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If you ever get up north of San Francisco, there is a tiny beach town called Salinas. If you go to Agate Beach there is an amber colored agate called oil drop agate, it is a really nice rock to find. Each piece looks like amber with a tiny drop of oil inside it. It is actually an agate that has a small amount of CO2 in it and under pressure the CO2 gets pushed into the middle and has a dark grey color which looks black through the agate.
The blue coral is a very cool piece of coral, it is brown when alive but as it pulls calcium out of the water to make the skeleton it also pulls copper out of the sea water and that stains the coral blue. It only shows the blue color after death though, but it can be any shade from a light pale blue all the way to a dark almost navy blue.
If you live in Lancaster, do you ever go out east to the desert and find the fluorescent minerals? I try to go down there at least every other year, I lived in San Diego for 13 years before I moved to Florida, but while there I would go to the desert as often as I could.