Mineral exploration personnel have observed that although different colors and shapes of mineral crystals have different names and appearances, they may be crystals of the same chemical composition under different physical and chemical conditions, and generally have different structures. Physical characteristics: So different mineral types can have the same chemical composition. Which of the following options best support the above assertions:. ['Carbon dioxide and dry ice have different names and appearances.', 'Mineral crystals of different colors change color when exposed to air.', 'Analytical instruments can quickly determine the chemical composition of mineral crystals.', 'Silica can have 12 different mineral crystals.']