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Back from the gemshow in bangkok we bought the rare stone Sultanite ("Diaspore") against very good prices and furthermore 50-80% DISCOUNT on everything in Hall 2, 3 & 4 Lava outdoor images up to 70% off, all horns, shells and ocean drums also 60-70% Discount. Come quickly, very interesting! Raw stones and Madagascar products from as little as 1.50 / kilo.

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Ice or Snow Quartz tumbled stones in Medium format.

Quartz IceA_product

Ice or Snow Quartz tumbled stones in Medium format.

Product

Ice or Snow Quartz tumbled stones in Medium format.

Description

Beautiful tumbled stones from one of the best factories in South Africa. All in a large XL format so no small pebbles but really dumbbells of very good quality ..

Dimensions

(NL Medium 180-220 stuks per kilo +/- 20x20 mm) (UK Medium 180-220 Pieces per kilo +/- 20x20 mm) (DE Mittelgroß 180-220 Stück pro Kilo +/- 20x20 mm) (F moyen 180-220 pièces par kilo +/- 20x20 mm)

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More information

Quartz is a form of silicon dioxide, SiO2, and is one of the most common minerals of the earth's crust. It represents more than 12% of the volume of the crust of the earth (inter alia, in granite, sand). Quartz has two modifications: α-quartz is trigonal, β-quartz (a high-temperature form) is hexagonal. In addition, silicon dioxide is still in many other structures such as α- and β-cristobalite, keatiet, tridymite, coesite, stishovite, melangoflogiet and lechatelieriet. Although quartz is composed of silicon dioxide, it is often considered to be the tectosilicates. The reason for this is that quartz is a network of SiO4 tetrahedra. In which each oxygen atom is shared between two silicon atoms. Individual SiO2 molecules come only with gaseous silicon dioxide for. Quartz may be of high purity, such as rock crystal, but often contains impurities. These impurities can include ions, which are incorporated during growth of the crystal in the crystal lattice. Quartz crystals can contain between 13 and 15,000 ppm Al3 +, of between 9 and 1400 ppm of Na +, is between 3 and 300 ppm of K + and traces Fe3 +, Ti4 +, P5 +, H +, and Li +. The aluminum and iron in combination with ionizing radiation are responsible for the color of a quarter of a number of varieties. Further, quartz crystals grow on other minerals, such as at around Rutielkwarts is the case. Quartz crystals can form both large and form microscopic aggregates. The largest quartz crystals occur in Lost Farm in Namibia. Quartz crystals up to 20 meters, and possibly 50 meters, and up to 2 meters dolomietkristallen come here for. When quartz is melted, it forms a glass when cooled rapidly, many times, because the crystallization process takes quite a lot of time. Quartz is a piezoelectric material, and the vibrations which can induce in the lattice of the crystal are used in electronic equipment such as quartz clocks and radios. Quartz arises, among other by crystallization in cooling a molten silicaatmassa. It is therefore an important rock-forming mineral in felsic igneous rocks, such as granite. However, the main crystals are formed by the influence of water on the hot stones. This quartz dissolves into the surrounding rock in the form of ortho silicic acid, and stores it down in voids and cracks during cooling of the solution. Also in geodes can quartz crystallize by leaching of the surrounding rock. Quartz is chemically quite inert and dissolves poorly in water under atmospheric conditions. The solubility in water at 25 ° C is between 6 and 11 mg / l. This means that hardly dissolves at weathering of quartz-containing rocks quartz. As a result, the most common form of quartz sand and sandstone.

 

STRONG TRADEMARKS TIMMERSGEMS GROUP