Chrysocolla | Gemopedia

Chrysocolla, derived from the Greek chyrysos meaning "gold," is a copper mineral. Crystals are very rarely seen, but it is frequently intergrown with other minerals such as quartz or opal. This results in a harder, more resilient gemstone, as pure chrysocolla is soft and fragile. Its copper content is responsible for chrysocolla's range of bright green to blue hues.
Colors
Blue To Green

Chrysocolla Classification

Common Name

Chrysocolla

Species

Chrysocolla

Variety

Colors

Blue To Green

Alternate Names

Gemstone Groups

Key Separations

RI, birefringence and appearance

Comments

Chrysocolla usually found as an inclusion in quartz, chalcedony or opal. Sometimes is found as druze.Misnomer: Abdollah-Giw Turquoise

Chrysocolla Optical Properties

Transparency

Translucent - Opaque

Refractive Index

1.46-1.57

Birefringence

0.023-0.04

Optic Character

Biaxial

Optic Sign

Negative

Polariscope Reaction

Doubly Refractive (DR)

Fluorescence

SWUV: Inert
LWUV: Inert

CCF Reaction

Pleochroism

Unobservable

Dispersion

Strength: none

Comments

Chrysocolla Chemistry & Crystallography

Chemical Name

hydrated copper silicate

Chemical Formula

(Cu,Al)2H2Si2O5(OH)4.nH2O

Synthesis

Crystal System

Monoclinic

Classification

Silicate

Nature

Natural

Crystallinity

Crystalline to Aggregate

Comments

Chrysocolla Characteristic Physical Properties

Hardness

2-4

Streak

Green-White

Specific Gravity

2-2.4

Toughness

Poor

Inclusions

Chrysocolla often shows botryoidal growth structure and it often intergrown with chalcedony, malachite and turquoise.

Luster

Vitreous

Stability

Poor

Fracture

Conchoidal

Cleavage

None

Comments

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