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Feldspathoid

Haüyne

Intense royal to cobalt blue, rarely found in facetable crystals

Blue Vivid Blue
Optical properties

Optical characteristics

Ref. index
1.494 – 1.51
Luster
Vitreous
Pleochroism
None None; cubic system is isotropic.
Fluorescence
Typically strong orange-yellow fluorescence under LW UV — diagnostic.
Origins

Source localities

Italy Italy: Val Malenco / alpine localities
Major ★ Top Source

Known for demantoid and collector minerals; Monte Somma and Vesuvian area are classic haüyne localities.

45% est. supply
Worldwide Worldwide
Commercial

Broad worldwide occurrence or distribution; primary source is Laacher See, Germany (Eifel).

55% est. supply
Inclusions

Inclusions & features

Crystals Crystal Inclusions Under 10x loupe: solid, well-formed mineral crystals trapped inside the host gem. They may… Multiphase Two-Phase Inclusions Under 10x loupe: a transparent irregular cavity containing both a liquid phase and a…
Identification

Instruments used

Refractometer Measures refractive index, the backbone of gem identification 10x Loupe Your most-used instrument, start every examination here UV Lamp, Long Wave and Short Wave Fluorescence exposes treatments, synthetics, and origin Hydrostatic Scale Measures specific gravity, works even on opaque stones Spectroscope Reads characteristic absorption lines, confirms chromium, iron, copper