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Phosphosiderite is a vibrant purple orchid color and is a relative newcomer to the world of gemstones as it was only discovered in the late 19th century. Fine quality phosphosiderite is hard to come by and this opaque gemstone may contain veins of yellow. In addition to purple, phosphosiderite occurs in colors ranging from white, pink, red, violet red and colorless.

Phosphosiderite Polished
Phosphosiderite Classification
Common Name Phosphosiderite
Species Phosphosiderite
Phosphosiderite Optical Properties
Transparency Transparent - Opaque
Dispersion Strength: Extreme Fire
Refractive Index 1.692-1.739
Birefringence 0.046
Optic Character Biaxial
Optic Sign Negative
Polariscope Reaction Aggregate (AGG), Doubly Refractive (DR)
Pleochroism Trichroic, weak to moderate pinkish red, purplish red, and colorless
Phosphosiderite Characteristic Physical Properties
Hardness 3.5-4
Streak White
Specific Gravity 2.740-2.800
Toughness Poor
Inclusions Phosphosiderite sometimes has botryoidal or radial fibrous structure and might have yellow veins.
Luster Vitreous
Fracture Uneven
Cleavage Good, in one direction, Poor, in one direction
Phosphosiderite Chemistry & Crystallography
Chemical Name hydrated iron phosphate
Chemical Formula Fe3+PO4.2H2O
Crystal System Monoclinic
Chemistry Classification Phosphate

Phosphosiderite Colors

  • Colorless Phosphosiderite Colorless
  • Red Phosphosiderite Red
  • Purple Phosphosiderite Purple
  • Pink Phosphosiderite Pink
  • Blue Phosphosiderite Blue
  • Orange Phosphosiderite Orange
  • Green Phosphosiderite Green

Countries of Origin

United States of America (the); Chile; Peru


Gentle care, moderately soft. Avoid ultrasonic cleaners, heat and harsh cleaners.

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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.