Rock Identifier
Labradorite (Polished Crystal Point) (Labradorite (a calcium-enriched feldspar mineral), (Ca, Na)(Al, Si)4O8) — mineral
mineral

Labradorite (Polished Crystal Point)

Labradorite (a calcium-enriched feldspar mineral), (Ca, Na)(Al, Si)4O8

Hardness: 6.0-6.5 on Mohs scale; Color: Gray-green to dark gray; Luster: Vitreous to pearly; Crystal structure: Triclinic; Cleavage: Perfect in two directions; Specific Gravity: 2.68 to 2.72.

Hardness
6
Color
Gray-green to dark gray
Luster
Vitreous to pearly
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Physical properties

Hardness: 6.0-6.5 on Mohs scale; Color: Gray-green to dark gray; Luster: Vitreous to pearly; Crystal structure: Triclinic; Cleavage: Perfect in two directions; Specific Gravity: 2.68 to 2.72.

Formation & geological history

Forms in mafic igneous rocks such as basalt and gabbro, often found in large, anorthositic masses. Significant deposits date back to various geological eras, notably from the Proterozoic eon in locations like the Nain Complex.

Uses & applications

Used primarily as an ornamental stone, in jewelry (cabochons), as a decorative building material ('Blue Pearl' granite), and for metaphysical collecting.

Geological facts

First discovered in Labrador, Canada, in 1770. It is famous for 'labradorescence,' an optical effect where light reflects off internal twinning planes to create flashes of blue, green, and gold.

Field identification & locations

Identify by rotating under a light source to find the 'flash' or schiller effect. Common locations include Canada, Madagascar, Norway, and Russia. This specific specimen is carved and polished into a 'tower' or 'obelisk' shape.

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