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Szaibelyite is basic magnesium borate mineral named after Stephen Szaibely (Sj√°jbely). It is pale yellow to white and has a fibrous structure.

Szaibelyite Polished
Szaibelyite Classification
Common Name Szaibelyite
Species Szaibelyite
Szaibelyite Optical Properties
Transparency Opaque-Translucent
Refractive Index 1.530-1.740
Birefringence 0.020- 0.070
Optic Character Biaxial
Optic Sign Negative
Polariscope Reaction Aggregate (AGG)
Pleochroism None
Szaibelyite Characteristic Physical Properties
Hardness 3-3.5
Specific Gravity 2.620
Toughness Poor
Luster Silky, Dull
Fracture Fibrous
Cleavage None
Szaibelyite Chemistry & Crystallography
Chemical Name Magnesium Borate Hydroxide
Chemical Formula MgBO2(OH)
Crystal System Monoclinic
Chemistry Classification Borate

Szaibelyite Colors

  • White Szaibelyite White
  • Yellow Szaibelyite Yellow
  • Colorless Szaibelyite Colorless


Szaibelyite is slowly soluble in acid

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Tim Matthews


Tim Matthews

Tim Matthews is President and Chief Executive Officer of Jewelry Television® (JTV), as well as a member of the company's Board of Directors. He oversees and leads all aspects of the company's powerful omni-digital retail platform that uniquely specializes in fine jewelry and gemstones. His passion for business and gemstones has led him to become a recognized expert in the field of gemology. He is a life member of the Gemmological Association of Great Britain (Gem-A) and has earned Gem-A's highest degrees, the Gemmology (FGA) and Diamond (DGA) diplomas. He is also a Graduate Gemologist (GG) of the Gemological Institute of America (GIA) and has also completed GIA's Graduate Diplomas in Diamonds, Colored Stones and Pearls. Under his leadership, JTV has become the leader in the sourcing and selling of color gemstones and jewelry.

This page was created on June 27, 2014.

This page was last edited on October 24, 2019.