Clear Opal (Hyalite) specimen. 6 gms (0.21 oz)

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This is the item you will receive. The image(s) above will usually appear larger than the actual item, please check size and weight details in the listing. Images are taken under artificial light, colour may vary when viewed on different monitors and under different light conditions. Opal SiO 2 · nH 2O Australia Some minor rainbow flashes. Opal is classed as a mineraloid rather than a mineral. It is an amorphous form of silica chemically similar to Quartz but with a relatively high amount of water present (up to 21%). Precious (or Gem) Opal is composed of spheres of silica packed in such a way that they set up refractions which cause the rainbow like flashes. Most Opal is 'common' rather than 'precious', common opal does not display the rainbow flashes and comes in numerous colours, typically white, grey and green. 25mm x 15mm x 12mm, 6gms (0.98in x 0.59in x 0.47in, 0.21oz) All sizes and weights are approximate. Item no: 2784 Postage for this item: UK 2nd ClassUK 1st Class European Union Airmail USA, Canada, Australia,New Zealand & JapanAirmail £1.20 £1.40 £3.30 £3.80 Postage to other destinations by prior agreement only - please contact seller before bidding New arrangements for combined shipping, please read below for details. 1. It is now necessary to use the 'Add to basket' facility (where available) to combine items.Once read more