CaSO4 2H2O- Selenite (Satin Spar) Calcium sulfate dihydrate
Fibrous white monoclinic crystalline, rectangular prism
A form of gypsum mineral, which form columnar crystals that are often transparent or milky.
Satin Spar- Selenite
Cool to the touch and smooth with defined grains, the name Satin Spar seems appropriate. It feels similar to a polish glass, but up close it has a very intricate and miniscule structure.
Like the Calcite, it absorbs light and becomes illuminated even in dim light. The sheen that light brings from it has two directions, along the strands of fiber-like crystal and against its grain in bands of dense illumination.
This crystal has such defined direction, and reminds me of fossilized tree trunks like the ones in the Petrified Forest of Arizona. Many other stones follow this formation, and its edge is so structurally precise it would work as a ruler.
