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Hydroxyapophyllite crystals are tabular and are frequently striated. It is typically colorless or white, but can be pink, light green, pale yellow, blue, brown, or violet. The mineral can be found in Jefferson, NC and Kimberley, South Africa.

Hydroxyapophyllite Polished
Hydroxyapophyllite Classification
Common Name Hydroxyapophyllite
Species Apophyllite
Hydroxyapophyllite Optical Properties
Transparency Translucent-Transparent
Refractive Index 1.542-1.543
Birefringence 0.001
Optic Character Uniaxial
Optic Sign Positive
Polariscope Reaction Aggregate (AGG), Doubly Refractive (DR)
Fluorescence SWUV: Inert
LWUV: Inert
Hydroxyapophyllite Characteristic Physical Properties
Hardness 4-5
Streak White
Specific Gravity 2.340-2.370 Typical 2.340
Toughness Poor
Luster Vitreous, Pearly
Fracture Uneven
Cleavage Perfect
Hydroxyapophyllite Chemistry & Crystallography
Chemical Formula KCa4(Si8O20)(OH,F) ยท 8H2O
Crystal System Tetragonal
Chemistry Classification Silicate

Hydroxyapophyllite Colors

  • Blue Hydroxyapophyllite Blue
  • White Hydroxyapophyllite White
  • Yellow Hydroxyapophyllite Yellow
  • Pink Hydroxyapophyllite Pink
  • Green Hydroxyapophyllite Green

Countries of Origin

United States of America (the); South Africa


Hydroxyapophyllite is brittle so care needs to be taken when handling.

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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.