Phosphosiderite
Phosphosiderite
Published: June 2014
Modified: November 2021
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.
General Information
Common Name
Phosphosiderite
Species
Phosphosiderite
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
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
Chemical Name
hydrated iron phosphate
Chemical Formula
Fe3+PO4.2H2O
Crystal System
Monoclinic
Chemistry Classification
Phosphate
Phosphosiderite Colors
-
Blue -
Colorless -
Green -
Orange -
Pink -
Purple -
Purple -
Purple -
Red
Countries of Origin
Unknown; United States of America; Chile; Peru
Care
Gentle care, moderately soft. Avoid ultrasonic cleaners, heat and harsh cleaners.