As far as is known, only one report of crystal twinning
in datolite is found in the literature.
The [Beta] type orientation is associated with crystal twinning
at the (110) plane such that the plane normal of (130) orients in the thickness direction, while that of (110) orients at some degree away from the thickness direction.
the "spiral staircase" aggregation of Si[O.sub.4] tetrahedra in quartz), the formation of pseudomorphs, crystal twinning
and laws thereof, and even (you guessed it) snowflakes, also known as ice crystals.