Lapis Lazuli

Lapis lazuli is a deep blue metamorphic rock (not a single mineral) valued since antiquity for its intense ultramarine color. Its blue comes mainly from the mineral lazurite, accompanied by white calcite and glittering brassy specks of pyrite that give the stone its starry appearance.

The finest lapis is a rich, even blue with minimal calcite and an attractive scatter of golden pyrite. It has been mined for over 6,000 years and was treasured by the Egyptians, who used it in Tutankhamun's burial mask.

Ground lapis was once the source of the precious pigment ultramarine, the most expensive blue paint in Renaissance Europe.

Lapis lazuli forms by contact metamorphism of limestone, where heat and chemically active fluids from nearby intrusions react with carbonate rock to crystallize lazurite and associated sulfur-bearing minerals. This is why lapis is a rock-forming assemblage rather than a single crystal.

The pyrite forms from sulfur and iron in the system, and residual calcite gives white veining.

The legendary source is the Sar-e-Sang mines of Badakhshan, Afghanistan, worked for thousands of years; other deposits occur in Chile, Russia (Lake Baikal), and the USA.

• Color: Deep, saturated ultramarine to royal blue—its hallmark.
• Inclusions: Golden pyrite flecks and white/gray calcite veining are strong identifiers.
• Hardness: 5-5.5; can be scratched by a steel knife and quartz.
• Opacity: Opaque with a dull to slightly waxy luster when polished.

Look-alikes: Dyed howlite or jasper ('Swiss lapis') lacks real pyrite and may rub off color. Sodalite is a similar blue but lacks pyrite and is more uniformly blue with white veins. Genuine lapis shows true gold pyrite specks, not painted-on gold.

Lapis lazuli is a historic ornamental gemstone, carved into beads, cabochons, inlays, vases, and seals, and set in jewelry. Its rich blue made it a status symbol across ancient Egypt, Mesopotamia, and Persia.

For centuries it was ground into ultramarine pigment, used by master painters for skies and the robes of the Virgin Mary until a synthetic version arrived in the 1800s.

Value depends on deep, even blue color, fine pyrite distribution, and minimal calcite. Metaphysically it is linked to wisdom and truth—cultural belief, not science.