Amethyst on Calcite (reverse scepters) Wavellite and it’s because of twins

and it’s because of twins like this

"sword"-shaped crystals of Vivianite on metamorphosed Sandstone matrix

white/colorless Quartz crystals aesthetically flaring out of the sides

jet-black twinned crystal of Ferberite (twinned along the a{100} face)

Amethyst on Calcite (reverse scepters) Wavellite and it’s because of twinsThis specimen is an attractive display piece consisting of fine quality, sharp, gemmy, lustrous, prismatic, purple "reverse" scepter and simple prisms of Amethyst associated with good quality, gemmy, white colorless, modified scalenohedra of Calcite sitting on underlain "chlorite" on matrix. This piece is remarkable for Bolivia as it features a type of crystallization that is virtually unheard of for this country. A great piece for the quality and