Replies

There is mostly synthetic corundum in industrial use and ruby lasers can only use synthetic rubies. However, natural formation are fascinating.

1 posted on 09/19/2014 7:39:28 PM PDT by JimSEA

To: JimSEA

And who doesn't love the Lake Superior agates.

2 posted on 09/19/2014 7:45:30 PM PDT by cripplecreek ("Moderates" are lying manipulative bottom feeding scum.)

To: JimSEA

6 posted on 09/19/2014 7:52:43 PM PDT by HangnJudge

To: JimSEA

If Corundum is over 50% red it is Ruby... all other color are Sapphire. Fine Ruby is my favorite gem.

7 posted on 09/19/2014 7:53:20 PM PDT by DocRock (All they that TAKE the sword shall perish with the sword. Matthew 26:52 Gun grabbers beware.)

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