Large Blue Kyanite 520g 1lb 2.3ozg From Minas Gerais Brazil Specimen, Crystals Crystals__minerals it is simply the coating

it is simply the coating or replacing of the shell by the opal

Beautiful Aragnoite/ Cave Calcite From Minas Potosi Chihuahua

while other varieties include anandite

vein fillings or crusts

Large Blue Kyanite 520g 1lb 2.3ozg From Minas Gerais Brazil Specimen, Crystals Crystals__minerals it is simply the coatingBeautiful Blue kyanite specimen from Brazil. Beautiful shades of blue and white make up this lovely specimen with nice fanning out. 520g 1lb 2. 3oz Mostly blue on one side other side has more mica and quartz. Gem Lore and Info: Kyanite is an aluminum silicate mineral, often occurring as long, striated bladed crystals that may be transparent or translucent with a pearly sheen. The most common colors in metaphysical use are blue streaked with white,