I came across various sites that discuss the mineral known as lorandite (TlAsS2). One, a more 'popular science' one is firstname.lastname@example.org/Europe/2781.cfm . There's a paper too, but I can't get it since it's not freely available (email@example.com/science?_ob=ArticleURL&_udi=B6TJM-473DD45-FJ&_user=10&_rdoc=1&_fmt=&_orig=search&_sort=d&view=c&_acct=C000050221&_version=1&_urlVersion=0&_userid=10&md5=0c9c11a59c9706071b4a8c5988be1dc8 ). So, can some one explain how can this mineral detect the solar neutrino flux and if it can, why isn't it widely used as a detector? ( replace the @s with dots in the links, the forum tells me that I need to have more than 15 posts in order to post links ) PS. I hope this it the right forum for this kind of questions, please move it if I'm wrong.