Minerals possess a number of physical properties that aid in their identification. These are listed below with a brief description:
Color--The color of the specimen as it appears to the naked eye under normal lighting conditions. Some minerals such as gold will only appear as one color, but due to impurities and Crystal Light distortion, many minerals can appear in multiple colors. Therefore, observable specimen color is the least effective property in identification.
Streak--The color of a mineral in powdered form. A streak test is performed by dragging a freshly cleaved mineral surface across an unglazed porcelain surface. If the mineral is less hard than the porcelain, it will leave a stripe of color (the mineral in a powdered state). This is the true color of a mineral specimen as it lessens the impurity impact and eliminates the light distortion from the crystal. Although a mineral may have multiple observable specimen colors, it will only have one streak color.
Luster--Refers to the absorption, reflection, or refraction of light by the surface of a mineral. Minerals possess various lusters that are somewhat self-explanatory such as dull, earthy, adamantine, metallic, glassy, metallic, silky, greasy, pearly, and resinous.
Fluorescence--Some minerals fluoresce in ultraviolet light, and some minerals specimens may appear to fluoresce due to fluorescent mineral impurities, or due to locality. This is not an extremely reliable indicator property but can be used in conjunction with other identification properties.
Chemical Composition--Minerals are chemicals, either elements or compounds found naturally in the Earth. Some minerals have a fixed chemical composition, and some minerals have a rigid set of chemical composition parameters that allow for the replacement of certain elements with other elements. Chemical properties can be tested with the use of a blowpipe, flame color, bead test, and laboratory solution tests.
Hardness--Minerals are identified roughly by their hardness based on the Mohs scale of mineral hardness, a list of ten minerals from #1 (softest) to #10 (hardest). All minerals will fall somewhere along the scale, based on their ability to scratch any mineral with a number lower than theirs and their inability to scratch any mineral with a number higher than theirs.
Mohs Scale of Mineral Hardness
Specific Gravity--Is the relative weight of a mineral as compared to the weight of an equal volume of water. The specific gravity is also referred to as density and is expressed normally as an average of a small range of densities.
Some Common Minerals and Their Specific Gravity
Crystal Form--A mineral's crystals form into one of six mineral crystal systems: cubic, tetragonal, hexagonal, orthorhombic, monoclinic, or triclinic. The crystal form reflects the structure of the molecules and formation environment of the mineral. Although sometimes difficult, identification of a mineral's crystal form is an invaluable aid to mineral identification along with the other mineral properties.
Optical Properties--Used mainly be scientists, X-rays are sent through thin slices of mineral, producing identifying patterns of light which measure their index of refraction which is distinct for each mineral.
Cleavage--The way some minerals split along planes which are related to their mineral structure, parallel to any crystal faces. Cleavage is measured in degrees of perfection from poor, to fair, good, perfect, and eminent, and are described by the number and direction of cleavage planes. Some minerals do not show cleavage, but fracture in a way other than along any cleavage plain.
Magnetism--Certain minerals exhibit magnetism or an attraction to a magnet, and some will display this property only when heated.
Electrical Properties--Some minerals when heated or rubbed will develop an electrical charge. Others will be able to control radio frequencies.
Melting Point--A pure mineral will posses a melting point which can be tested with a high temperature flame until it fuses at the edges.
Some minerals can be identified by their unique characteristics. Sulfur can be identified by its smell, while halite (salt), by its taste.
Minerals differ from each other in many ways. A few are: hardness, color, density, chemistry, crystallography, fluorescence, formational environment, etc.
minerals differ in appearance and texture
its a nuetrons
They form when layers of minerals lay on top of each other
Almost all rocks made of minerals, but different rocks contain different mixtures of minerals.
life would be different without minerals because their woul'nt be minerals
Rocks are solid substainces that are made of 2 or more minerals and can have organic matter in them as well. On the other hand, minerals are naturally formed inorganic solids that have definite crystalline structures. Rocks and minerals are made through different processes.
which minerals can form are alike and how they are different
minerals differ in appearance and texture
Minerals found next to each other are called adjacent.
Rock
They form when layers of minerals lay on top of each other
They form when layers of minerals lay on top of each other
They form when layers of minerals lay on top of each other
They form when layers of minerals lay on top of each other
some other way the scientist can compare minerals is crashing each other or take some elements and them revise it.
they are different to each other
Because they each are made of different elements and therefore have different chemical compositions.
Vitamins are substances that occur naturally in certain food like vitamin C in citrus fruits. Minerals are solid inorganic substances with chemical composition like Calcium in milk.
Minerals are the building blocks of rocks. They are non-living, solid, and, like all matter, are made of atoms of elements. There are many different types of minerals and each type is made of particular groups of atoms. Different types of minerals have different crystal shapes.