Iron Sulfide·Isometric System·Cubo‑Pyritohedron
Pyrite,
the Habit Plate
FeS2 · H 6–6.5 · SG 5.01
Brass-yellow metallic crystals, striated and twinned, catalogued on slate matrix. Luster, not flat colour — every facet implies reflection and faint tarnish iridescence.
{100} cube
{210} pyritohedron
striae ∥ a
iron-cross twin
FIG. 7
cubo-pyritohedron, intergrown