A Grade Sapphire Crystal Madagascar Natural Blue Corundum Mineral Specimen 4-20mm Genuine Collector Display Stone with Certificate
£ 10.80
A GRADE SAPPHIRE CRYSTAL – NATURAL MADAGASCAN CORUNDUMThis A-grade Sapphire crystal from Madagascar is a genuine natural corundum
mineral specimen, carefully selected for its colour quality, structure, and overall presentation. Each piece measures approximately 4–20mm, making it ideal for collectors, gemstone enthusiasts, and compact mineral displays. The photograph shows an example of the actual specimen you will receive. Please refer to the listing images for full sizing and expected variation within this range.Your Sapphire includes a Certificate of Authenticity lifetime guarantee generic card, confirming it is a 100% genuine natural mineral specimen. MINERAL SPECIES & CHEMICAL COMPOSITIONSapphire is the blue variety of Corundum, composed of aluminium oxide with the chemical formula Al₂O₃. It belongs to the oxide mineral group and crystallises in the trigonal crystal system.The characteristic blue colour in Sapphire is primarily caused by trace amounts of iron and titanium within the crystal lattice. Variations in these trace elements influence tone and saturation, resulting in shades that can range from lighter blue to deeper royal hues.Corundum ranks 9 on the Mohs hardness scale, making Sapphire one of the hardest naturally occurring minerals. This exceptional hardness contributes to its durability and its longstanding status as one of the most important gemstone minerals in the world. GEOLOGICAL FORMATION – MADAGASCARMadagascar is internationally recognised for its rich corundum deposits and has become one of the leading sources of high-quality Sapphire. These crystals typically form in high-grade metamorphic environments where aluminium-rich rocks undergo intense heat and pressure.In marble-hosted or metamorphic deposits, corundum develops during recrystallisation processes deep within the Earth’s crust. When iron and titanium are present during formation, the resulting corundum displays the blue coloration associated with Sapphire.Madagascan Sapphire is especially valued for its vibrant natural colour and well-defined crystal fragments. Associated minerals may include calcite, feldspar, mica, spinel, and amphibole depending on the geological setting. CRYSTAL HABIT, COLOUR & PHYSICAL PROPERTIESThese A-grade Sapphire specimens display natural crystal sections or fragments that reflect corundum’s trigonal growth habit. In some pieces, partial hexagonal cross-sections may be visible, characteristic of corundum’s crystal structure.Key mineralogical properties include:
• Mineral Group: Oxide
• Species: Corundum (Sapphire variety)
• Chemical Formula: Al₂O₃
• Crystal System: Trigonal
• Colour: Blue in varying natural shades
• Lustre: Vitreous to subadamantine
• Transparency: Transparent to opaque depending on specimen
• Hardness: 9 MohsNatural inclusions, growth zoning, and surface textures are common in authentic Sapphire and reflect its geological origin. These specimens have not been artificially dyed or treated. COLLECTING, DISPLAY & EDUCATIONAL VALUEA-grade Sapphire crystals in the 4–20mm size range are ideal for mineral collectors seeking natural corundum specimens with strong colour presence. Their compact size makes them suitable for display trays, mineral boxes, gemstone study collections, or curated assortments.Sapphire has been traditionally associated in spiritual practices with wisdom and focus; these associations are cultural rather than scientific.Due to its exceptional hardness, vibrant natural colour, and historical significance, Sapphire remains one of the most recognisable and respected mineral species worldwide. Madagascan material continues to be highly regarded among collectors for its quality and locality reputation. AUTHENTICITY & INDIVIDUAL SELECTIONEach A-grade Sapphire crystal is a carefully chosen genuine specimen. The listing photograph shows an example of the actual piece you will receive within the stated 4–20mm size range. Please review the images for scale and expected natural variation.Every specimen is supplied with a Certificate of Authenticity lifetime guarantee generic card, confirming its genuine natural origin.A classic example of Madagascan corundum, this A-grade Sapphire crystal represents the remarkable geological forces of metamorphism and offers a compact yet highly collectible addition to any serious mineral collection.
mineral specimen, carefully selected for its colour quality, structure, and overall presentation. Each piece measures approximately 4–20mm, making it ideal for collectors, gemstone enthusiasts, and compact mineral displays. The photograph shows an example of the actual specimen you will receive. Please refer to the listing images for full sizing and expected variation within this range.Your Sapphire includes a Certificate of Authenticity lifetime guarantee generic card, confirming it is a 100% genuine natural mineral specimen. MINERAL SPECIES & CHEMICAL COMPOSITIONSapphire is the blue variety of Corundum, composed of aluminium oxide with the chemical formula Al₂O₃. It belongs to the oxide mineral group and crystallises in the trigonal crystal system.The characteristic blue colour in Sapphire is primarily caused by trace amounts of iron and titanium within the crystal lattice. Variations in these trace elements influence tone and saturation, resulting in shades that can range from lighter blue to deeper royal hues.Corundum ranks 9 on the Mohs hardness scale, making Sapphire one of the hardest naturally occurring minerals. This exceptional hardness contributes to its durability and its longstanding status as one of the most important gemstone minerals in the world. GEOLOGICAL FORMATION – MADAGASCARMadagascar is internationally recognised for its rich corundum deposits and has become one of the leading sources of high-quality Sapphire. These crystals typically form in high-grade metamorphic environments where aluminium-rich rocks undergo intense heat and pressure.In marble-hosted or metamorphic deposits, corundum develops during recrystallisation processes deep within the Earth’s crust. When iron and titanium are present during formation, the resulting corundum displays the blue coloration associated with Sapphire.Madagascan Sapphire is especially valued for its vibrant natural colour and well-defined crystal fragments. Associated minerals may include calcite, feldspar, mica, spinel, and amphibole depending on the geological setting. CRYSTAL HABIT, COLOUR & PHYSICAL PROPERTIESThese A-grade Sapphire specimens display natural crystal sections or fragments that reflect corundum’s trigonal growth habit. In some pieces, partial hexagonal cross-sections may be visible, characteristic of corundum’s crystal structure.Key mineralogical properties include:
• Mineral Group: Oxide
• Species: Corundum (Sapphire variety)
• Chemical Formula: Al₂O₃
• Crystal System: Trigonal
• Colour: Blue in varying natural shades
• Lustre: Vitreous to subadamantine
• Transparency: Transparent to opaque depending on specimen
• Hardness: 9 MohsNatural inclusions, growth zoning, and surface textures are common in authentic Sapphire and reflect its geological origin. These specimens have not been artificially dyed or treated. COLLECTING, DISPLAY & EDUCATIONAL VALUEA-grade Sapphire crystals in the 4–20mm size range are ideal for mineral collectors seeking natural corundum specimens with strong colour presence. Their compact size makes them suitable for display trays, mineral boxes, gemstone study collections, or curated assortments.Sapphire has been traditionally associated in spiritual practices with wisdom and focus; these associations are cultural rather than scientific.Due to its exceptional hardness, vibrant natural colour, and historical significance, Sapphire remains one of the most recognisable and respected mineral species worldwide. Madagascan material continues to be highly regarded among collectors for its quality and locality reputation. AUTHENTICITY & INDIVIDUAL SELECTIONEach A-grade Sapphire crystal is a carefully chosen genuine specimen. The listing photograph shows an example of the actual piece you will receive within the stated 4–20mm size range. Please review the images for scale and expected natural variation.Every specimen is supplied with a Certificate of Authenticity lifetime guarantee generic card, confirming its genuine natural origin.A classic example of Madagascan corundum, this A-grade Sapphire crystal represents the remarkable geological forces of metamorphism and offers a compact yet highly collectible addition to any serious mineral collection.
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