Table of Contents
How does apatite break?
Apatite is a brittle material. It breaks by both fracture and cleavage, but the cleavage is generally indistinct. Hexagonal apatite crystals are sometimes found in igneous and metamorphic rocks.
How much apatite is mined per year?
High-grade phosphate rock, the only commercial source of phosphorus, contains at least 10 percent elemental phosphorus in the form of apatite. As the base of the 25-billion-dollar-per-year global mining industry, more than 255 million tonnes of phosphate rock are mined annually from open pits.
Does apatite dissolve in water?
The solubility of apatite increased as the pH of water and the particle size of apatite crystals were decreased. The concentrations of dissolved ortho-PO4 3− increased in proportion to the amount of apatite added to water and apatite generally increased the pH of water at low slurry densities.
Why is apatite mined?
Apatite is the main source of phosphorous, an important nutrient required by plants. As such, apatite is the key ingredient in phosphate fertilizers. Most of the phosphorus used in fertilizer comes from phosphate rock, which is mined almost exclusively for this application.
What color apatite is most valuable?
Blue Brazilian apatites and those with a “neon” blue-green color, similar to that of Paraíba tourmalines, command the highest prices. Rare, rich purple specimens from Maine are also highly prized.
Does apatite glow?
Apatite, calcite, chlorophane, fluorite, lepidolite, scapolite, and some feldspars are occasionally thermoluminescent. Some minerals will emit light when mechanical energy is applied to them. These minerals glow when they are struck, crushed, scratched, or broken.
Is apatite rare or common?
While apatite is a common mineral, gem-quality apatite is quite rare. Apatite is known by gemstone connoisseurs especially for two colors; the Paraiba-like blue-green, and the leek-green color that once earned apatite the name “asparagus stone”.
Why is apatite so expensive?
“Its colour rivalled the finest quality and most valuable Paraiba tourmalines at a fraction of the price,” she says. The value of apatite depends primarily on colour saturation, so specimens with a high colour intensity command the best prices.
How do you recharge apatite?
How to recharge and cleanse Apatite. Apatite should be cleansed about once a week. The most effective method is using running water. Make sure that it’s not too hot since it’s sensitive to heat.
How do you know if apatite is real?
The common scratch test is an easy way to check many gemstones but apatite is right in the middle of the Mohs hardness scale and can be scratched by anything harder than a kitchen knife. Even a piece of glass can be harder so this does not narrow down identification by very much.
What is apatite known for?
Apatite is one of a few minerals produced and used by biological micro-environmental systems. Hydroxyapatite, also known as hydroxylapatite, is the major component of tooth enamel and bone mineral.
Is it safe to wear apatite?
Apatite is beautiful in any types of jewelry, but is not recommended for rings or bracelets for frequent use. If used in these sorts of high-exposure jewelry, apatite should be placed in protective settings. Blue apatite is the most popular variety used in jewelry, while yellow and green can also be easily found.
Can a tantalum metal form apatite without chemical treatment?
Tantalum metal will form apatite on its surface in SBF without any chemical treatment although the apatite formation does take a long time.
How long will the Earth remain habitable for humans?
The various sources and sinks are sensitive to temperature, and in the next 1.5 billion years, the global mean temperature could well exceed 80 degrees Centigrade. The evaporation of the Earth’s oceans would be well underway by 1 billion years from now.
How is the Earth’s biosphere going to change?
The bottom line is that in less time than it has taken higher life forms to evolve into land creatures, the Earth’s biosphere may be changed by the inevitable course of the evolution of our Sun.