Chemical Composition, Physical And Optical Propeties And Uses Of Mineral OLIVINE:
Chemical composition:
Olivine is a silicate mineral, composed mainly of forsterite (Mg2SiO4) or fayalite (Fe2SiO4), or a mixture of both.
Physical properties:
Color: Olivine can vary in color from yellowish green to brownish green.
Luster: Olivine has a vitreous or glassy luster.
Transparency: Olivine can be transparent to translucent.
Crystal habit: Olivine typically forms as prismatic or stubby crystals.
Hardness: Olivine has a Mohs hardness of 6.5-7.
Specific gravity: Olivine has a specific gravity of 3.2-4.3.
Cleavage: Olivine has no cleavage.
Fracture: Olivine has a conchoidal fracture.
Magnetic properties: Olivine is not magnetic.
Thermal conductivity: Olivine has a low thermal conductivity.
Optical properties:
Refractive index: Olivine has a refractive index of 1.65-1.69.
Optic sign: Olivine is uniaxial positive.
Dispersion: Olivine has a moderate dispersion.
Pleochroism: Olivine exhibits weak pleochroism, appearing yellowish green to greenish yellow in different orientations.
Birefringence: Olivine has a low birefringence of about 0.005.
Extinction: Olivine has an extinction angle of about 15-20 degrees.
Interference colors: Olivine typically exhibits first-order gray or yellow interference colors.
Relief: Olivine has a moderate relief.
Optic axis: Olivine has a single optic axis.
Uses:
Olivine is a mineral that is used in several industrial applications, including:
Refractory materials: Olivine is used as a refractory material in the steel industry, due to its high melting point and good thermal stability.
Sand blasting: Olivine sand is used as a abrasive in sand blasting, due to its angular shape and low dust emissions.
Fertilizer: Olivine has been proposed as a source of magnesium for agricultural soils, to improve plant growth.
Environmental Remediation: Olivine can be used to sequester carbon dioxide (CO2) from the atmosphere by weathering, which can help to mitigate the effects of climate change.
Jewelry: Olivine is used in jewelry making, due to its durability and variety of colors.
Please note that these properties can vary depending on the exact composition and impurities present in the mineral specimen.
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