Rainbow fluorite is a wonderfully colourful mineral and one that we love having as part of our collection. The issue with tumbling fluorite is that it's extremely fragile so stones often end up with minor fractures. Tumbled stones are produced by filling a a barrel with rough pieces of fluorite of a similar size. Coarse grit or sand and water are then added. As the barrel slowly rotates the stones become smoother and more rounded but during this process material that's fragile like fluorite, can fracture.
Our fluorite crystals are sorted by hand after being tumbled to remove stones with any significant damage.
As well as being relatively soft (4 on Mohs scale of mineral hardness) fluorite is also brittle. It's also one of the very few stones to cleave in all four directions. In mineralogy cleavage is the tendency for a crystalline solid (one that's made up of crystals) to split along structural plains. Having this type of cleavage makes the mineral very susceptible to internal fractures. These can be caused by as little as a minor knock.
Wonderful zones of colour can be seen in many of these translucent rainbow fluorite crystals. Holding them up towards the light reveals the true magnificence of these naturally occurring solids.
Although shades of red, purple, green, blue and yellow are most commonly seen in the mineral fluorite, it can occur in almost any colour and can also be colourless which it is in its purest form.
These highly polished rainbow fluorite tumbled stones exhibit a vitreous lustre which means they reflect light in a similar way to glass.
Our rainbow fluorite tumbled stones are a medium to large sized crystal. Weights and sizes do vary slightly from piece to piece.