Chrysocolla-In-Chalcedony | Gemopedia

Chrysocolla forms as a decomposition product of copper minerals and frequently is intergrown with other minerals, in this case, with chalcedony. Also referred to as "gem silica," it is one of the rarest and most treasured variety of chalcedony. The gem may be seen in blue to blue-green color, and may be opaque to almost transparent.
Alternate
Names
Chrysocolla Quartz, Cuprian Chalcedony, Gem Silica
Colors
Blue To Green-Blue

Chrysocolla-In-Chalcedony Classification

Common Name

Chrysocolla-In-Chalcedony

Species

Chrysocolla, Quartz

Variety

Chrysocolla-In-Chalcedony

Colors

Blue To Green-Blue

Alternate Names

Chrysocolla Quartz, Cuprian Chalcedony, Gem Silica

Gemstone Groups

Key Separations

RI, SG, appearance and fracture

Comments

Might be unevenly colored and might be mistaken for turquoise. Colored by copper mineral chrysocolla or copper salts.

Chrysocolla-In-Chalcedony Optical Properties

Transparency

Translucent - Semitranslucent

Refractive Index

1.535-1.539

Birefringence

0.004-0.004

Optic Character

Uniaxial

Optic Sign

Positive

Polariscope Reaction

Aggregate (AGG)

Fluorescence

SWUV: Inert
LWUV: Inert

CCF Reaction

Pleochroism

Unobservable

Dispersion

Strength: none

Comments

Chrysocolla-In-Chalcedony Chemistry & Crystallography

Chemical Name

silicon dioxide (aka silica)

Chemical Formula

SiO2

Synthesis

Crystal System

Trigonal

Classification

Silicate

Nature

Natural

Crystallinity

Polycrystalline

Comments

Chrysocolla-In-Chalcedony Characteristic Physical Properties

Hardness

6.5-7

Streak

Specific Gravity

2.55-2.7 Typical:2.6

Toughness

Excellent

Inclusions

Chrysocolla-in-chalcedony might be unevenly colored.

Luster

Vitreous

Stability

Good

Fracture

Conchoidal, Granular

Cleavage

None

Comments

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