Haϋyne Value, Price, and Jewelry Information

Rob Lavinsky, iRocks.com – CC-BY-SA-3.0 [CC-BY-SA-3.0], via Wikimedia Commons

Haüyne

Haϋyne is one of the major constituents of lapis lazuli, a well-known and ancient gem material. It is, however, rarely seen as a distinct gem species. It is cut for collectors mainly as a curiosity, but faceted gems that are deep blue in color are extremely beautiful. Blue is the most sought after color in this material.

Haüyne Information

Data Value
Name Haüyne
Varieties Lazurite, Lapis Lazuli
Colors Blue; also white, shades of gray, green, yellow, and red.
Crystallography Isometric. Crystals dodecahedral or octahedral; usually rounded grains.
Refractive Index 1.496-1.505
Luster Vitreous to greasy.
Hardness 5.5 - 6
Fracture Conchoidal to uneven
Specific Gravity 2.40-2.50. (Eifel = 2.40.)
Birefringence None.
Cleavage Distinct 1 direction
Stone Sizes Opaque material is cut into cabochons up to an inch or two, but faceted gems are exceedingly rare and always small (under 1-2 carats), chiefly from the Eifel region of West Germany.
Luminescence Usually none; sometimes orange-red in LW (Germany).
Luminescence Present Yes
Luminescence Type Fluorescent, UV-Long
Transparency Translucent to semitransparent.
Absorption Spectrum Not diagnostic.
Formula

(Na,Ca)4-8(AI6Si6)O24(SO4S )1 -2.

Optics

= 1.496-1.505. (Eiffel = 1.502).

Sodalite Group: See Lazurite.

Streak: Slightly bluish to colorless.

Optics:  N= 1.496-1.505. (Eiffel = 1.502)

Occurrence: Alkaline igneous rocks, associated with leucite and nepheline.

Montana; South Dakota; Colorado.

Quebec, Canada; France; Laacher See, Germany; Italy; Morocco.

Comments: Haϋyne is one of the major constituents of lapis lazuli, a well-known and ancient gem material. It is, however, rarely seen as a distinct gem species. It is cut for collectors mainly as a curiosity, but faceted gems that are deep blue in color are extremely beautiful. Blue is the most sought after color in this material.

Name: After René Just Haϋy, one of the great early mineralogists.