Weloganite Value, Price, and Jewelry Information

Weloganite: Francon Quarry, Quebec Canada (0.37). Photo © Joel E. Arem, PhD, FGA. Used with permission.

An overview on Weloganite Jewelry and Gemstones. Covers details and essential information on the physical properties and characteristics of Weloganite gems.

Weloganite Value

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Weloganite Information

Crystallography Hexagonal; crystals hexagonal, barrel shaped with heavy striations on prism faces, also grooved due to oscillatory growth. Crystals distinctive, terminated by pedion or pyramids. Also massive.
Refractive Index 1.558-1.648
Colors White, lemon yellow, amber. Crystals may be zoned.
Luster Vitreous.
Fracture Conchoidal
Hardness 3.5
Specific Gravity 3.20
Birefringence 0.090
Cleavage Perfect
Stone SizesClean, yellowish stones (mostly under ½ carat) have been faceted from this material. National Museums of Canada (Ottawa, Ontario): 4.27 (light greyish-yellow); 0.52 (light yellow).
Luminescence None reported.
Transparency Translucent.
Absorption Spectrum Not diagnostic.
Pleochroism None.
Optics a = 1.558; β = 1.646; γ = 1.648. Uniaxial (-).

Optics: a= 1.558; β= 1.646; γ=1.648.

Uniaxial (-)

Occurrence: In an alkalic sill intruding a limestone at St. Michel, Montreal Island, Quebec, Canada.

Name: For William E. Logan, first director of the Geological Survey of Canada.