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New this week; Sage from USA, saltlamps from Pakistan and dreamcatchers from Indonesia. Very slowly, countries will open again, Morocco will open, and we expect a 40 foot container with Selenite, minerals and fossils next week. 

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SALE 2020: Silicon carbide Uzbekistan (2-4kgs) in a beautiful crystal group on foot.

SALE 2020: Silicon carbide Uzbekistan (2-4kgs) in a beautiful crystal group on foot.


SALE 2020: Silicon carbide Uzbekistan (2-4kgs) in a beautiful crystal group on foot.


Beautiful iridescent crystal groups on wooden base (pieces of 0.4 to 1.5 kg) against sharp price per kilo.

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More information

Silicon carbide (SiC), also known as carborundum, is a very hard material that is widely used for grinding and polishing, in the form of grinding wheels, polishing and grinding powders and as a coating of sandpaper, and nowadays also for the armouring of armored vehicles. The compound was discovered by Edward Goodrich Acheson that a patent obtained on February 28, 1893. Granular silicon carbide is produced on a commercial scale by a reaction at very high temperature. High-quality silica sand and carbon (mostly petroleum coke) are previously mixed in the right proportion to reaction material. This mixture is a lot of material built. Midst of this heap material is a core of graphite serving as a conductor. The graphite core is connected to a transformer and put under tension. As a result of the resistance runs into the core of the material heap (oven) The temperature increased to approximately 2700 degrees Celsius. At this temperature the reaction is SiO2 (sand) + 3C (coke) provides SiC + 2 CO (carbon monoxide); In short: SiO2 + 3 C → SiC + 2 CO A clear distinction must be made between granular silicon carbide and silicon carbide fiber-like, which is produced at the nano scale for specific purposes. It has been demonstrated is that granular silicon carbide is toxic inert. Granular silicon carbide, as produced in the Netherlands is not as dangerous substance or preparation classified according to EC Directive 67/548 / EEC or Directive 1999/45 / EC or Regulation (EC) no. 1272/2008. In a December 7, 2012 published report, the Dutch Health Council that silicon carbide in fiber form (fiber, "whiskers") can cause cancer and should be classified as "carcinogenic to humans" (category 1A), according to the Health classification. The data on the granular form of silicon carbide are not sufficient to be able to classify the carcinogenic properties of these (class 3). Reason is that the committee is concerned about whether the commercial granular silicon carbide is sufficiently free of fiber-shaped silliciumcarbide