GEOLOGY

Detailed explanation-1: -The type of mineral showing variable colour is? Explanation: Allochromatic minerals have a variable colour; the variety in colour is generally due to minute quantities of colouring impurities thoroughly dispersed in the mineral composition.

Detailed explanation-2: -Physical Impurities Impurities may produce color in minerals. Normally colorless calcite can be colored black by MnO2 or carbon. Tiny specks of red or green minerals can impart their color to minerals. For example, chlorite (green) in quartz, and hematite (red) in feldspar, calcite and jasper.

Detailed explanation-3: -Like all objects, a mineral’s color depends upon which wavelengths of light it absorbs and reflects. The atomic bonds within a mineral generally determine which wavelengths of light will be absorbed and which will be reflected.

Detailed explanation-4: -Silicates, oxides, sulfates, sulfides, carbonates, native elements, and halides are all major mineral groups.

Detailed explanation-5: -There are two types of minerals: macro minerals and trace minerals. Macro means “big” in Greek (and your body needs more macro minerals than trace minerals). The macro mineral group consists of calcium, arsenic, magnesium, sodium, potassium, chloride and sulphur.