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It is all the more special to find your own crystals and minerals. I used to regularly find Calcite clusters and large points in South Wales, the biggest was perhaps 30kgs, also Clear quartz, Gypsum crystals and others. I've found natural Smoky Quartz (var Cairngorm) up here in Scotland - really lovely pieces which are the real thing because I know where I found them - (unlike the masses of 'irradiated Quartz' sold as Smoky Quartz in many crystal retailers).
There are a lot of minerals that are 'changed' by man with different processes; radiation, heat treatment and chemical treatment to make them a more saleable product. Virtually every crystal shop has these for sale but their clientele will often never realise it. Citrine for instance - the greater majority is simply heat treated, poor grade Amethyst..
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