{"id":103,"date":"2021-09-16T19:28:30","date_gmt":"2021-09-16T19:28:30","guid":{"rendered":"https:\/\/pressbooks.ccconline.org\/accphysicalgeography\/chapter\/2-6-mineral-properties-physical-geology-2nd-edition\/"},"modified":"2022-02-02T17:01:33","modified_gmt":"2022-02-02T17:01:33","slug":"2-6-mineral-properties-physical-geology-2nd-edition","status":"publish","type":"chapter","link":"https:\/\/pressbooks.ccconline.org\/accphysicalgeology\/chapter\/2-6-mineral-properties-physical-geology-2nd-edition\/","title":{"raw":"2.6 Mineral Properties \u2014 Physical Geology \u2013 2nd Edition","rendered":"2.6 Mineral Properties \u2014 Physical Geology \u2013 2nd Edition"},"content":{"raw":"
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2.6 Mineral Properties<\/h1>\r\nMinerals are universal. A crystal of hematite on Mars will have the same properties as one on Earth, and the same as one on a planet orbiting another star. That\u2019s good news for geology students who are planning interplanetary travel since we can use those properties to help us identify minerals anywhere. That doesn\u2019t mean that it\u2019s easy, however; identification of minerals takes a lot of practice. Some of the mineral properties that are useful for identification are as follows: color, streak, luster, hardness, crystal habit, cleavage\/fracture, density and a few others.\r\n

Color<\/h1>\r\nFor most of us, color is one of our key ways of identifying objects. While some minerals have particularly distinctive colors that make good diagnostic properties, many do not, and for many, color is simply unreliable. The mineral sulfur (2.6.1 left) is always a distinctive and unique yellow. Hematite, on the other hand, is an example of a mineral for which color is not diagnostic. In some forms hematite is deep dull red, but in others it is black and shiny metallic (Figure 2.6.2). Many other minerals can have a wide range of colors (e.g., quartz, feldspar, amphibole, fluorite, and calcite). In most cases, the variations in colors are a result of varying proportions of trace elements within the mineral. In the case of quartz, for example, yellow quartz (citrine) has trace amounts of ferric iron (Fe3+<\/sup>), rose quartz has trace amounts of manganese, purple quartz (amethyst) has trace amounts of iron, and milky quartz, which is very common, has millions of fluid inclusions (tiny cavities, each filled with water).\r\n\r\n\r\n\"The\r\n<\/a>\r\n
Figure 2.6.1 Examples of the colors of the minerals sulfur and hematite.<\/div>\r\n<\/div>\r\n

Streak<\/h1>\r\nIn the context of minerals, \u201ccolor\u201d is what you see when light reflects off the surface of the sample. One reason that color can be so variable is that the type of surface is variable. It may be a crystal face or a fracture surface or a cleavage plane, and the crystals may be large or small depending on the nature of the rock. If we grind a small amount of the sample to a powder we get a much better indication of its actual color. This can easily be done by scraping a corner of the sample across a streak plate (a piece of unglazed porcelain) to make a streak<\/span><\/strong>. The result is that some of the mineral gets ground to a powder and we can get a better impression of its \u201ctrue\u201d color (Figure 2.6.2).\r\n
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Figure 2.6.2 The streak colors of specular (metallic) hematite (left) and earthy hematite (right). Hematite leaves a distinctive reddish-brown streak whether the sample is metallic or earthy.<\/div>\r\n<\/div>\r\n

Luster<\/h1>\r\nLuster is the way light reflects off the surface of a mineral, and the degree to which it penetrates into the interior. The key distinction is between metallic<\/span><\/strong> and non-metallic\u00a0<\/span><\/strong>lusters<\/b>. Light does not pass through metals, and that is the main reason they look \u201cmetallic.\u201d Even a thin sheet of metal\u2014such as aluminum foil\u2014will not allow light to pass through it. Many non-metallic minerals may look as if light will not pass through them, but if you take a closer look at a thin edge of the mineral you can see that it does. If a non-metallic mineral has a shiny, reflective surface, then it is called \u201cglassy.\u201d If it is dull and non-reflective, it is \u201cearthy.\u201d Other types of non-metallic lusters are \u201csilky,\u201d \u201cpearly,\u201d and \u201cresinous.\u201d Luster is a good diagnostic property since most minerals will always appear either metallic or non-metallic. There are a few exceptions to this (e.g., hematite in Figure 2.6.1).\r\n

Hardness<\/h1>\r\nOne of the most important diagnostic properties of a mineral is its hardness. In 1812 German mineralogist Friedrich Mohs came up with a list of 10 reasonably common minerals that had a wide range of hardnesses. These minerals are shown in Figure 2.6.3, with the Mohs scale of hardness along the bottom axis. In fact, while each mineral on the list is harder than the one before it, the relative measured hardnesses (vertical axis) are not linear. For example apatite is about three times harder than fluorite and diamond is three times harder than corundum. Some commonly available reference materials are also shown on this diagram, including a typical fingernail (2.5), a piece of copper wire (3.5), a knife blade or a piece of window glass (5.5), a hardened steel file (6.5), and a porcelain streak plate (7). These are tools that a geologist can use to measure the hardness of unknown minerals. For example, if you have a mineral that you can\u2019t scratch with your fingernail, but you can scratch with a copper wire, then its hardness is between 2.5 and 3.5. And of course the minerals themselves can be used to test other minerals.\r\n
\r\n\"Mohs\r\n<\/a>\r\n
Figure 2.6.3 Minerals and reference materials in the Mohs scale of hardness. The \u201cmeasured hardness\u201d values are Vickers Hardness numbers. [Image Description]<\/a><\/div>\r\n<\/div>\r\n

Crystal Habit<\/h1>\r\nWhen minerals form within rocks, there is a possibility that they will form in distinctive crystal shapes if they formed slowly and if they are not crowded out by other pre-existing minerals. Every mineral has one or more distinctive crystal habits<\/span><\/strong>, but it is not that common, in ordinary rocks, for the shapes to be obvious. Quartz, for example, will form six-sided prisms with pointed ends (Figure 2.6.4a), but this typically happens only when it crystallizes from a hot water solution within a cavity in an existing rock. Pyrite can form cubic crystals (Figure 2.6.4b), but can also form crystals with 12 faces, known as dodecahedra<\/span><\/strong> (\u201cdodeca\u201d means 12). The mineral garnet also forms dodecahedral crystals (Figure 2.6.4c).\r\n
\r\n\"The\r\n<\/a>\r\n
Figure 2.6.4a Hexagonal prisms of quartz.<\/div>\r\n<\/div>\r\n
\r\n\"Cubes\r\n<\/a>\r\n
Figure 2.6.4b Cubic crystals of pyrite.<\/div>\r\n<\/div>\r\n
\r\n\"A\r\n<\/a>\r\n
Figure 2.6.4c A dodecahedral crystal of garnet.<\/div>\r\n<\/div>\r\nBecause well-formed crystals are rare in ordinary rocks, habit isn\u2019t as useful a diagnostic feature as one might think. However, there are several minerals for which it is important. One is garnet, which is common in some metamorphic rocks and typically displays the dodecahedral shape. Another is amphibole, which forms long thin crystals, and is common in igneous rocks like granite (Figure 1.4.2).\r\n\r\nMineral habit is often related to the regular arrangement of the molecules that make up the mineral. Some of the terms that are used to describe habit include bladed, botryoidal (grape-like), dendritic (branched), drusy (an encrustation of minerals), equant (similar in all dimensions), fibrous, platy, prismatic (long and thin), and stubby.\r\n

Cleavage and Fracture<\/h1>\r\nCrystal habit is a reflection of how a mineral grows, while cleavage and fracture describe how it breaks. Cleavage and fracture\u00a0 are the most important diagnostic features of many minerals, and often the most difficult to understand and identify. Cleavage<\/span><\/strong> is what we see when a mineral breaks along a specific plane or planes, while fracture<\/span><\/strong> is an irregular break. Some minerals tend to cleave along planes at various fixed orientations, some do not cleave at all (they only fracture). Minerals that have cleavage can also fracture along surfaces that are not parallel to their cleavage planes.\r\n\r\nAs we\u2019ve already discussed, the way that minerals break is determined by their atomic arrangement and specifically by the orientation of weaknesses within the lattice. Graphite and the micas, for example, have cleavage planes parallel to their sheets (Figures 2.2.5 and 2.4.5), and halite has three cleavage planes parallel to the lattice directions (Figure 2.2.6).\r\n\r\nQuartz has no cleavage because it has equally strong Si\u2013O bonds in all directions, and feldspar has two cleavages at 90\u00b0 to each other (Figure 2.6.5).\r\n
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Figure 2.6.5 Cleavage and fracture in potassium feldspar<\/div>\r\n<\/div>\r\nOne of the main difficulties with recognizing and describing cleavage is that it is visible only in individual crystals. Most rocks have small crystals and it\u2019s very difficult to see the cleavage within those crystals. Geology students have to work hard to understand and recognize cleavage, but it\u2019s worth the effort since it is a reliable diagnostic property for most minerals.\r\n\r\nOne last thing: it is important to recognize the difference between cleavage planes and crystal surfaces.\u00a0 As already noted, crystal surfaces are related to how a mineral grows while cleavage planes are related to how it breaks. In most minerals cleavage planes and crystal surfaces do not align with one-another.\u00a0 An exception is halite, which grows in cubic crystals and has cleavage along those same planes (Figure 1.4.1 and 2.2.6).\u00a0 But this doesn\u2019t hold for most minerals. Quartz has crystal surfaces but no cleavage at all.\u00a0 Fluorite forms cubic crystals like those of halite, but it cleaves along planes that differ in orientation from the crystal surfaces.\u00a0 This is illustrated in Figure 2.6.6.\r\n
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Figure 2.6.6 Crystal faces and cleavage planes in the mineral fluorite. The top-left photo shows a natural crystal of fluorite.\u00a0 It has crystal surfaces\u00a0 but you can see some future cleavage planes inside the crystal. The top-right photo shows what you can create if you take a crystal like the one on the left and carefully break it along its cleavage planes.<\/div>\r\n<\/div>\r\n

Density<\/h1>\r\nDensity<\/span><\/strong> is a measure of the mass of a mineral per unit volume, and it is a useful diagnostic tool in some cases. Most common minerals, such as quartz, feldspar, calcite, amphibole, and mica, have what we call \u201caverage density\u201d (2.6 to 3.0 grams per cubic centimeter (g\/cm3<\/sup>)), and it would be difficult to tell them apart on the basis of their density. On the other hand, many of the metallic minerals, such as pyrite, hematite, and magnetite, have densities over 5 g\/cm3<\/sup>. They can easily be distinguished from the lighter minerals on the basis of density, but not necessarily from each other. A limitation of using density as a diagnostic tool is that one cannot assess it in minerals that are a small part of a rock that is mostly made up of other minerals.\r\n

Other Properties<\/h1>\r\nSeveral other properties are also useful for identification of some minerals. For example, calcite is soluble in dilute acid and will give off bubbles of carbon dioxide. Magnetite is magnetic, so will affect a magnet. A few other minerals are weakly magnetic.\r\n

Image Descriptions<\/h3>\r\n\r\n\r\n\r\n\r\n\r\n
Figure 2.6.3 image description<\/caption>\r\n
<\/td>\r\nTalc<\/th>\r\nGypsum<\/th>\r\nCalcite<\/th>\r\nFluorine<\/th>\r\nApatite<\/th>\r\nFeldspar<\/th>\r\nQuartz<\/th>\r\nTopaz<\/th>\r\nCorundum<\/th>\r\nDiamond<\/th>\r\n<\/tr>\r\n<\/thead>\r\n
Measured Hardness<\/td>\r\n50<\/td>\r\n60<\/td>\r\n105<\/td>\r\n200<\/td>\r\n659<\/td>\r\n700<\/td>\r\n1100<\/td>\r\n1648<\/td>\r\n2085<\/td>\r\n7000<\/td>\r\n<\/tr>\r\n
Mohs Hardness<\/td>\r\n1<\/td>\r\n2<\/td>\r\n3<\/td>\r\n4<\/td>\r\n5<\/td>\r\n6<\/td>\r\n7<\/td>\r\n8<\/td>\r\n9<\/td>\r\n10<\/td>\r\n<\/tr>\r\n<\/tbody>\r\n<\/table>\r\n[Return to Figure 2.6.3]<\/a>\r\n

Media Attributions<\/h3>\r\n