Floating-Zone Process
Hattori Seiko (red, orange, blue), Novosibirsk (red).
1. Gas bubbles of various
sizes, shapes and orientations.
2.
Irregular colour swirls.
3.
Secondary lamellar glide twinning along the rhombohedron faces. Twin planes
may intersect at 87 and 93 , and may also show long white needles (boehmite?) at the junctions
of intersecting twinning planes. Best seen between
crossed polars while immersed.
4.
Rectilinear parting.
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