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-- Stone ( talk) 17:37, 28 January 2011 (UTC)
If there are native fluorine, there are native calcium too (in microscopic quantities, of course)? -- Jugydmort ( talk) 20:27, 16 April 2016 (UTC)
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-- Stone ( talk) 17:37, 28 January 2011 (UTC)
If there are native fluorine, there are native calcium too (in microscopic quantities, of course)? -- Jugydmort ( talk) 20:27, 16 April 2016 (UTC)