Diaspore commonly forms thin platy or tabular crystals flattened on {010}, occasionally elongated needle-like (acicular) crystals along the c-axis, and frequently as fine-grained massive aggregates within bauxite ore. Gem-quality crystals from the İlbir Mountains are exceptional in being large enough (occasionally >10 cm), transparent enough, and structurally sound enough to facet — habits unknown from any other documented locality.

The measurement

Visual identification of crystal morphology is the standard method documented in laboratory reference texts. Diaspore-specific values are documented across the property guides; this entry focuses on the practical implications.

Implications for buyers and graders

The value above is part of the verified mineralogical baseline editors apply when grading or authenticating a stone. Discrepancies from this baseline are documented case-by-case in laboratory reports and should be flagged before transaction.

Where this fits in the larger archive

See the related property guides for adjacent measurements and the cluster-support articles for practical applications.