The ANN of this study which uses color parameters as inputs was able to identify minerals with an accuracy of 81–98%. Search by Color Select a color below. Identification of minerals is an essential step for the task of rock analysis. Rubbing the mineral on a streak plate will produce a streak. When found as red corundum, it is called ruby. Streak is the color of the powder. Luster should not be confused with color: A brass-yellow pyrite crystal has a metallic luster, but so does a shiny grey galena crystal . Minerals have distinctive properties that can be used to help identify them. Mineral Name Physical Properties Geologic Setting Industrial Uses Biotite1 (K, Mg, Fe, Al Silicate) Luster nonmetallic. Many minerals, such as the quartz in the Figure above, do not have streak. Quartz is said to have a glassy (or vitreous) luster, but its color may be purple, rose, … It is the hardest mineral on Earth, second to diamond. Ruby is the birthstone for July and Sapphire is … The color of gems and semiprecious stones is one of their main qualitative (gem) characteristics. An asterisk (*) means the rock contains only minor amounts of the mineral. In mineralogy, color is one of the primary diagnostic properties of natural compounds, of great importance in geological prospecting for the identification of minerals. This paper reports some promising results on the identification of minerals using color parameters from images of thin sections. Introduction. Minerals that are the same color may have a different colored streak. 1. way light reflects from a mineral 2. way a mineral breaks under stress 3. reveals true, natural color of a mineral 4. least reliable property for identification Hardness 2.5-4. Streak. Every other color, including blue, is called sapphire. The minerals that occur in the selected colors will be displayed on the next page. Color dark green, brown, or black. A mineral has a characteristic density. Mineral Identification Guide Complete with photos and information about each mineral’s distinguishing characteristics, this mineral identification guide has been designed to assist you in identifying the minerals provided in the Deeper and Deeper and Mining Matters II kits. Streak is a more reliable property than color because streak does not vary. Platy Streak is the color of a mineral’s powder. Mohs Hardness Scale is used to compare the hardness of minerals. 1. XRD), manual mineral identification using optical microscopy, which is based on simple color- and texture- examining of the minerals, is still widely used and performs good reliability and reasonable accuracy . Ruby & Sapphire – These precious gemstones are the same mineral, corundum. Color should be considered when identifying a mineral, but should never be used as the major identifying characteristic. 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