mineral

Moonstone with Black Tourmaline

Feldspar (KAlSi3O8) with inclusions of Schorl (NaFe3Al6(BO3)3Si6O18(OH)4)

AI-generated identification · may be incorrect

Hardness: 6-6.5 (Moonstone), 7-7.5 (Tourmaline); Color: White/creamy with black inclusions; Luster: Vitreous to pearly; Crystal structure: Monoclinic/Triclinic (Feldspar) and Hexagonal (Tourmaline).

Hardness: 6-6
Color: White/creamy with black inclusions
Luster: Vitreous to pearly

Identified June 8, 2026More mineral →

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Physical properties

Hardness: 6-6.5 (Moonstone), 7-7.5 (Tourmaline); Color: White/creamy with black inclusions; Luster: Vitreous to pearly; Crystal structure: Monoclinic/Triclinic (Feldspar) and Hexagonal (Tourmaline).

Formation & geological history

Forms in igneous and metamorphic environments, specifically in pegmatites where slow cooling allows large crystals of feldspar and tourmaline to grow together.

Uses & applications

Primarily used for ornamental purposes, jewelry (cabochons), and by mineral collectors for its metaphysical associations.

Geological facts

The 'Moonstone' here is usually a variety of white Labradorite or Orthoclase; when it contains black needle-like inclusions, it is often referred to as Black Tourmaline in Moonstone.

Field identification & locations

Identify in the field by looking for the 'adularescence' (blue/white sheen) of the feldspar combined with the distinct trigonal/hexagonal black prismatic tourmaline crystals. Found commonly in Madagascar and India.