Loose gemstone

Feldspar - Moonstone

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Details

Carat: 4.83 ct
Dimensions: 12.7 x 9.3 x 5.3 mm
Cut: Octagon Mixed cut
Shape: Octagon
Cutting style: Mixed cut
Colour: Bone
Clarity: Slightly included
Treatment: Untreated
Origin: Tanzania
Stone number: 7925

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· Mineralogy ·

Moonstone

Moonstone carries its light not in color but in sheen: adularescence sends a soft glow travelling across the stone as it moves. In warmer stones, a delicate golden tone lies beneath.

6 - 6.5

Mohs hardness

monoclinic

Crystal system

1.518 - 1.526

Refractive index

Untreated

Natural stone

Properties

Mineral group: Feldspar (orthoclase / adularia)
Chemical formula: KAlSi₃O₈
Colorant: none - the sheen comes from lamellar structure, not from trace elements
Crystal system: monoclinic
Hardness (Mohs): 6 - 6.5
Density: approx. 2.56 - 2.59 g/cm³
Refractive index: 1.518 - 1.526
Optical character: anisotropic, biaxial negative
Birefringence: 0.005 - 0.008
Special feature: adularescence (sheen from light scattering on fine growth lamellae)
Fluorescence: weak bluish
Cleavage: perfect
Luster: vitreous to pearly

Why this stone

Not a stone that sparkles - one that glows. That makes it the quietest and most personal piece in the collection.

Tradition

Moonstone is associated with intuition, gentleness, and cycles. It is traditionally regarded as the stone of the inner voice and of calm.

Care

Soft (Mohs 6 - 6.5) and with perfect cleavage: no ultrasonic cleaning, protect from knocks and scratches, store separately.