How to identify Jade

To correctly identify Jade (Jadeite or Nephrite), check each of these features in order. Many rocks and minerals look alike, so cross-reference multiple properties before deciding.

Step-by-step identification

1. 1

   Color

   Overall color and any zoning or banding

   Jadeite: Typically ranges from white, green (apple green, emerald green, 'imperial' green), lavender, yellow, orange, brown, black. Nephrite: Typically ranges from creamy white, green (spinach green, dark green), gray, brown, black.

2. 2

   Luster

   How the surface reflects light: metallic, vitreous, dull

   Vitreous to greasy, sometimes waxy.

3. 3

   Texture

   Grain size and surface feel: coarse, fine, glassy

   Both Jadeite and Nephrite exhibit a fine-grained, interlocking fibrous or granular texture, contributing to their exceptional toughness. Jadeite tends to be more granular, while Nephrite is more fibrous.

4. 4

   Crystal Form

   Shape of visible crystals or crystal faces

   Both typically occur as massive, compact aggregates. Individual crystals are microscopic and intergrown, forming a tough, felted or granular mass.

5. 5

   Cleavage

   How it breaks: flat cleavage planes vs irregular fracture

   Jadeite: Two distinct cleavages at approximately 87° and 93°. Nephrite: Two distinct cleavages at approximately 56° and 124° (typical for amphiboles). However, due to their massive, interlocking nature, cleavage is rarely observed in hand specimens and fracture is more common.

6. 6

   Geological Environment

   The rock formation and setting where it occurs

   Jadeite: High-pressure, low-temperature metamorphic rocks, often associated with serpentinite in subduction zones. Nephrite: Metamorphosed ultramafic rocks (serpentinites) or dolomitic limestones, often in contact metamorphic settings or within serpentinite bodies.

Key Facts

Hardness

Jadeite: 6.5-7 on Mohs scale. Nephrite: 6-6.5 on Mohs scale.

Specific Gravity

Jadeite: 3.30-3.38 g/cm³. Nephrite: 2.90-3.03 g/cm³.

Crystal System

Jadeite: Monoclinic. Nephrite: Monoclinic.

Color

Jadeite: Wide range including green, white, lavender, yellow, orange, brown, black. Nephrite: Creamy white, various shades of green, gray, brown, black.

Luster

Vitreous to greasy, sometimes waxy.

Transparency

Opaque to translucent, rarely semi-transparent.

Fracture

Splintery to granular (Jadeite), splintery to fibrous (Nephrite).

Cleavage

Jadeite: Two distinct cleavages at ~87°/93°. Nephrite: Two distinct cleavages at ~56°/124°. Rarely observed due to massive habit.

Composition

Jadeite: Sodium aluminum silicate (NaAlSi2O6). Nephrite: Calcium magnesium iron silicate hydroxide (Ca2(Mg,Fe)5Si8O22(OH)2).

Physical characteristics

• Crystal Habit: Typically massive, compact, granular (Jadeite) or fibrous (Nephrite) aggregates. Individual crystals are microscopic.
• Cleavage Type: Jadeite: Prismatic {110} at ~87°/93°. Nephrite: Prismatic {110} at ~56°/124°. Imperfect to good, but rarely seen due to aggregate nature.
• Fracture Type: Splintery to granular (Jadeite), splintery to fibrous (Nephrite).
• Tenacity: Extremely tough (due to interlocking microstructure), making it resistant to breaking and chipping.
• Luster Type: Vitreous to greasy, sometimes waxy.

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