Assertion: mica's form | /r/HasProperty | crystalline
Facets:
Source sentences:
text: Silicon dioxide has two naturally occurring forms: crystalline and amorphous.
text: Electron microscope scans of human brain-tissue samples are able to differentiate between magnetite produced by the body's own cells and magnetite absorbed from airborne pollution, the natural forms being jagged and crystalline, while magnetite pollution occurs as rounded nanoparticles.