Purple scapolite

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Purple scapolite is a rock-forming silicate mineral composed of aluminium, calcium, and sodium silicate with chlorine, as well as carbonate and sulfate. The two endmembers are meionite (Ca4Al6Si6O24CO3) and marialite (Na4Al3Si9O24Cl). Silvialite (Ca,Na)4Al6Si6O24(SO4,CO3) is also a recognized member of the group.

Purple scapolite properties

This group is an isomorphous mixture of the meionite and marialite endmembers. The tetragonal crystals are hemihedral with parallel faces, similar to scheelite, and can appear in considerable sizes. They often occur as distinct square columns, with some showing pronounced cleavages parallel to the prism-faces. While many crystals of purple scapolite are white, greyish-white, or opaque in their raw form, top-quality specimens can display vibrant purplish hues.

Meionite specimens can appear as colorless, glassy crystals in limestone blocks at Monte Somma, Vesuvius. The hardness of scapolite ranges from 5 to 6 on the Mohs scale. Its specific gravity varies with chemical composition: approximately 2.7 for meionite and 2.5 for marialite. Purple scapolite may also show a degree of sensitivity to weathering, forming products such as mica or kaolin over time. Due to variations in composition and opacity, many local or historical varieties have been described under different names.

The gem is commonly of metamorphic origin, especially in crystalline marbles or in association with pyroxene in schists and gneisses. Long, slender prisms abundant in crystalline marbles and schists in the Pyrenees are known as dipyre (also called couzeranite). Large crystals of common scapolite (sometimes known as wernerite) are found in the apatite deposits near Bamble, close to Brevik in Norway, formed through the alteration of plagioclase in gabbroic rocks.

Four groups

Based on their genesis, scapolite rocks fall naturally into four groups:

• Limestones and contact metamorphic rocks
• Mafic igneous rocks
• Scapolite-hornblende rocks
• Metamorphic rocks of gneissose character

Purple scapolite is often prized by collectors for its distinctive color, which can range from soft lilac to deep violet. Its hue can sometimes be influenced by traces of impurities or by structural differences within the crystal lattice. Rarely, some purple varieties exhibit subtle chatoyancy (cat’s eye effect) when cut into cabochons.

Key gemological information

• Crystal Structure: Tetragonal, columnar
• Hardness: 5.5 – 6 on the Mohs scale
• Refractive Index: 1.540 – 1.579
• Density: 2.57 – 2.74
• Cleavage: Good
• Transparency: Transparent to translucent
• Double Refraction (Birefringence): -0.006 to -0.037
• Luster: Vitreous
• Fluorescence: Pink: orange, pink; Yellow: violet, blue-red

Formation and care

Purple scapolite typically forms under conditions of moderate to high-grade metamorphism, where original rock materials transform under heat and pressure. Due to its moderate hardness, it can be used in jewelry but requires mindful handling. Avoid harsh chemicals or mechanical cleaning methods that may damage the crystal. Gently wiping purple scapolite with a soft cloth and mild soap solution is generally sufficient to preserve its surface luster.

Purple Scapolite, from Afghanistan

Metaphysical perspectives (optional)

Some enthusiasts and collectors appreciate purple scapolite for its reported metaphysical attributes. While not scientifically proven, certain traditions associate purple varieties with clarity of mind, problem-solving, and emotional balance. Regardless of one’s belief in these properties, many simply enjoy the gem for its vibrant color and natural beauty.

Frequently Asked Questions

Where can the finest purple scapolite be found?

Some of the most admired purple scapolite specimens come from regions like Afghanistan and parts of East Africa. However, discoveries can occur in various metamorphic environments worldwide.

Can purple scapolite be treated or enhanced?

Certain varieties may undergo heat or other treatments to improve color or clarity. Always inquire with a trusted gemologist or reputable dealer about any potential enhancements before purchase.

How should I store my purple scapolite jewelry?

Store purple scapolite in a separate compartment or soft pouch to protect it from scratches. Prolonged exposure to direct sunlight or high heat can cause color fading, so keep it in a cool, dry place.

Is purple scapolite suitable for everyday wear?

With a Mohs hardness of 5.5 to 6, it can be worn occasionally but is more susceptible to scratching than harder gemstones. If you wish to wear purple scapolite daily, consider a protective setting and remove it during activities that might cause impact or abrasion.

What is the best cut to showcase purple scapolite’s color?

Faceted cuts such as oval, pear, and cushion shapes often highlight the stone’s color intensity and clarity. Cabochons are also popular, especially if the purple scapolite exhibits a cat’s eye effect.

Natural scapolite for sale in our gem shop

We make custom-made scapolite jewelry as engagement rings, necklaces, stud earrings, bracelets, and pendants. Please contact us for a quote if you are looking for a unique piece featuring purple scapolite or any other variety of scapolite.