ANSWER REVEALED BELOW IN COMMENTS
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MATERIAL: I am a feldspar mineral, but I’m often mislabeled as something I’m technically not. I often grow with Black Tourmaline.
DESCRIPTION: I appear white to translucent, but I display flashes of blue and sometimes full-spectrum color that move across my surface when light hits me. My hardness is around 6–6.5.
FORMATION: I form in igneous environments, where slow cooling allows internal layers to develop and create my light-reflecting effect.
METAPHYSICAL USES: I am said to enhance intuition and inner awareness while also offering a subtle layer of energetic protection and grounding.