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| Flint, Quartz, Igneous |
This rock does not have the outward look of a geode. This opening in it does, however; look like the inside of a geode. It has crystals. Wikipedia says that geodes can form either by volcanic activity, crystals form as the liquid cools. or sedimentary filling of openings in the rock, not hot, by liquids which crystallize as the water evaporates.
Wikipedia. says, "Flint is a hard,
sedimentary cryptocrystalline form of the
mineral quartz." No wonder I thought the white may be quartz, it is! Wikipedia also says, "The exact mode of formation of flint is not yet clear but it is thought
that it occurs as a result of chemical changes in compressed sedimentary
rock formations, during the process of
diagenesis." It is sedimentary rock, not metamorphic, because diagenesis connotes heats not great enough for metamorphosis to occur. I should have named this "sedimentary"
not "igneous."
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| Flint, Quartz, Igneous |
I tossed this rock into the the tumbler several years ago. I had not seen the aspect of the geode in it. I removed it from the the "load" when I changed grit and had a better look. I think I can see detritus from the tumbler in among the crystals. I might try to blow it out or wash it out.
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| Flint, Quartz, Igneous |
Did you know that crystals such as these, not these, are diamonds and they come out of the ground. I think these are quartz crystals. How interesting!
I have tried to say what I know to be true about this rock. I am open to corrections.
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