Dendritic Opal | Gemopedia

This opal 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 opals are cut into slices 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. Usually these opals are white, yellow, blue, green or pink and show the black inclusions well.
Colors
White With Black Dendrite Inclusions

Dendritic Opal Classification

Common Name

Dendritic Opal

Species

Opal

Variety

Dendritic Opal

Colors

White With Black Dendrite Inclusions

Alternate Names

Gemstone Groups

Key Separations

Appearance, RI and fluorescence

Comments

Dendritic Opal Optical Properties

Transparency

Translucent - Opaque

Refractive Index

1.37-1.52

Birefringence

Optic Character

NA

Optic Sign

Polariscope Reaction

Singly Refractive (SR) With ADR

Fluorescence

SWUV:
LWUV:

CCF Reaction

Pleochroism

None

Dispersion

Strength: none

Comments

Dendritic Opal Chemistry & Crystallography

Chemical Name

hydrated silicon dioxide

Chemical Formula

SiO2-nH2O

Synthesis

Crystal System

NA

Classification

Silicate

Nature

Natural

Crystallinity

Amorphous

Comments

Dendritic Opal Characteristic Physical Properties

Hardness

5-6.5

Streak

White

Specific Gravity

1.98-2.5 Typical:2.15

Toughness

Varies

Inclusions

Dendritic opal is milk opal that has dendritic inclusions that look like moss or ferns.

Luster

Vitreous

Stability

Poor

Fracture

Conchoidal, Uneven

Cleavage

None

Comments

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