Ruby or garnet?

[firehorse12]

Found in Texas river bed. Any ideas?

 

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[surf]

Hey firehouse,

I don't think it's either of those, but believe that light source and type has a lot to do with the appearance of rocks.

 

[firehorse12]

Hey firehouse,

I don't think it's either of those, but believe that light source and type has a lot to do with the appearance of rocks.

I used a flash in some and tried to get close ups. Do you have an idea what it is?

 

[bigfoot1]

I believe they are volcanic in nature,like obsidian.whatever minerals that are in the area of heat and pressure can"*******ize"the parent rock causing limitless combinations.the smoother the slower it cooled on surface.Too much crystalline structure for a gemstone.I'm no geoligist,but I have seen examples,"in the wild"just like those.
pat.....p.s.most universities are happy to id for you.if they like,they may make an offer.