Can You Tell What Is In A Geode Before Opening It?

Can you tell what type of crystal or color will be inside of a geode before opening it? Unfortunately not! You will not be able to tell what crystals are inside of a geode until it's opened. You can make an educated guess based on locality and some context clues. For instance if I see a Las Trancas geode I can pretty well expect blue chalcedony and quartz of various varieties HOWEVER I have cracked exactly two pink quartz geodes from there. So...

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