Jade (likely Nephrite Jade based on appearance)

Hardness: 6-7 on Mohs scale. Color: Green, typically translucent to opaque. Luster: Vitreous to waxy. Crystal Structure: Monoclinic, but often found as massive or crypto-crystalline aggregates, hence distinct crystals are rare. No distinct cleavage, exhibits conchoidal fracture. Specific Gravity: 2.65-2.79.

Nephrite jade is a metamorphic mineral that forms in low-grade metamorphic conditions, typically in contact with serpentinite and other magnesium-rich rocks. It forms through the alteration of tremolite-actinolite minerals under high pressure and relatively low temperatures. Its geological age varies depending on the specific deposit, but it is often associated with ancient mountain-building events.

Primarily used in jewelry, carvings, and ornamental objects due to its toughness and ability to take a high polish. Historically, it was also used for tools and weapons in cultures where it was abundant.

Jade has been prized for millennia in various cultures, particularly in China and Mesoamerica, where it held significant spiritual and artistic value. Artifacts made of jade often symbolize purity, serenity, and protection. 'Jade' is a cultural term that encompasses two distinct minerals: nephrite and jadeite, which differ in their chemical composition and hardness.

To identify jade in the field: Look for its characteristic greenish color, often with variations in hue and patterning. Its toughness (resistance to breakage) is a key identifier; it's difficult to scratch with a steel knife (though a higher Mohs hardness mineral could scratch it). It often has a waxy feel when polished. Common locations include New Zealand, Canada (British Columbia), Russia, China, and parts of the United States (Wyoming, California, Alaska). Tips for collectors: distinguish between true jade (nephrite or jadeite) and common simulants like serpentine or aventurine quartz by testing hardness and density, and by observing its characteristic fibrous texture on broken surfaces (though often polished).