Jade

Hardness: Nephrite (6-6.5 on Mohs scale), Jadeite (6.5-7 on Mohs scale). Color: Varies widely, including green (most common), white, lavender, yellow, orange, gray, and black. Luster: Vitreous to greasy. Crystal Structure: Nephrite (microcrystalline, interlocking fibrous structure), Jadeite (microcrystalline, interlocking granular structure). Cleavage: None (due to interwoven crystalline structure). Specific Gravity: Nephrite (2.9-3.03), Jadeite (3.3-3.38). The beads in the image show translucent light green and near-white colors.

Jade forms under conditions of regional metamorphism, often in subduction zones. Nephrite is typically found in serpentinite rocks, formed from the alteration of ultramafic igneous rocks. Jadeite forms at higher pressures and lower temperatures than nephrite, typically in blueschist metamorphic facies. Geological Age: Varies depending on tectonic activity, often associated with ancient mountain-building events.

Historically and presently used extensively for carving, jewelry, ornamental objects, and religious artifacts. Its toughness makes it suitable for intricate carvings and tools in ancient cultures. In modern times, it's highly valued in jewelry (bracelets, pendants, earrings) and as a decorative stone.

Jade has been revered in many cultures, especially in China, where it symbolizes purity, longevity, health, and royalty. The Olmec and Mayan civilizations also used jade extensively. Due to its exceptional toughness, it was used for tools and weapons before the advent of metalworking. The term 'jade' can be misleading as it encompasses two different mineral species with distinct chemical compositions.

In the field, distinguishing true jade from imitations can be challenging. Key identifiers for high-quality jade include its characteristic greasy to vitreous luster, cool-to-the-touch feel, and exceptional toughness (resistance to breaking). Nephrite often has a fibrous appearance; jadeite can be more granular. Commonly found in Mesoamerica, Burma (Myanmar), New Zealand, China, Russia, and Canada. For collectors, understanding the difference between jadeite and nephrite is crucial due to their differing values (jadeite generally being more valuable, especially 'Imperial Jade'). Look for translucency, vibrant color, and uniformity in quality.