Mahogany Obsidian Utah USA Natural Volcanic Glass Mineral Specimen Collectors Display Piece with Certificate of Authenticity
£ 12.60
Mahogany Obsidian – Natural Volcanic Glass from Utah, USAThis striking Mahogany Obsidian specimen from Utah, USA, is a carefully selected
example of natural volcanic glass, known for its rich colour contrast and smooth, glassy appearance. Featuring deep black tones interwoven with warm reddish-brown patches, this specimen displays the classic “mahogany” pattern that gives the material its name. Its bold, natural colouring and polished-like surface make it an eye-catching addition to any mineral collection or display.Mineral Type and CompositionObsidian is not a true crystalline mineral but a naturally occurring volcanic glass formed from rapidly cooled felsic lava. Its composition is primarily silica (SiO₂), similar to quartz, but due to the rapid cooling process, it lacks an ordered crystal structure. Mahogany Obsidian specifically contains iron-rich inclusions, which create the characteristic reddish-brown patches within the otherwise black glassy matrix.Formation and Geological OriginMahogany Obsidian forms during volcanic activity when molten lava cools so quickly that atoms do not have time to arrange into a crystalline structure. This rapid quenching typically occurs at or near the Earth’s surface, often in volcanic flows or domes. The Utah region is well known for its volcanic history, producing high-quality obsidian with distinctive colour variations. The presence of iron within the lava contributes to the mahogany-like patterns seen in this specimen, providing a direct visual record of the chemical composition during formation.Appearance and Surface CharacteristicsThis specimen exhibits a smooth, glassy lustre typical of obsidian, often with naturally curved fracture surfaces known as conchoidal fractures. The interplay of deep black and reddish-brown tones creates a marbled or patchy effect, with each piece displaying its own unique pattern. Depending on the light, the surface may show subtle reflections, enhancing its visual depth and contrast. Natural edges may appear sharp or slightly irregular, reflecting its volcanic origin.Structure and Physical PropertiesUnlike crystalline minerals, obsidian has an amorphous structure, meaning it lacks a defined crystal habit. Its texture is typically dense and homogeneous, though the presence of mineral inclusions can create variations in colour and pattern. Mahogany Obsidian is valued for its durability and smooth finish, making it both a collectible mineral specimen and a visually appealing natural object.Collecting and Display AppealThis specimen is ideal for display in a mineral cabinet, on a desk, or as part of a broader collection of volcanic materials. Its natural colour contrast makes it equally suitable as a decorative piece, adding depth and interest to any interior setting. Each piece is unique, ensuring that no two specimens are exactly alike.Authenticity and GuaranteeThis crystal is a genuine natural specimen and includes a Certificate of Authenticity lifetime guarantee card, offering assurance of its origin and classification. The photograph provided shows the exact specimen you will receive, ensuring transparency and confidence in your purchase.Size and Natural ConditionPlease refer to the photo for full sizing and scale. As a natural volcanic glass, minor surface irregularities, fractures, and variations in pattern are expected and enhance the individuality and authenticity of the specimen.
example of natural volcanic glass, known for its rich colour contrast and smooth, glassy appearance. Featuring deep black tones interwoven with warm reddish-brown patches, this specimen displays the classic “mahogany” pattern that gives the material its name. Its bold, natural colouring and polished-like surface make it an eye-catching addition to any mineral collection or display.Mineral Type and CompositionObsidian is not a true crystalline mineral but a naturally occurring volcanic glass formed from rapidly cooled felsic lava. Its composition is primarily silica (SiO₂), similar to quartz, but due to the rapid cooling process, it lacks an ordered crystal structure. Mahogany Obsidian specifically contains iron-rich inclusions, which create the characteristic reddish-brown patches within the otherwise black glassy matrix.Formation and Geological OriginMahogany Obsidian forms during volcanic activity when molten lava cools so quickly that atoms do not have time to arrange into a crystalline structure. This rapid quenching typically occurs at or near the Earth’s surface, often in volcanic flows or domes. The Utah region is well known for its volcanic history, producing high-quality obsidian with distinctive colour variations. The presence of iron within the lava contributes to the mahogany-like patterns seen in this specimen, providing a direct visual record of the chemical composition during formation.Appearance and Surface CharacteristicsThis specimen exhibits a smooth, glassy lustre typical of obsidian, often with naturally curved fracture surfaces known as conchoidal fractures. The interplay of deep black and reddish-brown tones creates a marbled or patchy effect, with each piece displaying its own unique pattern. Depending on the light, the surface may show subtle reflections, enhancing its visual depth and contrast. Natural edges may appear sharp or slightly irregular, reflecting its volcanic origin.Structure and Physical PropertiesUnlike crystalline minerals, obsidian has an amorphous structure, meaning it lacks a defined crystal habit. Its texture is typically dense and homogeneous, though the presence of mineral inclusions can create variations in colour and pattern. Mahogany Obsidian is valued for its durability and smooth finish, making it both a collectible mineral specimen and a visually appealing natural object.Collecting and Display AppealThis specimen is ideal for display in a mineral cabinet, on a desk, or as part of a broader collection of volcanic materials. Its natural colour contrast makes it equally suitable as a decorative piece, adding depth and interest to any interior setting. Each piece is unique, ensuring that no two specimens are exactly alike.Authenticity and GuaranteeThis crystal is a genuine natural specimen and includes a Certificate of Authenticity lifetime guarantee card, offering assurance of its origin and classification. The photograph provided shows the exact specimen you will receive, ensuring transparency and confidence in your purchase.Size and Natural ConditionPlease refer to the photo for full sizing and scale. As a natural volcanic glass, minor surface irregularities, fractures, and variations in pattern are expected and enhance the individuality and authenticity of the specimen.
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