Cross Section Photography of Smoothly Polished Agate Minerals
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Cross Section Photography of Smoothly Polished Agate Minerals

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Pink prismatic terminated calcite crystals ~ [Location not specified] (Unknown Year) — Mineral specimen showcasing natural crystalline structure.
Crazy lace Agate under the microscope!
Rutile
Rutile is an oxide mineral composed of titanium dioxide (TiO2). Its crystal system is of tetragonal type.

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"Gneissoid contorted schist." Rocks and Rock Minerals. 1908.
Internet Archive
By Wallace Chan - [•]
let's make a feldspar :D
Sodium (Na)
Calcium (Ca)
Potassium (K)
depending how much sodium, potassium, and/or calcium is available, you can get different feldspars! labradorite is my favorite.
remember: stay OUT of the miscibility gap.
there are NO FELDSPARS in the gap. you can't fit that much calcium and potassium in one feldspar. it's not done.