GYPSUM "SWORD" – Giant Natural Swallow-Tail Crystal (54.5 cm), Italy

Outstanding natural Gypsum "Sword" crystal from the historic Fiorini Quarry, San Lazzaro di Savena, Bologna, Emilia-Romagna, Italy. This remarkable specimen consists of a single, completely natural crystal measuring more than 54 cm in length, making it an exceptional collector's piece. It exhibits the classic swallow-tail crystal habit that characterizes the finest gypsum crystals, together with excellent transparency, outstanding vitreous luster and a beautiful golden-yellow coloration. Internal crystallization patterns create fascinating geometric structures visible within the crystal, further enhancing its aesthetic appeal. Collected during the 1960s, this historic specimen combines rarity, unusual provenance and significant historical interest, making it ideal for museum-quality mineral collections and prestigious interior displays.

Gypsum is a hydrated calcium sulfate mineral with the chemical formula CaSO₄·2H₂O. It belongs to the sulfate mineral class and crystallizes in the monoclinic crystal system. Gypsum commonly forms through the evaporation of sulfate-rich waters and can also develop in hydrothermal and sedimentary environments. The characteristic swallow-tail habit is produced by repeated twinning during crystal growth and is considered one of the most recognizable crystal forms of gypsum. Transparent golden crystals such as this specimen are particularly prized by collectors due to their rarity, crystal quality and exceptional aesthetic appearance.

• Chemical formula: CaSO₄·2H₂O
• Mineral class: Sulfates
• Crystal system: Monoclinic
• Formation: Evaporitic sedimentary deposits and hydrothermal environments
• Key elements: Calcium (Ca), Sulfur (S), Oxygen (O), Hydrogen (H)
• Crystal habit: Swallow-tail twin, elongated blade, sword-shaped crystal
• Color: Golden yellow, honey yellow, transparent

The famous "swallow-tail" habit of gypsum is produced by contact twinning, where two crystals grow together at a characteristic angle resembling the open wings of a swallow. Large transparent crystals with this habit are highly sought after by collectors worldwide.

Gypsum is traditionally associated with purification, emotional balance and inner peace in crystal healing practices. It is believed to promote mental clarity, reduce emotional stress and encourage relaxation. Many practitioners use gypsum as a symbolic stone for cleansing environments of negative energy while supporting meditation and spiritual growth. Transparent golden varieties are also associated with optimism, confidence and emotional renewal, making them popular for both decorative and crystal healing purposes.

Photos: All photographs are taken under professional lighting conditions to accurately highlight crystal structure, color and detail. However, slight variations in tone and appearance may occur depending on screen calibration and ambient lighting conditions.

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Multiple purchases can be consolidated into a single shipment, including items from different auctions or separate orders, by simply contacting us to arrange combined shipping. For high-value specimens, direct delivery by appointment is also available, either at home or at major European mineral shows and fairs.