Tantora White Mineral Stone Montmorillonite Rock 100g Crystal Red Bee Shrimp CRS 100% Natural. Tantora White Mineral Stone is a clay mineral composite of Montmorillonite. This clay is derived from geologic tectonic plate activity, volcanic action and river hydrolysis. Montmorillonite silicate has attracted and attached potent mineral nutrients from mountain soils and streams. The nutrients in White Mineral Stone have properties to absorb toxins and improve water clarity. White Mineral Stone once dissolved into water provides trace minerals necessary for coloration and health of ornamental shrimps. NOTES: The display color of the item and its packaging could differ from the actual product due to uses' monitors settings.