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Poldervaartite can be found in a light orange-pink to milky-white color. High-quality poldervaartite specimens are prized by collectors and facetable material is rare.

Poldervaartite Polished
Poldervaartite Classification
Common Name Poldervaartite
Species Poldervaartite
Poldervaartite Optical Properties
Transparency Transparent - Translucent
Dispersion Strength: Weak Fire
Refractive Index 1.634-1.656
Birefringence 0.022
Optic Character Biaxial
Optic Sign Positive
Polariscope Reaction Aggregate (AGG), Doubly Refractive (DR)
Fluorescence SWUV: Moderate red or pinkish white to pink
LWUV: Weak red or pinkish white to pink
Pleochroism Trichroic, unobservable or weak, varying shades of body color
Poldervaartite Characteristic Physical Properties
Hardness 5
Specific Gravity Typical:2.910
Toughness Poor
Luster Vitreous
Fracture Uneven
Cleavage None
Poldervaartite Chemistry & Crystallography
Chemical Name calcium manganese silicate hydroxide
Chemical Formula (Ca,Mn2+)2(SiO3OH)(OH)
Crystal System Orthorhombic
Chemistry Classification Silicate

Poldervaartite Colors

  • White Poldervaartite White
  • Pink Poldervaartite Pink
  • Colorless Poldervaartite Colorless

Countries of Origin

South Africa

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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.