What is it? This rock looks
like a plain-old piece of basalt (solidified lava). Like other
basalts in this series (16, 17,
18), it's got vesicles
(gas bubbles). The weathered surface is reddish (Fe3+),
but the interior is gray (Fe2+), which is common in basalts.
Someone dug this rock out of the ground in Florida. There are
no volcanoes in Florida, so this rock almost certainly got to Florida
with the help of humans. Basalt rocks like this are common in
landscaping.
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