O - Glossary

O ray

Obsidian

Obtuse bisectrix

Obtuse bisectrix figure (Bxo)

Octahedral (cleavage)

Octahedral (coordination)

Octahedron

Ocular

Olivine

Opalescence

Opaque

Open form

Operation (symmetry)

Operator (symmetry)

Optic axis

Optic axis (OA) figure

Optic normal

Optic normal figure (ON)

Optic plane

Optic sign

Orbital (atomic)

Order of diffraction

Ordinary ray (O ray)

Ore

Ore deposit

Ore grade

Ore mineral

Organic

Orthogonal

Orthonet

Orthopyroxene

Orthorhombic

Orthorhombic (system)

Orthoscopic illumination

Orthosilicates

Ostwald ripening

Out-of-phase

Oxidation

Oxide

Oxidize

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