£1.20 – £2.10
Chalcedony mineral specimens from Morocco, the pieces belong to the quartz family of minerals and is very similar to carnelian, even having a waxy lustre, although it tends to have a botryoidal crystal habit. The pieces are white, grey and black and available in various sizes, supplied in a card tray with an information label.
Chalcedony is a cryptocrystalline form of silica, comprised of the polymorphs quartz and moganite. Typically, chalcedony has a waxy lustre and a botryoidal (bubbly) appearance, commonly it is blue in colour, but reds, oranges and white are also present, sometimes mixed together. Chalcedony, along with carnelian has been used throughout history as a gemstone, its pearly lustre when polished has seen it used in various pendants, seals and broaches. It was also used much earlier than that as pre-historic tools and implements such as spear and arrow heads due to the conchoidal fracture that chalcedony has, like other quartz minerals, it tends to break similar to glass. Such examples of primitive chalcedony tools have been found as far back as the Bronze age. These particular specimens of chalcedony are in the form of small nodules with an extremely botryoidal form and come from Morocco, they are mostly opaque and white,black and grey in colour but interestingly also flourese to a luminous brown colour when exposed to shortwave UV lighting. Available in a range of sizes each supplied in a labelled card tray.