Best Pleochroic
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Indicolite is the blue to blue-green color variety of elbaite, a species in the tourmaline mineral group. Its color is associated with trace elements in the crystal structure, and individual stones may show pleochroism, displaying different shades when viewed from different directions. Transparent m...
Andalusite is an aluminum nesosilicate mineral named after Andalusia, Spain, known for its distinct pleochroism and chiastolite cross-shaped variations.
Manganese-rich variety of epidote producing red to violet coloring; first described from Piedmont (Piemonte), Italy, which gives the mineral its name.
Kunzite is a pink to lilac variety of the mineral spodumene, discovered near Pala, California in 1902 and subsequently named after the renowned American gemologist George F. Kunz.
Iolite is a silicate mineral also known as cordierite, famously utilized by Viking navigators as a polarizing lens, or sunstone, to determine the sun's position on overcast days.
A calcium iron borosilicate mineral of the axinite group, distinguished by clove-brown color and sharp wedge-shaped crystals, occurring in contact metamorphic zones.
