Pietersite | Gemopedia

Pietersite is a striking variety of chalcedony that comes primarily from Namibia and, more recently, China. It commonly exhibits various shades of color, ranging from blue to gray and red to yellow and brown. Pietersite displays chatoyancy similar to tigers eye quartz.
Colors
Blue-Gray, Brown, Golden Yellow, Red

Pietersite Classification

Common Name

Pietersite

Species

Quartz

Variety

Chalcedony

Colors

Blue-Gray, Brown, Golden Yellow, Red

Alternate Names

Gemstone Groups

Key Separations

Color, appearance, structure and RI

Comments

Pietersite is similar to tiger's-eye but pietersite is a chalcedony and tiger's-eye is a macrocrystalline quartz.

Pietersite Optical Properties

Transparency

Semitranslucent - Opaque

Refractive Index

1.544-1.553
Tolerance:very constant

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

Pietersite Chemistry & Crystallography

Chemical Name

silicon dioxide (aka silica)

Chemical Formula

SiO2

Synthesis

Crystal System

Trigonal

Classification

Silicate

Nature

Natural

Crystallinity

Aggregate

Comments

Pietersite Characteristic Physical Properties

Hardness

7

Streak

Specific Gravity

2.64-2.69 Typical:2.66

Toughness

Good

Inclusions

Pietersite's broken up undulating chatoyant fibrous structure was caused by geologic stresses.

Luster

Vitreous

Stability

Good

Fracture

Splintery

Cleavage

None

Comments

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