metamorphic
Jade (likely nephrite)
Nephrite jade: interlocking actinolite–tremolite amphibole, Ca₂(Mg,Fe)₅Si₈O₂₂(OH)₂; exact identification requires testing
AI-generated identification · may be incorrectLight green, opaque to slightly translucent, greasy-to-waxy luster, and fibrous/interlocking texture; Mohs hardness about 6–6.5, tough with no obvious cleavage, and specific gravity about 2.9–3.1. The item appears polished and set in metal.
Identified More metamorphic →
Explore Jade (likely nephrite) in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Light green, opaque to slightly translucent, greasy-to-waxy luster, and fibrous/interlocking texture; Mohs hardness about 6–6.5, tough with no obvious cleavage, and specific gravity about 2.9–3.1. The item appears polished and set in metal.
Formation & geological history
Forms through metamorphism and metasomatism of ultramafic or dolomitic rocks, commonly in serpentinite zones; deposits range from Paleozoic to recent geologic ages. A jadeite identification would instead indicate pyroxene jadeite, NaAlSi₂O₆, typically formed in high-pressure subduction zones.
Uses & applications
Used for carved ornaments, cabochons, beads, jewelry, tools, and cultural artifacts; value depends strongly on jade type, translucency, color, texture, treatment, and provenance.
Geological facts
Nephrite is exceptionally tough because of its felted amphibole fibers. Bright emerald-green “imperial jade” is usually jadeite, not nephrite, and laboratory testing is needed to distinguish them reliably.
Field identification & locations
Common sources include Myanmar, Guatemala, China, Canada, New Zealand, Russia, and Wyoming. Field clues include high toughness, waxy green appearance, and resistance to scratching by steel; dyeing, coatings, and imitations are common.
More like this
