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<p><b>New page</b></p><div>===Feldspar===<br />
There are many varieties of feldspar, and therefore, many different ways in which it interacts with light. Some feldspars (such as spectrolite) appear to have an iridescent sheen because the light is reflected from below the surface of the stone (this is the same effect discussed above under ''oil''.</div>FuzzyBot