**Complimentary Specimens** As a gesture of appreciation, every winning lot above €50 will include one extra mineral, added entirely free of charge. For each additional €50, another complimentary specimen will be added. —————— Description: This striking botryoidal prehnite specimen presents itself as a compact, naturally rounded formation, reminiscent of a sculpted mineral sphere shaped by slow geological rhythms rather than human intervention. Its surface is covered by countless microscopic growth layers, each one flowing concentrically around invisible nucleation points, creating a hypnotic swirling texture that reads almost like wood grain frozen in stone. Under neutral light, the specimen displays a calm, earthy green, soft yet saturated, with a matte to silky surface sheen. When exposed to direct light, however, the stone undergoes a remarkable transformation: the colour intensifies dramatically into a vivid lime green, revealing depth, internal complexity and subtle tonal variations that pulse across the botryoidal contours. This optical response enhances the sculptural nature of the piece and brings its growth structure into sharp relief. The botryoidal habit is exceptionally well developed, with smooth, uninterrupted curvature and no aggressive fractures or breaks, indicating stable crystallisation conditions during formation. The surface striations spiral gently around the mass, tracing the mineral’s incremental growth in a way that is both scientifically informative and visually captivating. This is a specimen that rewards close inspection, revealing new details with every change of angle and light. Natural, untreated and unaltered, this prehnite stands as a quiet yet powerful mineral expression, balancing geological purity with strong aesthetic presence. Its compact form and luminous green response make it equally suitable for focused mineral collections or as a distinctive standalone display piece. Specifications • Weight: 6.67 g • Weight in carats: 33.35 ct • Dimensions: 17 x 15 x 15 mm • Origin: Kayes Region, Mali • Mineral: Prehnite • Crystal habit: Botryoidal aggregate • Growth structure: Concentric radial layering • Colour: Medium green shifting to vivid lime green under direct light • Colour distribution: Even with subtle internal tonal modulation • Transparency: Opaque • Surface texture: Fine striated botryoidal curvature • Lustre: Silky to waxy • Condition: Natural, unpolished, untreated Notable Points: • Well formed botryoidal habit with rounded, uninterrupted morphology • Clearly visible concentric growth patterns radiating from central nucleation points • Swirling surface striations that trace the stone’s natural growth history • Strong colour reaction under direct illumination, shifting to intense lime green • Compact and balanced spherical form with excellent visual symmetry • Consistent surface texture across the entire specimen • Absence of major fractures or structural damage • Natural matte to silky lustre enhancing the sculptural appearance • Dense mineral body with a solid, cohesive feel • Distinctive optical depth despite opaque nature • Clean, untreated surface with no artificial enhancement • Atypical botryoidal prehnite presentation from Mali Collector’s Interest: Botryoidal prehnite specimens of this quality and cohesion are increasingly sought after by collectors who appreciate mineral growth habits as much as colour. The combination of strong spherical morphology, pronounced growth textures and vivid light response makes this piece particularly attractive within African mineral collections. Its origin in Mali adds further interest, as well formed botryoidal examples from this region are far less common than crystalline or massive prehnite varieties. Lapidary Potential: While primarily valued as a mineral specimen, this prehnite also presents interesting lapidary considerations. The dense botryoidal structure and vivid lime green colour under strong light suggest potential for experimental carving or freeform shaping, particularly for collectors or lapidaries interested in preserving natural curvature and surface texture. Any lapidary use would favour minimal intervention, allowing the natural form and growth patterns to remain the dominant visual feature. —————— Shipping and Handling: All orders are shipped by UPS express or National Express. • Dispatch time: within 1 to 2 business days after payment confirmation to Catawiki • Transit time with Express service: up to 3 business days within europe and worldwide • A tracking number is always provided Photography and transparency: All photos were taken under controlled light conditions, carefully selected to reproduce the most accurate natural colour of each specimen. No filters, colour enhancement, or artificial saturation were applied. The lighting setup uses a calibrated 5500K light source, which replicates neutral daylight and reveals the true tones and clarity of the mineral. Under weaker or more yellow indoor lighting, colours may appear slightly different, which is normal and expected. The purpose of this setup is to present each specimen exactly as it appears in balanced natural daylight, allowing buyers to appreciate its authentic colour and lustre without distortion. Identification and ethics: All specimens offered are guaranteed natural and as described. Their origin and mineral identification are provided with the most accurate and reliable information available. Every effort is made to ensure that each piece is presented with full transparency, avoiding any misleading details regarding its nature, treatment, or provenance. Customs and import taxes: Any customs duties, import fees, or local taxes applied by the destination country are entirely the responsibility of the winning bidder. These charges are not included in the auction price or shipping cost and are determined by the buyer’s local authorities. Guarantee and resolution: Customer satisfaction is a priority. In the event of any issue, such as loss, damage, or discrepancy, please contact us immediately through Catawiki’s messaging system. We will always find a fair and suitable solution, including refund, replacement, or other commercial arrangements whenever justified. Appreciation and commitment: We sincerely thank you for your trust and preference. Our goal is to continuously bring you some of the most beautiful, unique, and exceptional mineral specimens from around the world. Each piece is carefully selected for its quality and character, ensuring that every purchase meets the highest standards. Your satisfaction and confidence are our top priorities, and we will always strive to exceed your expectations with every order. With gratitude, GemPulse Minerals