Weloganite Value, Price, and Jewelry Information

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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 Information

Data Value
Name Weloganite
Stone Sizes Clean, 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).
Formula Sr5Zr2C9H8O31
Colors White, lemon yellow, amber. Crystals may be zoned.
Fracture Conchoidal
Hardness 3.5
Cleavage Perfect
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
Birefringence 0.090
Luminescence None reported.
Luminescence Present No
Absorption Spectrum Not diagnostic.
Pleochroism None.
Optics a = 1.558; β = 1.646; γ = 1.648. Uniaxial (-).
Optic Sign Uniaxial -
Luster Vitreous.
Specific Gravity 3.20
Transparency Translucent.

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.

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