At the precise moment I write this, there is information about 108,230,950 organic and inorganic chemical substances from the World's disclosed chemistry. So it was with a sense of curiosity that I came across this article in the American Mineralogist[cite]/10.2138/am-2015-5417[/cite] entitled "Earth’s “missing” minerals" (the first in a series of articles apparently planned on the topic of the missing ones). The abstract is particularly interesting and whilst I encourage you to go read the article itself, I will quote some eye-catching observations from just this abstract: