IPA: /ˌɒk.təˈhɛd.rə.li/
KK: /ɑkˈteɪhɛdrəli/
In a way that relates to or resembles an octahedron, which is a solid shape with eight faces.
The crystals formed octahedrally, creating a unique geometric pattern.
Octahedrally → It is formed from "octa-" (from Greek "okta", meaning eight) and "hedron" (from Greek "hedra", meaning face or base). The word describes a geometric shape that has eight faces, hence the term octahedrally refers to something related to or resembling an octahedron.
Think of 'eight' ('octa-') faces ('hedron') when you picture something that is octahedrally shaped.