RUBY KYANITE FLUORESCENT 21
A chunky Ruby Kyanite Fluorescent 21 Palmstone. One of my favourite mineral combinations and an unusual natural mix of blue and red. This stone is popular among crystal collectors and will make an uncommon addition to the stone collection. An awesome polished crystal that comes in a charming drawstring pouch. A great gift or treat. One pic is taken with Longwave UVA light to show the Fluorescent Ruby.
Ruby’s are Red and all other Corundum are Sapphires. The name is from Sanskrit “kuruvinda” meaning Ruby. A rare sapphire is a Padparadscha which is a pinky peach colour, found in Sri Lanka. Ruby is the second hardest natural mineral. The Element Chromium is what causes the Red colour in Ruby. The best shade of red for a Ruby is Pigeon Blood Red. Ruby can be any shade of red up to almost pink. They are the most amazing Gemstone and in my mind way better than Blood Diamonds.
Corundum is a crystalline form of aluminium oxide, containing traces of iron, titanium, vanadium and chromium. This makes gem quality corundum rare. The crystal shape of Corundum is hexagonal but they don’t always come in that form. Ruby has a hardness of 9 on the Mohs scale.
Kyanite: Al2 SiO5.
The mineral Kyanite is a polymorph with two minerals, Andalusite and Sillimanite. It has a unique characteristic in that it has a wide variation in hardness. When scratched parallel to the long axis of the crystal, the hardness of Kyanite is 4.5. When scratched perpendicular to the axis it is approximately 6.5.