What Is Lapis Lazuli? Actually a Rock, Not a Mineral

Lapis lazuli is technically a rock, not a single mineral — an aggregate of several minerals fused together. Its deep blue comes mainly from lazurite, a mineral in the sodalite group (a genuine chemical relative of sodalite itself); white streaks are calcite; and the metallic gold flecks fine lapis is known for are pyrite.

Grading

Quality is judged primarily by how deep, even and calcite-free the blue is. The finest material shows a rich, uniform ultramarine blue with minimal white calcite veining and fine, evenly distributed pyrite; heavier white veining or dull, greyish-blue color indicates lower-grade material, which is sometimes dyed to even out its appearance.

The Ultramarine Connection

For centuries before synthetic alternatives existed, lapis lazuli was ground into the pigment ultramarine — literally "beyond the sea," referencing its import route from Afghanistan into Europe. Ultramarine was, for a long stretch of art history, more expensive than gold by weight, which is why Renaissance painters reserved it for the most important elements of a painting, often the Virgin Mary's robes.

Spotting Imitations

Dyed howlite or magnesite (porous white minerals) are common lower-cost imitations, generally identifiable by their overly uniform color and lack of genuine pyrite flecks — imitation "gold flecks" are sometimes simply painted or glued on rather than naturally embedded, and tend to look flatter and less randomly distributed than real pyrite inclusions.

Where It's Mined

The Sar-e-Sang mines in Afghanistan's Badakhshan province have been worked for more than 6,000 years, making them among the oldest continuously mined gem deposits on Earth — lapis from this region reportedly reached ancient Egypt and Mesopotamia via early trade routes. Chile and Russia are other historically notable sources.

Quick Facts

Composition: a rock made of lazurite, calcite and pyrite — Hardness: 5–5.5 on the Mohs scale — Historically ground into the pigment ultramarine — Oldest continuously worked source: Afghanistan's Sar-e-Sang mines.