[5][6] In a thin section it has a high surface relief and will have sharp boundaries with the surrounding medium.

Sampleite is anisotropic and has visible pleochroism and birefringence.

When it occurs as micaceous rosettes and aggregates it can be associated with dendrites of manganese and iron oxides.

Sampleite appears to be the most recent mineral deposited with the exception of gypsum.

[7][8] Media related to Sampleite at Wikimedia Commons