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Lapis Lazuli Slab Chile

Lapis Lazuli Slab Chile

Chilean Lapis Lazuli (Flor de los Andes, Ovalle, Chile) is a lazurite-rich metamorphic rock with more calcite and diopside than Afghan lapis, giving it a lighter, patchier blue with occasional green and minimal pyrite. It has a light blue streak, hardness 5–5.5 Mohs, and SG ~2.7–2.9. Although considered lower grade than Afghan material, it is important as Chile’s national stone and is widely used for carvings, ornaments, and decorative slabs.

Declared the national stone of Chile in 1984. Mining has been irregular and small-scale, but Chilean lapis is important regionally and in South American lapidary work.

Comparison to Afghan Lapis:

Afghan Lapis: Deep, uniform ultramarine blue with golden pyrite, little calcite.
Chilean Lapis: Paler or patchy blue, with much more white calcite and green diopside, pyrite is rare or absent.

Because of this, Chilean lapis is less valued in the gem trade but still attractive for decorative objects.

Locality

Chile

Lapis Lazuli Slab Chile

Streak

Light blue

Hardness

Formula

5-5.5

Lazurite (blue): (Na,Ca)₈(AlSiO₄)₆(SO₄,S,Cl)₁–₂, Calcite (white patches/veins): CaCO₃

Habit

Massive, granular

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