The Mineral Identification Key: ... or look dull or earthy, etc. A mineral has a characteristic density. Introduction. Streak is the color of the powder. When found as red corundum, it is called ruby. Many minerals, such as the quartz in the Figure above, do not have streak. 1. Color should be considered when identifying a mineral, but should never be used as the major identifying characteristic. In the mineral industry, applications of ANNs are quite limited. An asterisk (*) means the rock contains only minor amounts of the mineral. The minerals that occur in the selected colors will be displayed on the next page. Every other color, including blue, is called sapphire. 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 the color of a mineral’s powder. Ruby & Sapphire – These precious gemstones are the same mineral, corundum. Mineral Name Physical Properties Geologic Setting Industrial Uses Biotite1 (K, Mg, Fe, Al Silicate) Luster nonmetallic. Minerals have distinctive properties that can be used to help identify them. 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 . Mohs Hardness Scale is used to compare the hardness of minerals. The color of gems and semiprecious stones is one of their main qualitative (gem) characteristics. 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 This paper reports some promising results on the identification of minerals using color parameters from images of thin sections. Hardness 2.5-4. Streak is the color of the powdered mineral, which is usually more useful for identification than the color of the whole mineral sample. The ANN of this study which uses color parameters as inputs was able to identify minerals with an accuracy of 81–98%. Minerals that are the same color may have a different colored streak. Mineral Identification Table Minerals for This Lab and Some Physical Properties They Possess. Rubbing the mineral on a streak plate will produce a streak. Platy Search by Color Select a color below. Identification of minerals is an essential step for the task of rock analysis. Quartz is said to have a glassy (or vitreous) luster, but its color may be purple, rose, … Color dark green, brown, or black. Streak is a more reliable property than color because streak does not vary. Ruby is the birthstone for July and Sapphire is … Luster should not be confused with color: A brass-yellow pyrite crystal has a metallic luster, but so does a shiny grey galena crystal . 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