Chrysocolla
Last updated: April 2026
A hydrated copper silicate, often found mixed with quartz which increases its durability.
Chrysocolla has a specific gravity of 2.20 and a refractive index of 1.460–1.630, with a Mohs hardness of 2.5–7.0. It is aggregate.
Physical & Optical Properties
RI Range1.460–1.630
SG Range2.00–2.40
SG Typical2.20
Hardness (Mohs)2.5–7
Crystal SystemAmorphous
Optic CharacterAggregate
Dispersion0.000
Fluorescence LWInert
Fluorescence SWInert
Chelsea FilterInert
PleochroismNone
ColorsGreen, Blue Violet
SpeciesChrysocolla
Key Differentiators
- Cyan (blue-green) color
- Very variable hardness and properties
- Often found with malachite and azurite
Common Simulants
- Turquoise: Turquoise has higher SG (2.76) and RI (1.610–1.650); waxy luster; HCl does not foam.
Commonly Confused With
Commonly confused with: Turquoise.
Treatments
- Stabilized (resin-impregnated for durability)
Price Context
Natural — low ($/ct)$2
Natural — high ($/ct)$20
NotePer carat; ornamental stone; gem silica (high silica variety) can reach $100+/ct
Price context is approximate. GemID is not an appraisal tool. Results are indicators, not certified valuations.
Measurement Guides
Identifying a chrysocolla? GemID walks through these tests in order — RI, SG, fluorescence, and more.
Try GemID Free →Studying for the GIA, FGA, or FEEG practical? Chrysocolla is one of the 130 species in GemID’s drill and exam pool — practice identifying it from its measured properties under timed exam conditions.
Practice exams →