Picture Agate | Gemopedia

Picture agate displays natural inclusions that formed within the stone in such a way as to create well-defined images. These images have a natural, life-like, picturesque appearance and make picture agate a treasured stone among gemstone lapidaries.
Alternate
Names
Landscape Agate Or Fortification Agate
Colors
Various Colors

Picture Agate Classification

Common Name

Picture Agate

Species

Quartz

Variety

Chalcedony

Colors

Various Colors

Alternate Names

Landscape Agate Or Fortification Agate

Gemstone Groups

Key Separations

RI, SG, appearance and fracture

Comments

Picture Agate Optical Properties

Transparency

Semitransparent - 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

None

Dispersion

Comments

Picture Agate Chemistry & Crystallography

Chemical Name

silicon dioxide (aka silica)

Chemical Formula

SiO2

Synthesis

Crystal System

Trigonal

Classification

Silicate

Nature

Natural

Crystallinity

Polycrystalline

Comments

Picture Agate Characteristic Physical Properties

Hardness

6.5-7

Streak

Specific Gravity

2.55-2.7 Typical:2.6

Toughness

Excellent

Inclusions

The picture agate inclusions form a pattern that give the appearance of a landscape or picture.

Luster

Vitreous

Stability

Good

Fracture

Conchoidal, Granular

Cleavage

None

Comments

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