**Complimentary Specimens** As a gesture of appreciation, winning lots with a final hammer price above €50 will include one small additional mineral offered entirely free of charge. —————— Description: Like a cathedral carved from solid sunlight and assembled by invisible geometric hands, this extraordinary yellow fluorite from Moscona Mine rises in perfect cubic harmony, each crystal interlocking with the next as if architectural intent guided its growth deep within the limestone veins of Asturias. Its presence is immediately luminous. The yellow is not flat nor superficial. It carries depth, shifting between vibrant lemon, molten gold and warm honey tones depending on light direction and intensity. Under frontal lighting the surfaces gleam with a crisp vitreous brilliance. Under transmitted light the interior ignites, revealing a crystalline framework so precise that each cube becomes a window into the next, creating a layered architectural transparency rarely encountered in European material. The cubic geometry is exceptionally readable. Well defined faces meet at confident right angles, forming a structured cluster where primary cubes anchor the composition while secondary crystals emerge in stepped, interlocking arrangements. This escalonated growth gives the specimen a sense of motion and spatial rhythm, transforming static geometry into visual dynamism. The cubes are not randomly aggregated; they are harmonised, balanced and volumetrically coherent. Internally, the fluorite displays impressive clarity for yellow Asturian material. Light penetrates readily, illuminating subtle internal growth planes and delicate inclusions that confirm its untreated, natural state. The colour remains stable and saturated even in thicker sections, demonstrating strong chromatic integrity rather than superficial staining. Under ultraviolet light, the specimen exhibits a distinct fluorescence characteristic of Moscona fluorite. A cool bluish to violet luminescent response overlays the yellow body, creating a striking optical contrast. This fluorescence is caused by structural activators and lattice defects typical of Asturian deposits, and significantly enhances collector interest. The transformation under UV reinforces the mineral’s dual personality: radiant in daylight, electrically alive under ultraviolet excitation. The surface retains a bright vitreous lustre across preserved cubic faces, reflecting light sharply and cleanly. Minor natural edge micro irregularities confirm authenticity and extraction origin, without compromising structural definition. A small residual calcitic matrix at the base anchors the specimen in its geological context, reminding the viewer that this geometry was born within carbonate host rock rather than shaped by human intervention. Moscona Mine is internationally recognised for producing some of Europe’s finest cubic fluorites. While violet varieties dominate the region’s fame, high quality yellow examples with strong transparency and architectural clarity are far less common. This piece embodies the precision, luminosity and structural authority that define the best Asturian material. This is not merely a yellow fluorite cluster. It is geometric light crystallised. Specifications: • Weight: 5.31 g • Weight in carats: 26.55 ct • Dimensions: 23 × 19 × 12 mm • Origin: Moscona Mine, El Pontón de Solís, Asturias, Spain • Mineral species: Fluorite • Crystal system: Isometric • Crystal habit: Interlocking cubic cluster with stepped growth • Colour: Intense yellow ranging from lemon to golden honey • Colour distribution: Homogeneous with subtle internal zoning • Transparency: Transparent to translucent • Fluorescence: Visible bluish to violet response under UV light • Lustre: Vitreous • Matrix: Minor calcitic matrix at base • Condition: Natural, unpolished, untreated Notable Points: • Classic Moscona Mine fluorite from one of Europe’s most respected localities • Strong cubic architecture with sharply readable right angle geometry • Interlocking stepped growth creating structural depth and balance • Saturated yellow colour with excellent chromatic stability • Significant light transmission enhancing internal cubic visibility • Fluorescent response under ultraviolet light adding optical interest • High vitreous lustre across preserved crystal faces • Compact but visually powerful three dimensional presence • Internal growth features confirming natural crystallisation • Minor matrix attachment anchoring geological authenticity • Less common yellow variety from a region better known for violet fluorite • Completely natural specimen with no treatment or polishing Collector’s Interest: For collectors of classic European mineralogy, Moscona fluorite occupies a privileged position. Yellow examples with this level of transparency, structural clarity and fluorescence are distinctly less common than the well known purple material from the same district. The combination of luminous colour, readable cubic symmetry and strong optical behaviour under varying light conditions gives this specimen both aesthetic authority and geological credibility. Its appeal lies not in size alone, but in balance, architecture and light interaction. It is a refined representation of Asturian fluorite at its most geometric and most radiant. Lapidary Potential: While certain areas display sufficient transparency for theoretical lapidary exploration, any intervention would irreversibly disrupt the interlocking cubic architecture that defines this specimen’s identity. Its highest value resides in preservation. As an intact natural crystal cluster, it expresses both structural precision and optical dynamism in a way that cut material could never replicate. ————— Shipping and Handling: All orders are shipped by Portuguese National Post. • Dispatch time: within 1 to 3 business days after payment confirmation to Catawiki • Transit time with CTT service: between 5 to 7 business days within europe and worldwide, depending on destination national post. • A tracking number is always provided Photography and transparency: All photographs are taken under controlled lighting conditions using a macro lens, carefully selected to present each specimen as accurately as possible. No filters, colour enhancement, or artificial saturation are applied. The lighting setup uses a calibrated 5500K light source, replicating neutral daylight to reveal natural tones, surface features, and internal characteristics. Under warmer or weaker indoor lighting, colours may appear slightly different, which is normal. The purpose of this photographic process is documentation and representation, not visual enhancement. Images are intended to reflect the specimen faithfully as it appears under balanced natural light conditions. Identification and ethics: All specimens offered are natural and described to the best of our knowledge, based on direct sourcing, professional experience, and information provided by trusted suppliers working at the origin. Every effort is made to ensure transparency and accuracy regarding identification, locality, and general characteristics, avoiding misleading statements about treatment, provenance, or nature. 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 important. In the unlikely event of an issue such as loss, damage, or discrepancy, please contact us promptly through Catawiki’s messaging system. Each case is handled individually and fairly, with appropriate solutions offered when justified. Appreciation and commitment: We sincerely thank you for your trust. Our work focuses on careful selection, accurate representation, and respectful presentation of mineral specimens with character and interest. Each piece is chosen for its individual qualities rather than speculative or financial considerations. We aim to provide a transparent, reliable, and consistent experience for collectors at all levels. With gratitude, GemPulse Minerals