Prehnit<\/a>\u00a0ist ein blassgr\u00fcnes bis gelbgr\u00fcnes Mineral, das h\u00e4ufig in runden, kugelf\u00f6rmigen Aggregaten oder als Krustenablagerungen auftritt. Es hat einen glasigen bis perligen Glanz und ist teilweise durchscheinend. Die Farbe wird gew\u00f6hnlich durch Spuren von Eisen verursacht. Prehnit wird manchmal als Edelstein verwendet und ist bei Sammlern wegen seines unverwechselbaren Aussehens beliebt.<\/p>\n Das Mineral wurde erstmals in S\u00fcdafrika entdeckt und ist nach dem niederl\u00e4ndischen Oberst Hendrik von Prehn benannt. Gr\u00f6\u00dfere Vorkommen gibt es in S\u00fcdafrika, Australien, Schottland, den Vereinigten Staaten und China. Prehnit bildet sich in der Regel in Hohlr\u00e4umen von Vulkangestein und ist ein Produkt hydrothermaler Prozesse. Seine chemische Formel lautet Ca\u2082Al(AlSi\u2083O\u2081\u2080)(OH)\u2082 und seine H\u00e4rte liegt zwischen 6 und 6,5 auf der Mohs-Skala.<\/p>\n Quellen:<\/strong> Prehniet Prehniet\u00a0is een lichtgroen tot geelgroen mineraal dat vaak voorkomt in afgeronde, bolvormige aggregaten of als korstige afzettingen. Het heeft een glasachtige tot parelmoerachtige glans en is deels doorschijnend. De kleur wordt meestal veroorzaakt door sporen van ijzer. Prehniet wordt soms gebruikt als edelsteen en is populair onder verzamelaars vanwege zijn kenmerkende uiterlijk. 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\nMindat.org<\/a>,\u00a0Gemdat.org<\/a>,\u00a0Wikipedia \u2013 Prehnit<\/a><\/small><\/p>","protected":false},"excerpt":{"rendered":"