Weloganite Value, Price, and Jewelry Information

view gemstone encyclopedia

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
Formula Na2Sr3Zr(CO3)6 · 3H2O
Colors White, lemon yellow, amber, colorless. Crystals may be zoned.
Fracture Conchoidal
Hardness 3.5
Cleavage Perfect
Crystallography Triclinic; crystals pseudo-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 May show triboluminescence
Luminescence Present Yes
Absorption Spectrum Not diagnostic
Pleochroism None
Optics a = 1.558; β = 1.646; γ = 1.648. Biaxial (-). Some stones may appear uniaxial. 2V about 15º.
Optic Sign Biaxial -
Luster Vitreous
Specific Gravity 3.20
Transparency Transparent to translucent
Etymology For William E. Logan, first director of the Geological Survey of Canada.
Occurrence In an alkalic sill intruding a limestone at St. Michel, Montreal Island, Quebec, Canada.

Optics: a= 1.558; β= 1.646; γ=1.648.

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

Ready to learn how to identify gems on your own?

Join our mailing list below to download a FREE gem ID checklist tutorial. See what’s inside…

• Discover the 17 practical steps to gemstone identification (even if you’re just getting started with gemology)

• Learn how you can use specific tools to gather data, make observations & arrive at an accurate ID

• Explore a range of gemological tests… not only will you get familiar with the process but also time-saving shortcuts!