Stibnite is a distinctive steely grey coloured mineral with a metallic lustre. It's an ore of antimony which forms long and slender prismatic crystals which usually point in different directions. Antimony is a chemical element and one of its uses is to create the blue colour in fireworks.
The mineral calcite is often associated with stibnite and can clearly be seen on many of these needle-like crystals. This piece sparkles incessantly as it catches the light at almost every angle and there's an overwhelming temptation to keep wanting to touch it but this mineral must be handled as little as possible because it is exceptionally fragile. Stibnite is graded just 2 on Mohs scale of mineral hardness so to put that into perspective, it's only very slightly harder than the clay mineral known as talc which is used to create talcum powder.
Weight (grams): 63.4
Size (cms): 7.5 x 5.6