Azurite
Azurite is one of the most intensely blue minerals in nature — a copper carbonate that forms alongside malachite in the oxidation zones of copper deposits. Bisbee, Arizona produced legendary azurite specimens, including the famous "Bisbee Blue" azurite-malachite combinations prized by museums and collectors worldwide. It was historically ground as a blue pigment used in Renaissance paintings.
Physical Properties
Chemical Formula
Cu₃(CO₃)₂(OH)₂
Hardness (Mohs)
3.5–4
Color
Deep azure blue, vivid blue
Luster
Vitreous
Crystal System
Monoclinic
Streak
Blue
Cleavage
Perfect in one direction
Specific Gravity
3.77
🔍 Field Identification Tips
Intense azure to deep blue color unlike any other common mineral. Blue streak (rare — most minerals streak white). Hardness 3.5–4. Fizzes in acid (carbonate). Often found alongside green malachite — the blue-green combination is unmistakable. Converts to malachite over time when exposed to air and moisture.
Varieties & Forms
📍 Where to Find Azurite in the US
Uses & Applications
Collectors specimens, historical blue pigment ("mountain blue"), jewelry, combination stones.
💰 Collector Value Guide
Small tumbled: $5–$30. Crystalline specimens: $50–$500. Bisbee azurite-malachite combinations: $100–$5,000. Museum-quality crystals: $5,000–$50,000+.
Find Azurite With Our Tools
Use the We Lick Rocks app to identify specimens, find dig sites, and connect with local rockhounds.