Mordenite Crystal Mineral Specimen Natural Cluster Display Stone 35-70mm
£ 8.76
GENUINE MORDENITE MINERAL SPECIMENThis listing is for a genuine Mordenite mineral specimen, a naturally occurring
crystal prized by collectors for its delicate fibrous formations and geological interest. The specimen size ranges approximately 35–70mm. The photograph shown represents an example of the actual piece you will receive, and each specimen is carefully chosen for its crystal texture, structure, and display quality.Your mineral includes a Certificate of Authenticity lifetime guarantee generic card, confirming it is a genuine natural specimen. Full sizing and scale can be seen clearly in the photographs. MINERAL SPECIES & SCIENTIFIC CLASSIFICATIONKey mineral information:
• Mineral Species: Mordenite
• Chemical Formula: (Na,K,Ca)Al₂Si₁₀O₂₄·7H₂O
• Crystal System: Orthorhombic
• Hardness: 3–4 on the Mohs scale
• Lustre: Vitreous to silky
• Transparency: Translucent to opaque
• Typical Colour: White, cream, pale beige, sometimes with grey tonesMordenite commonly forms in fibrous or needle-like crystal aggregates, giving specimens an attractive soft crystalline appearance. GEOLOGICAL FORMATIONMordenite forms primarily in volcanic settings where silica-rich fluids interact with basaltic rocks over time. It develops as a secondary mineral in cavities, fractures, and vesicles within volcanic lava flows.Typical formation environments include:
• Basaltic lava cavities
• Hydrothermal alteration zones
• Volcanic tuffs and ash deposits
• Low-grade metamorphic settingsAs hot mineral-rich fluids circulate through volcanic rock, they deposit minerals such as mordenite, often alongside other secondary silicates.Associated minerals may include:
• Stilbite
• Heulandite
• Calcite
• Quartz
• ApophylliteCRYSTAL HABIT & NATURAL APPEARANCEMordenite is valued for its distinctive crystal textures, often appearing as:
• Fine fibrous sprays
• Needle-like crystal bundles
• Radiating crystal clusters
• Soft white to cream mineral coatingsSpecimens may show a silky sheen when light reflects off the fibrous crystal surfaces. Natural variations in texture and density are expected and confirm the authenticity of the mineral’s formation.Each piece is completely natural and untreated, preserving its delicate crystalline structure. SIZE & DISPLAY APPEAL (35–70MM)With a size range of approximately 35–70mm, this mordenite specimen is an excellent display size for:
• Mineral collections
• Cabinet specimen arrangements
• Educational geology displays
• Volcanic mineral study sets
• Unique gifts for collectorsIts larger size allows the fibrous crystal habit to be appreciated clearly, making it a standout specimen. AUTHENTICITY & PRODUCT DETAILS
• Genuine Mordenite mineral specimen
• Size Range: Approximately 35–70mm
• Carefully selected collector piece
• Includes Certificate of Authenticity lifetime guarantee generic card
• Photo shows an example of the actual specimen you will receive
crystal prized by collectors for its delicate fibrous formations and geological interest. The specimen size ranges approximately 35–70mm. The photograph shown represents an example of the actual piece you will receive, and each specimen is carefully chosen for its crystal texture, structure, and display quality.Your mineral includes a Certificate of Authenticity lifetime guarantee generic card, confirming it is a genuine natural specimen. Full sizing and scale can be seen clearly in the photographs. MINERAL SPECIES & SCIENTIFIC CLASSIFICATIONKey mineral information:
• Mineral Species: Mordenite
• Chemical Formula: (Na,K,Ca)Al₂Si₁₀O₂₄·7H₂O
• Crystal System: Orthorhombic
• Hardness: 3–4 on the Mohs scale
• Lustre: Vitreous to silky
• Transparency: Translucent to opaque
• Typical Colour: White, cream, pale beige, sometimes with grey tonesMordenite commonly forms in fibrous or needle-like crystal aggregates, giving specimens an attractive soft crystalline appearance. GEOLOGICAL FORMATIONMordenite forms primarily in volcanic settings where silica-rich fluids interact with basaltic rocks over time. It develops as a secondary mineral in cavities, fractures, and vesicles within volcanic lava flows.Typical formation environments include:
• Basaltic lava cavities
• Hydrothermal alteration zones
• Volcanic tuffs and ash deposits
• Low-grade metamorphic settingsAs hot mineral-rich fluids circulate through volcanic rock, they deposit minerals such as mordenite, often alongside other secondary silicates.Associated minerals may include:
• Stilbite
• Heulandite
• Calcite
• Quartz
• ApophylliteCRYSTAL HABIT & NATURAL APPEARANCEMordenite is valued for its distinctive crystal textures, often appearing as:
• Fine fibrous sprays
• Needle-like crystal bundles
• Radiating crystal clusters
• Soft white to cream mineral coatingsSpecimens may show a silky sheen when light reflects off the fibrous crystal surfaces. Natural variations in texture and density are expected and confirm the authenticity of the mineral’s formation.Each piece is completely natural and untreated, preserving its delicate crystalline structure. SIZE & DISPLAY APPEAL (35–70MM)With a size range of approximately 35–70mm, this mordenite specimen is an excellent display size for:
• Mineral collections
• Cabinet specimen arrangements
• Educational geology displays
• Volcanic mineral study sets
• Unique gifts for collectorsIts larger size allows the fibrous crystal habit to be appreciated clearly, making it a standout specimen. AUTHENTICITY & PRODUCT DETAILS
• Genuine Mordenite mineral specimen
• Size Range: Approximately 35–70mm
• Carefully selected collector piece
• Includes Certificate of Authenticity lifetime guarantee generic card
• Photo shows an example of the actual specimen you will receive
