Referenz
Eigenschaften von Zultanit – geprüfte Mineralogie
-
Eigenschaftsleitfaden
Spaltbarkeit von Zultanit — Vollkommen auf {010}
Zultanite (gem-quality color-change diaspore) has perfect cleavage on the {010} crystallographic plane. This is the dominant durability constraint for the gem: a sharp impact aligned with that plane can cleave the stone…
-
Eigenschaftsleitfaden
Zähigkeit von Zultanit — Warum Härte allein täuscht
Zultanite's 6.5–7 Mohs hardness measures scratch resistance, not toughness. Toughness — resistance to chipping and cleaving under impact — is rated only "fair" for diaspore because of its perfect {010} cleavage. A…
-
Eigenschaftsleitfaden
Kristallhabitus von Diaspor — Tafelig, azikular, massig
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…
-
Eigenschaftsleitfaden
Optischer Charakter von Zultanit — Zweiachsig positiv
Zultanite is biaxial positive: light traveling through the crystal splits into two rays with three principal refractive indices (nα 1.682–1.706, nβ 1.705–1.725, nγ 1.730–1.752), with nβ closer to nα than to nγ.…
-
Eigenschaftsleitfaden
Härte von Zultanit — 6,5 bis 7 auf der Mohs-Skala
Zultanite (gem-quality color-change diaspore) measures 6.5 to 7 on the Mohs hardness scale, comparable to peridot and below quartz. This places it in the moderately hard range — durable enough for pendants,…
-
Eigenschaftsleitfaden
Brechungsindex von Zultanit — 1,682 bis 1,752
Zultanite (gem-quality color-change diaspore) has a refractive index range of 1.682 to 1.752 with strong birefringence (~0.048). It is a biaxial positive gem with three distinct refractive indices: nα 1.682–1.706, nβ 1.705–1.725,…
-
Eigenschaftsleitfaden
Dichte von Zultanit — 3,30 bis 3,39
Zultanite (gem-quality color-change diaspore) has a specific gravity of approximately 3.30 to 3.39, depending on trace-element content. It is heavier than quartz (2.65) and tourmaline (3.06), comparable to topaz (3.49–3.57), and lighter…
-
Eigenschaftsleitfaden
Farbwechsel von Zultanit — Drei Lichtquellen, ein Kristall
Zultanite shifts visible color across three illuminants: sage-green under cool daylight (6500 K), champagne-gold under indoor incandescent or fluorescent light (~3000 K), and raspberry-pink under candlelight (~1850 K). The shift is caused…
-
Eigenschaftsleitfaden
Pleochroismus von Zultanit — Drei kristallografische Farben
Zultanite shows strong trichroic pleochroism: it displays three different colors when viewed along its three principal crystallographic axes. Typical pleochroic colors are kiwi-green, dark green-brown, and pinkish-orange. This is independent of the…
