Colour: The colour of any object is a light dependent property- it is the appearance of the particular object in light (darkness destroys colour). In this paper, some luminescence properties concerning dating were further explored, and the feasibility of optical dating using halite as a dosimeter was demonstrated. ADVERTISEMENTS: In this article we will discuss about the optical and physical properties of minerals. Physical and optical properties of halite, with pictures and videos. The luminescence properties such as signal resetting, dose response, thermal stability, have shown that halite is a suitable material for optical dating . Differentiation of halite from similar salts: Halite crystals display the same optical density in every direction so that the speed and orientation of linear polarized light waves are not distorted, therefore, when viewed between crossed polars, the crystals are not visible, i.e., they show "extinction". Optical Properties of Minerals: Luster, Light Transmission, Color & Streak. Optical properties: Isotropic; Occurrences. Halite (rock salt) is one of few materials, which have an ability to store information on absorbed dose of ionizing radiation. Optical Properties of Halite : Optical Data: Isotropic, n=1.544. Previous studies of optically stimulated luminescence (OSL) response in sodium chloride indicated coexistence of fading, inverse fading and regeneration effect using newly developed variable delay optically stimulated luminescence technique (VD-OSL). Calculated Properties of Halite : Electron Density: Bulk Density (Electron Density)=2.07 gm/cc note: Specific Gravity of Halite =2.16 gm/cc. ... and even salt or halite in food seasoning. Salt beds may be hundreds of meters thick and underlie broad areas. Halite occurs in vast beds of sedimentary evaporite minerals that result from the drying up of enclosed lakes, playas, and seas. 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