Lapis Lazuli Identification Guide
A guide to identifying lapis lazuli by its deep blue lazurite, golden pyrite flecks, and white calcite.
Read the full Lapis Lazuli encyclopedia entry →
What Lapis Lazuli Looks Like
Lapis lazuli is a metamorphic rock, not a single mineral. Its rich, deep ultramarine to royal blue comes from the mineral lazurite; it is typically peppered with brassy-gold flecks of pyrite and streaked or veined with white calcite. The best material is an even, intense blue with sparse pyrite and little calcite. It is opaque with a dull to slightly vitreous (waxy when polished) luster, and the texture is granular.
Step-by-Step Field ID Checklist
- Confirm the blue - deep, saturated ultramarine, not pale or banded.
- Look for pyrite flecks - metallic gold sparkles scattered through the blue are a hallmark of natural lapis.
- Spot white calcite - milky veins or patches are common in genuine, lower-grade lapis.
- Test hardness - Mohs 5-5.5; a steel knife will scratch it.
- Check opacity and luster - opaque, dull to waxy, granular texture.
Key Diagnostic Tests
- Mohs hardness 5-5.5: Scratched by a steel knife and quartz - softer than most blue gem look-alikes.
- Pyrite inclusions: Metallic, magnetic-free gold flecks; their presence strongly supports natural lapis.
- Calcite veins fizz in acid: A drop of dilute HCl on a white vein effervesces (the lazurite itself may give a faint reaction and can emit an H2S "rotten egg" smell with acid).
- Streak: Light blue.
- Specific gravity ~2.7-2.9.
Common Look-Alikes and How to Tell Them Apart
- Sodalite: Lighter, more violet-blue, with white veining but no pyrite; lower density and often more mottled.
- Azurite: Deep blue but a copper carbonate that fizzes strongly in acid and is softer (3.5-4); often with green malachite.
- Dumortierite quartz / dyed howlite ("dyed lapis"): Dyed imitations show color concentrated in cracks, lack genuine pyrite (or have fake gold paint), and may be harder (dyed quartz/howlite) or softer; acetone may remove dye.
- Lazulite: A different blue phosphate mineral, harder (5.5-6) and not rock-textured with pyrite.
- Synthetic/"Gilson" lapis: Too uniform, with evenly distributed fake pyrite and a chalky texture.
Where Lapis Lazuli Is Found
The finest lapis has come for millennia from the Sar-e-Sang mines of Badakhshan, Afghanistan. Other sources include the Andes of Chile, the Lake Baikal region of Russia (Siberia), and smaller deposits in Pakistan, Myanmar, and the USA (Colorado, California).
Frequently asked questions
How can you tell if lapis lazuli is real?
Genuine lapis is deep ultramarine blue, opaque, hardness 5-5.5 (scratched by a knife), and usually shows natural brassy pyrite flecks and white calcite veins. Dyed imitations show color pooling in cracks, lack real pyrite, and may release dye with acetone.
What does lapis lazuli look like?
A deep royal-blue opaque rock speckled with metallic gold pyrite flecks and streaked with white calcite, with a granular texture and waxy luster when polished.
Lapis lazuli vs sodalite - what's the difference?
Sodalite is a lighter, more violet-blue mineral with white veining but no pyrite flecks and lower density, while lapis is a richer ultramarine rock that characteristically contains golden pyrite.
Does lapis lazuli react to acid?
Its white calcite veins fizz in dilute hydrochloric acid, and the lazurite can give off a faint sulfurous (rotten-egg) smell with acid; this helps distinguish it from dyed quartz or howlite imitations.
What are the gold flecks in lapis lazuli?
They are tiny crystals of pyrite (fool's gold), a natural inclusion in lapis that produces its characteristic metallic golden sparkle.
Lapis Lazuli identified by the community
Recent Lapis Lazuli specimens identified with Rock Identifier.
