Strontianite (SrCO3) is a mineral consisting of strontium carbonate. This mineral is white, greenish, or yellowish in color,
usually occurring in fibrous massive forms, but sometimes in prismatic[?]crystals.
... gyro tops will not simply fall over, but start precessing around. (The precessing motion is perpendicular to the torque trying to make the gyro fall over.)
The ...