Pink Opal | Gemopedia

Natural pink opal has no play of color and is a mixture of opal, palygorskite and chalcedony. Nicknamed the 'pink Andes opal', the soft pinks of this opal are appreciated as an environmentally friendly alternative to conch pearls as well as pink coral. Today, Peru is the major producer of this most feminine opal variety that is often carved into beads and occasionally faceted into gems.
Colors
Pale Pink To Dark Pink

Pink Opal Classification

Common Name

Pink Opal

Species

Opal

Variety

Pink Opal

Colors

Pale Pink To Dark Pink

Alternate Names

Gemstone Groups

Key Separations

Appearance, RI and fluorescence

Comments

Pink opal might have characteristics in between common opal and chalcedony because it can be composed of both materials.

Pink Opal Optical Properties

Transparency

Translucent - Opaque

Refractive Index

1.37-1.53

Birefringence

Optic Character

NA

Optic Sign

NA

Polariscope Reaction

Aggregate (AGG)

Fluorescence

SWUV: inert to strong green or yellowish green
LWUV: inert to strong green or yellowish green

CCF Reaction

Pleochroism

None

Dispersion

Comments

Pink Opal Chemistry & Crystallography

Chemical Name

hydrated silicon dioxide; opal, palygorskite and chalcedony

Chemical Formula

SiO2.nH2O

Synthesis

Crystal System

NA

Classification

Silicate

Nature

Natural

Crystallinity

Amorphous

Comments

Pink Opal Characteristic Physical Properties

Hardness

6

Streak

White

Specific Gravity

1.98-2.55

Toughness

Varies

Inclusions

Luster

Vitreous

Stability

Poor

Fracture

Conchoidal, Uneven

Cleavage

None

Comments

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