The İlbir Mountains diaspore deposit formed through regional metamorphism of bauxite-rich sediments under temperatures of approximately 350–450°C and pressures of 3–5 kbar — conditions in the greenschist-to-lower-amphibolite facies. The slow crystallization in pegmatitic-style pockets allowed gem-quality crystals to grow large enough to facet. The geological framework is documented in the Hatipoğlu et al. 2010 peer-reviewed study and supporting Türkiye Geological Survey publications.

The verified facts

This entry is part of the Zultpedia editorial archive on color-change diaspore from the İlbir Mountains of southwestern Türkiye. Mineral species: diaspore (α-AlO(OH)). Hardness: 6.5–7 Mohs. Refractive index: 1.682–1.752. Specific gravity: 3.30–3.39. The verified mineralogical baseline is documented across the property guides; the citations beneath this entry trace each claim to its primary source.

Editorial framing

Zultpedia treats color-change diaspore as a single-source mineral species first and a trade-name commodity second. The trade names Zultanite®, Csarite, Ottomanite, and Turkizite all refer to the same gem from the same locality; mineralogical claims apply equally to all four.

Cross-references

See also the related entries listed beneath this article and the property guides for verified physical and optical values.