metamorphic
Jadeite Jade
Jadeite (Sodium Aluminum Silicate, NaAlSi₂O₆)
Hardness: 6.5-7.0 (Mohs scale); Color: Pale green to olive green with brown oxidation; Luster: Vitreous to greasy; Structure: Monoclinic, typically found in microcrystalline interlocking masses; Cleavage: Prismatic, but rarely visible in massive form; Specific gravity: 3.25–3.35.
- Hardness
- 6
- Color
- Pale green to olive green with brown oxidation
- Luster
- Vitreous to greasy
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Physical properties
Hardness: 6.5-7.0 (Mohs scale); Color: Pale green to olive green with brown oxidation; Luster: Vitreous to greasy; Structure: Monoclinic, typically found in microcrystalline interlocking masses; Cleavage: Prismatic, but rarely visible in massive form; Specific gravity: 3.25–3.35.
Formation & geological history
Formed under high-pressure, low-temperature metamorphic conditions in subduction zones. It is commonly found in serpentinite rocks as part of the Blueschist facies. Associated with various geological ages from the Mesozoic to Cenozoic eras.
Uses & applications
Primary use is in fine jewelry (cabochons, beads, bangles) and ornamental carvings. High-grade specimens are extremely valuable in East Asian markets. Historically used for making axe heads and tools due to its toughness.
Geological facts
Jadeite is one of two distinct minerals commonly known as 'Jade,' the other being Nephrite. Jadeite is rarer, harder, and typically more valuable. Its toughness comes from the interlocking felt-like structure of its micro-crystals, making it exceptionally resistant to fracturing.
Field identification & locations
Identify in the field by its high density (it feels heavy for its size), smooth and waxy feel when water-worn, and extreme toughness (resistant to breaking with a hammer). Common locations include Myanmar (Burma), Guatemala, Japan, and California, USA. Collectors look for translucency and 'vibrant' color saturation.
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