Dendritic Agate | Gemopedia

This agate variety is termed "dendritic" due to its internal collection of dendrites. Dendrites are fern-like inclusions of iron, manganese, or other metallic oxides that create bold patterns within the gem. Typically, dendritic agates are cut into slabs to best exhibit nature's artwork. As you might guess, these pieces are one-of-a-kinds, as no two dendritic patterns are exactly the same.
Alternate
Names
Mocha Stone, Scenic Agate
Colors
Colorless, White, Whitish Gray With Green, Brown, Black Inclusions

Dendritic Agate Classification

Common Name

Dendritic Agate

Species

Quartz

Variety

Chalcedony

Colors

Colorless, White, Whitish Gray With Green, Brown, Black Inclusions

Alternate Names

Mocha Stone, Scenic Agate

Gemstone Groups

Key Separations

RI, SG, appearance and structure

Comments

Dendritic Agate Optical Properties

Transparency

Transparent - 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

Strength: none

Comments

Dendritic Agate Chemistry & Crystallography

Chemical Name

silicon dioxide (aka silica)

Chemical Formula

SiO2

Synthesis

Crystal System

Trigonal

Classification

Silicate

Nature

Natural

Crystallinity

Polycrystalline

Comments

Dendritic Agate Characteristic Physical Properties

Hardness

6.5-7

Streak

White

Specific Gravity

1.55-1.7 Typical:1.6

Toughness

Excellent

Inclusions

Dendritic inclusions are green, brown or black iron or manganese and look like branches.

Luster

Vitreous

Stability

Good

Fracture

Conchoidal

Cleavage

None

Comments

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