*Radiance Level Disclaimer* At GeoPulse Minerals, we use our own internal classification system to evaluate the light performance of Mexican Fire Opals. This system is based exclusively on the intensity, stability and chromatic strength of the fire, play of colour, displayed by each specimen, as follows: Radiance Level I – Soft Glow Gentle internal light with delicate colour movement. Radiance Level II – Bright Glow Noticeable radiance with stable brightness and defined flashes. Radiance Level III – Intense Radiance Strong, vivid fire with powerful colour response from multiple angles. Radiance Level IV – Flame Radiance Top tier. Maximum intensity, highly saturated flame like play of colour and exceptional optical behaviour. This scale allows collectors to immediately understand the visual strength and rarity category of each opal we present. —————— Description: Despite the absence of classical iridescence, this Mexican Fire Opal stands as a profoundly rare geological specimen whose value lies not in optical play, but in its extraordinary internal architecture. Shaped into a striking natural triangular form, the stone immediately commands attention through its bold geometry, a silhouette seldom encountered in Mexican opal formations and one that gives the specimen a sculptural, almost monolithic presence. At the heart of the piece lies its defining feature: an exceptional volcanic nucleus, visually reminiscent of eruptive magma cells suspended within the body of the stone. Rather than displaying colour play, the core reveals a complex field of deep red and iron rich formations that appear as frozen lava bubbles, as if captured mid eruption from a planetary mantle. These rounded, organic structures create an illusion of movement and internal pressure, evoking the raw dynamics of volcanic genesis rather than optical reflection. This internal body is not decorative, but geological in nature, a rare preservation of eruptive processes within opaline silica. The surrounding matrix frames the nucleus with contrast and stability, enhancing its visual depth and reinforcing the impression of a contained, primordial force. The result is a specimen that tells a story of formation rather than light, of structure rather than shimmer, appealing directly to advanced collectors of volcanic minerals and uncommon opal morphologies. This is a stone defined by rarity of structure, not radiance, a quiet yet powerful testament to the diversity of Mexican fire opal expressions. Specifications: • Pattern: Volcanic nucleus with eruptive cellular formations • Colours present: Deep iron red brick red ochre cream matrix tones • Weight: 1.45 g • Carat weight: 7.25 ct • Dimensions: 23 × 14 × 3 mm • Origin: Jalisco, Mexico • Material: Natural Mexican fire opal in volcanic matrix • Radiance Level I – Soft Glow • Colour play: Absent • Transparency: Opaque to semi translucent in nucleus zones • Lustre: Waxy to matte • Treatment: None • Form: Natural triangular freeform Notable Points: • Rare natural triangular morphology with strong visual impact • Exceptionally preserved volcanic nucleus • Unique eruptive bubble like internal formations • Absence of iridescence compensated by extreme structural rarity • Visual resemblance to frozen lava activity within opaline silica • Strong geological narrative rather than optical dependence • Highly sculptural presence from all viewing angles • Natural untouched formation with no polishing or enhancement • Distinct from conventional Mexican fire opals on the market • Advanced collector specimen focused on formation rarity Collector’s Interest: This specimen is of particular interest to collectors who value geological rarity over optical brilliance. Its eruptive nucleus represents an uncommon preservation of volcanic processes within opal, offering a visual language closer to mineralogy and planetary geology than traditional gemstone aesthetics. Pieces of this nature appeal to advanced cabinets focused on formation diversity, unusual morphologies and specimens that tell a deeper story of origin and process. Lapidary Potential: Due to its unique internal structure and sculptural triangular form, this specimen is best preserved in its natural state. Any lapidary intervention would compromise the rare eruptive nucleus that defines its identity. Its highest value lies in collection, study and display as a natural geological artefact rather than as a candidate for cutting. ————— 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