LAPIS LAZULI

Lapis lazuli stud earrings

Species:  Lapis Lazuli
​​Mohs Hardness:  5 to 5.5 out of 10
Color:  Semi-translucent to opaque.  Medium to dark slightly greenish blue to violetish blue.  Could be mottled with different tones of blue with white calcite patches.  May have metallic gold pyrite flecks.
RI:  Vague readings around 1.500 and sometimes 1.670 due to calcite
Birefringence:  None
SR/DR/AGG:  AGG
Fluorescence:  Weak to moderate green or yellowish green under SW.  Calcite inclusions might fluoresce pink under LW.
SG:  2.75 (+/-0.25)
Routine Treatments:  None
Additional Enhancements:  Dyeing

Lapis Lazuli Facts

Pyrite inclusions in lapis lazuli

Lapis lazuli is an opaque gem known for its intense blue color with flecks of golden pyrite inclusions.

Lapis lazuli is composed of mostly lazurite, but is often mottled with calcite (white), sodalite (blue), and pyrite (gold).

Egyptians would grind lapis to use for cosmetic purposes, such as eyeliner.

Lapis Lazuli Gallery

All photos courtesy of Scott Papper, GIA GG, AJP, CMA (NAJA)