Amethyst Quartz
Vitreous violet habit, cabinet lamp
trigonal · SiO₂
Specimen tray under hard lamp
Luster Has Geometry
Faceted minerals rise from a warm black ground while fine axial notations make each saturated color read as evidence.
α=β=γ
a:b:c
2/m
Azurite
Prismatic copper blue
2/m
Malachite
Green banded copper ore
mono.