ANSWER REVEALED IN COMMENTS BELOW
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MATERIAL: I am an igneous rock composed primarily of feldspar minerals.
DESCRIPTION: I am dark gray to black with flashes of silver or blue that catch the light in certain angles. I have a Mohs hardness around 6 and a smooth, polished appearance is where I really shine.
FORMATION: I form deep within the Earth as magma slowly cools, allowing large mineral crystals to develop.
METAPHYSICAL USES: I am said to support grounding, enhance intuition, and help filter out unwanted energies while keeping you mentally clear and focused.