Type-C Jade | Gemopedia

Type-C jade is a trade term describing a type of jadeite jade. Type-C jade is commonly dyed to add color in lighter material, usually resulting in beautiful lavender or green hues. Jadeite jade is popular with lapidaries across the globe, especially in China where jade carving is a national art form.
Alternate
Names
Type-C Jadeite, Type-C Jade, Dyed, Bleach And Impregnated Jadeite
Colors
Almost Any Color

Type-C Jade Classification

Common Name

Type-C Jade

Species

Jadeite

Variety

Dyed, Bleach and Impregnated Jadeite

Colors

almost any color

Alternate Names

type-c jadeite, type-c jade, dyed, bleach and impregnated jadeite

Gemstone Groups

Key Separations

Appearance, RI, spectrum, SG and magnification. The detection of dyes might require advanced lab testing. Scratch test can be used but is destructive.

Comments

Dyed jadeite stones will have a broad band in the red area of the spectrum and natural jadeite colored with chrome will only have 3 lines in the yellow, orange and red.

Type-C Jade Optical Properties

Transparency

Semitransparent To Opaque

Refractive Index

1.666-1.68 Tolerance: (+0.008/-0.008)

Birefringence

Optic Character

Optic Sign

Polariscope Reaction

SR or AGG

Fluorescence

SWUV: Generally inertRed, pink or purple: weak to strong orange
LWUV: Generally inertRed, pink or purple: moderate to strong orange

CCF Reaction

Pleochroism

Dispersion

Comments

Type-C Jade Chemistry & Crystallography

Chemical Name

sodium aluminum silicate

Chemical Formula

NaAlSi2O6

Synthesis

Crystal System

Monoclinic

Classification

Silicate

Nature

Natural

Crystallinity

Polycrystalline

Comments

Type-C Jade Characteristic Physical Properties

Hardness

6.57

Streak

Specific Gravity

3.25-3.4 Typical: 3.34

Toughness

Excellent

Inclusions

Dyed jadeite is usually unevenly colored but sometimes you might be able to see dye concentrations under magnification. Type C jadeite has been bleached with acid to remove staining then dyed and often been impregnated with wax or polymers. Hopefully the dye is apparent in surface reaching cracks. Be careful not to confuse this with the color streaks in natural jadeite. It will show etch boundaries between the individual crystal grains. Advanced lab testing is usually required to detect polymer impregnation.

Luster

Vitreous To Greasy

Stability

Good

Fracture

Splintery To Granular

Cleavage

Not Visible Due To Aggregate Structure

Comments

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