Moonstone Crystal Mineral Madagascar Natural Feldspar Specimen 20-50mm

Genuine Moonstone Mineral Specimen – Madagascar

This listing is for a genuine Moonstone mineral specimen from Madagascar, sized approximately 20–50mm. The photograph shown represents an example of the actual specimen you will receive. Each piece is carefully selected for its natural colour, surface quality, and attractive optical character.

Your specimen includes a Certificate of Authenticity lifetime guarantee generic card, confirming it is a genuine natural mineral. Full sizing and scale can be seen clearly in the photographs.

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Mineral Species & Composition

Moonstone is a variety of feldspar, most commonly within the orthoclase and albite series. Feldspars are among the most abundant minerals in the Earth’s crust and are essential components of many igneous and metamorphic rocks.

Key mineral information:

• Mineral Type: Feldspar (Moonstone variety)

• Chemical Composition: Potassium aluminium silicate (KAlSi₃O₈) with albite intergrowths

• Crystal System: Monoclinic (orthoclase)

• Hardness: 6–6.5 on the Mohs scale

• Lustre: Vitreous to pearly

• Transparency: Translucent to opaque

Moonstone is best known for its unique optical effect called adularescence, a soft glow or sheen that appears to move across the surface when the stone is turned under light.

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Optical Effect – Adularescence

The characteristic shimmer of moonstone is caused by the internal structure of alternating feldspar layers. Light scatters between these microscopic intergrowths, producing a floating, moon-like sheen.

Depending on the specimen, adularescence may appear as:

• Silvery white glow

• Blue flash or sheen

• Soft pearly light effect

This natural optical phenomenon is one of the reasons moonstone is highly valued by collectors and lapidary enthusiasts.

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Geological Formation & Madagascar Origin

Moonstone forms in igneous and metamorphic environments, particularly in granitic pegmatites and high-grade metamorphic rocks. These settings allow feldspar minerals to crystallise slowly, creating the layered structures responsible for adularescence.

Madagascar is internationally known for producing attractive moonstone material with strong sheen and pleasing natural colour. The island’s complex geology includes ancient crystalline rock terrains rich in feldspar minerals.

Associated minerals in moonstone-bearing deposits may include:

• Quartz

• Tourmaline

• Garnet

• Mica

• Other feldspar varieties

Madagascan moonstone is especially sought after for its quality and visual appeal.

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Appearance & Natural Characteristics

Moonstone specimens typically display:

• Base colour: White, cream, pale grey, or soft peach tones

• Sheen: Pearly or silvery reflective glow

• Texture: Smooth natural surfaces or lightly shaped forms

• Transparency: Translucent to opaque

Natural inclusions, internal veils, or subtle colour zoning are common and confirm the authenticity of the mineral.

Each specimen is completely natural and untreated beyond possible shaping or polishing to enhance its optical effect.

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Size & Display Appeal (20–50mm)

With a size range of approximately 20–50mm, this moonstone specimen is ideal for:

• Mineral and crystal collections

• Display cabinets or shelves

• Educational geology study sets

• Lapidary or jewellery design projects

• Unique gifts for mineral enthusiasts

Its compact size makes it easy to display while still showcasing the distinctive moonstone shimmer.

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Collecting & Traditional Associations (Non-Medical)

Moonstone has long been admired for its luminous appearance and is traditionally associated in spiritual folklore with intuition and lunar symbolism. This listing presents the specimen strictly as a natural feldspar mineral collectible, without any medical or outcome-based claims.

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Authenticity & Product Details

• Genuine Moonstone mineral specimen

• Origin: Madagascar

• Size Range: Approximately 20–50mm

• Natural feldspar with adularescent sheen

• Carefully selected collector piece

• Includes Certificate of Authenticity lifetime guarantee generic card

• Photo shows an example of the actual specimen you will receive

A beautiful Madagascan moonstone specimen featuring classic feldspar structure and natural shimmering adularescence, perfect for collectors and lovers of distinctive optical minerals.