is metallic or non-metallic. Quickly memorize the terms, phrases and much more. If you can identify several of these physical properties, you can identify the mineral. The possible number of cleavages a mineral may have are 1,2,3,4, or 6. An asterisk (*) means the rock contains only minor amounts of the mineral. Talc is commonly used as talcum powder to reduce friction, promote dry skin, and prevent rashes. Some minerals, such as quartz, form smooth curved surfaces when they fracture. Therefore, elements purified and crystallized in a laboratory do not qualify as minerals, unless they have also been found in nature. The shape of a crystal follows the symmetry of its crystal lattice. Share how … Some characteristics, such as a mineral’s hardness, are more useful for mineral identification. This mineral has shiny, gold, cubic crystals with striations, so it is pyrite. Quizlet study guide mineral identification answer key - Bing Science *Chapter 3 Section 1+2+3* Minerals+Mineral ... Ch. Practice identifying rocks and minerals for the science olympiad! Halite, NaCl, is a halide mineral. Fluorapatite, Ca5(PO4)3F, which makes your teeth hard, is a phosphate mineral. Carbonate minerals tend to dissolve relatively easily in water, especially acid water, and natural rain water is slightly acid. Cleavage surfaces can be distinguished by how they consistently reflect light, as if polished, smooth, and even. Except for the native element class, the chemical basis for classifying minerals is the anion, the negatively charged ion that usually shows up at the end of the chemical formula of the mineral. These are based on the carbonate ion, (CO3)2–. Gold (Au), native copper (Cu), and diamond and graphite, which are made of carbon, are all native element minerals. Color is readily observable and certainly obvious, but it is usually less reliable than other physical properties. Topaz from certain localities may also turn pink or colorless upon heating. There are six discussion questions. Fluorite forms octahedrons (Figure  below). Many minerals in an introductory geology lab do not exhibit their crystal form. How did the impurities get into the mineral? Are the individual crystals shiny or dull? The major classes of minerals are: Based on the polyatomic anion, (SiO4)4–, which has a tetrahedral shape. Learning mineral identification is like learning to cook. Luster: The quantity and quality of light reflected from the surface. Since some bonds are weaker than other bonds, each type of mineral is likely to break where the bonds between the atoms are weaker. The PowerPoint provides pi. Rock and Mineral identification. If more than 1 cleavage is present, and a device for measuring angles is not available, simply state whether the cleavages intersect at 90° or not 90°. All minerals have fracture. Can you name a unique property that would allow you to instantly identify a mineral that’s been described quite a bit in this chapter? Streak is a more reliable property than color because streak does not vary. Some minerals have other unique properties, some of which are listed in Table 3. An example of such a special property is the effervescent reaction of calcite to a weak solution of hydrochloric acid (5% HCl). While a mineralogist might use a high-powered microscope to identify some minerals, most are recognizable using physical properties. Minerals can be identified by their physical characteristics. (b) Sulfur reflects less light than quartz, so it has a resinous luster. Luster is how the surface of a mineral reflects light. Color is readily observable and certainly obvious, but it is usually less reliable than other physical properties. Explore. Determine the luster (metallic or nonmetallic) of your mineral. Introduction This Mineral Key is designed and intended for use on-line. Color is often useful, but should not be relied upon. Explain how the hardness of a mineral is measured. Are the individual crystals shiny or dull? Rock and Mineral identification. There are two complicating factors to remember here: (1) minerals do not always form nice crystals when they grow, and (2) a crystal face is different from a cleavage surface. Color is rarely very useful for identifying a mineral. Yellow-gold pyrite has a blackish streak, another indicator that pyrite is not gold, which has a golden yellow streak. Streak is the color of a mineral’s powder. You know then that the mineral’s hardness is between 5 and 6. Turquoise is prized for its striking greenish-blue color. The way in which a mineral breaks is determined by the arrangement of its atoms and the strength of the chemical bonds holding them together. Real gold, as seen in Figure 2, is very similar in color to the pyrite in Figure 1. Check out the mineral in Figure  below. Log in. Using their observations, students will use the Earth Science Reference Tables page 16 to help them identify each mineral. For that reason, minerals break apart in characteristic ways. Because these properties are unique to the mineral, careful observation of broken surfaces may aid in mineral identification. It is a relative, or nonlinear, scale. Mica has cleavage in one direction and forms sheets (Figure 7). Streak is a more reliable property than color because streak does not vary. These are based on the oxygen anion, O2–. Study Flashcards On Geology-Mineral Identification Quiz at Cram.com. Platy Fracture is a break in a mineral that is not along a cleavage plane. The chemical formula and crystal lattice of a mineral can only be determined in a laboratory, but by examining a mineral and determining several of its physical properties, you can identify the mineral. But a few minerals leave a distinctive streak that can be used to identify them. Many minerals, such as the quartz in the Figure 3, do not have streak. Hardness is the strength with which a mineral resists its surface being scraped or punctured. Fluorite forms octahedrons (Figure 8). Calcite is soft, and will not scratch glass. There are 26 mineral samples to identify. Not all minerals have cleavage. Some sulfides are mined as sources of such metals as zinc, lead, copper, and tin. Minerals that are opaque and shiny, such as pyrite, have a metallic luster. You can understand the properties of a silicate mineral such as crystal shape and cleavage by knowing which type of crystal lattice it has. 6th Grade Minerals Worksheet Mohs Scale By Lauren Allen Tpt Learn vocabulary terms and more with flashcards games and other study tools. Chrysotile has splintery fracture. Minerals such as quartz have a non-metallic luster. It is designed to highlight those physical properties that are unique to that mineral or assist in identification of that mineral. This outcome gives you the background needed to understand the terms used in identifying minerals. Other special properties may be encountered on a mineral to mineral basis. Learn mineral identification with free interactive flashcards. Metals usually fracture into jagged edges. Find the US States - … Yellow-gold pyrite has a blackish streak, another indicator that pyrite is not gold, which has a golden yellow streak. The premise behind this Key is similar to that of the identification keys found in some fern and wildflower books: Key diagnostic properties are used to direct users to tables where further information on "likely suspects" is found. This mineral is shiny, very soft, heavy, and gold in color, and is actually gold. The specific gravity of a substance compares its density to that of water. Students can observe the color, luster, shape, density, hardness, streak, and reaction to acid for each mineral. Many minerals, such as the quartz in the Figure above, do not have streak. These are made of nothing but a single element. Mineralogists have special terms to describe luster. Diamonds, on the other hand, have only one type of atom: carbon. In the minerals tables that accompanies this section, the minerals are grouped according to their luster and color. Different minerals may be the same color. Rocks And Minerals Gems Science Flag Jewels Gemstones. All silicate minerals are built of silicon-oxygen tetrahedra (SiO4)4– in different bonding arrangements which create different crystal lattices. Many minerals are colored by chemical impurities. Most minerals in the earth’s crust and mantle are silicate minerals. Sort minerals into the correct mineral class. 9 Rocks and ... Guide Mineral Identification Answer Keyfor 4th Grade : I ... Hardness is a mineral's ability to resist being scratched. (Hint: It is most likely found on your dinner table.). Minerals can cleave into polygons. A cleavage surface is formed when the mineral is broken. Fracture is a break in a mineral that is not along a cleavage plane. Figure 3. Those represent a single cleavage because the surfaces are all oriented in the same diretion. Since some bonds are weaker than other bonds, each type of mineral is likely to break where the bonds between the atoms are weaker. Many minerals are colored by chemical impurities. Greasy luster looks similar to the luster of solidified bacon grease. Observe and measure the properties of a mineral sample, and then use a key to identify the mineral. Mineralogists are scientists who study minerals. You know then that the mineral’s hardness is between 5 and 6. Students are not expected to know the answers to the Prior Knowledge Questions.] (a) Diamond has an adamantine luster. Identify additional properties that can be used to identify some minerals. Different minerals may be the same color. For example, all plagioclase has cleavage. For example, salt is a mineral that consists of sodium and chlorine ions bonded together in a repeating pattern. Hornblende. Another special property is magnetism. Streak is the color of a mineral’s powder. Can you match the minerals in Figure  below with the correct luster from Table above? Minerals are identified on the basis of their physical properties, which have been described in the the previous section. 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