They're both crystallized aluminum oxide (Al2O3) called corundum. Ruby's color comes from chromium impurities and sapphire's color comes from iron contaminants.
The fingerprint scanner on the Apple devices are coated with sapphire (technically correct I suppose) but a more correct term would be just corundum because they're colorless.
They are the same. They're just contaminated with different things. It's like the difference between pure water, salt water, and sugar water. They're all water, but one's pure and the other two are contaminated.
Their base is. It's not like ethanol and methanol. They're both alcohols and they look identical, but they have entirely different chemical compositions. You can't take out a contaminate and say they're both the same; they're fundamentally different. With sugar and salt water, you can take out the contaminant and say the remainder is the same because it is. Same with ruby and sapphire. They're chemically the same thing. Iron and chromium aren't chemically bound to the corundum, it's just "dissolved" in there like sugar and salt.
Judging by the chain, it would probably take 30 seconds. And not everyone likes song chains, even less like to be continually be brought back by people taking over a post to type a song that had no real relevance to the post. I didn't do it but I can totally see why someone wouldn't want to see it upvoted =D
The fingerprint scanner on the Apple devices are coated with sapphire (technically correct I suppose) but a more correct term would be just corundum because they're colorless.
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And every part of me is saying "Go get 'er."