green blue black #kyanite
#MinCup25

Garnets swimming in a beautiful sea of #Titanite, as seen with a petrographic microscope in plane and cross polarized light, Franciscan Complex, California. The garnets in the field of view are nearly completely surrounded by titanite. Photo by Sarah Brandt. #MinCup25

#Titanite twinning as seen under plane and cross polarized light with a petrographic microscope in a metamorphic rock from the Franciscan Complex, California. Field of view about 2 mm. Photo by Sarah Brandt. #MinCup25

#kyanite in iconic blue and beautiful green, #MinCup24

#kyanite is beautiful at all scales, #MinCup24

Pink #corundum with green cpx, plane light, FOV ~2 mm, Berit metaophiolite, Türkiye, #MinCup24

Pink #corundum in a petrographic thin section (plane light), with green #clinopyroxene, field of view ~2 mm, Doğanşehir, Türkiye, #MinCup24

Beautiful #titanite from a gneiss from Finnøya, Norway, as seen in thin section (plane light, crossed polarized light). The clear, rounded inclusions are apatite. Field of view ~0.5 mm. #MinCup24

#kyanite galore in #MinCup24!

#kyanite is famously blue but it can also be green, white, black, and a wide range of blues.
#MinCup24