Specializing in high-quality gemstones, NexEase International offers a variety of precious and semi-precious stones like diamonds, rubies, sapphires, and emeralds. Sourced from trusted global suppliers, our gemstones ensure authenticity and exceptional craftsmanship. Perfect for the jewelry business or collectors, we provide a reliable supply of stunning gemstones tailored to your needs.
Kyanite is a typically blue silicate mineral, commonly found in aluminium rich metamorphic or sedimentary Rocks.Kyanite is a member of the alumino-silicate series, which includes the polymorphs, alusite and sillimanite, which have the same chemical composition (Al2O3.SiO2) as alusite and sillimanite but it is distinguished from those two minerals by its physical properties. Refractory Materials : Refractories are heat-resistant materials that constitute the linings for high-temperature furnaces and reactors and must be able to withstand high temperatures, mechanical wear, thermal shock and chemical corrosion. Kyanite is used in refractories sometimes in raw form and mostly in calcined form. 1. Raw kyanite: Kyanite has high expansion coefficient. Moreover, its calcination into mullite is also accompanied by a significant expansion in volume (20%). Raw kyanite as a refractory material is thus particularly beneficial when shrinkage from other materials and binders needs to be compensated for. 2. Calcined kyanite: Kyanite calcined to mullite is widely utilized in refractory products. Mullite exhibits excellent refractory properties like thermal stability (it is stable upto 1810 C), thermal shock resistance, creep resistance, and high hot strength and chemical corrosion resistance. Refractory bricks made from calcined kyanite possess outstanding: Higher modulus of rupture. Lower co-efficient of expansion. Increased firing range and temperature. Increased durability, about three times that of ordinary bricks. More resistance to salt attacks. Very low co-efficient of spalling. Kyanite refractories find application used in glass industry as well as various metallurigical industries (except steel metallurgy, as mullite refractory bricks are corroded by iron slag and are not highly resistant to metallic oxides). Kyanite has been a supplier of raw kyanite for many years. Our kyanite is high in purity, free from iron oxide, silica, bases and alkalis. These impurities considerably reduce the softening point of mullite and thus affect the refractory properties. kyanite is often associated with the mineral corundum. This is advantageous as it reduces the percentage of free silica when calcined. All in all. Specfications : Al203:- 35-52% Fe2o3:- 1-5%
1mm rare size almandine crystals . Location afghanistan Quantity: 7kg 7kg.1mm size
Gemstone
Amethyst recently mined and fresh from the soilâ?¦ ready to export.. item located outskirts Zambia.. Product can be shipped worldwide
Low grade aquamarine recently mined and ready to be exported..
Natural Alexandrite Gemstone
These sre natural precious and semiprecious gems stones from Sri lanka. All are natural stones . We can supply according to buyers requirement. There are individual precious gemstones available with certificate from Sri Lankan Gem Authority. Eg Blue sapphires, rubies, yellow sapphires, and Alexandrite. Semi precious stones lots available for jewellery manufactures. Customer should give their specification as they required. Expensive stones like rubies , sapphires are marketing according to carat weight, colour and grading of the stone with a certificate. Any customer like to see the stone with his own eys, we can arrange the visit to Sri lanka and bye it from the original supplier. Payment methods are bank transfer with LC. Shipping port is Sri Lanka Colombo.
lepidolite rough stone available in large quantities
