Agate Slice 3-4 Inch Banded Quartz Crystal Mineral Specimen Natural
£ 19.20
AGATE SLICE (3–4") – BANDED QUARTZ MINERAL SPECIMENThis Agate Slice (3–4 inches) is a genuine banded quartz mineral specimen, cut
to reveal its natural internal structure and distinctive layered patterns. The piece has been carefully chosen for its clarity of banding, colour contrast, and overall presentation quality. The photograph shows the exact specimen you will receive. Please refer to the listing photos for full sizing and scale.This crystal is a genuine natural specimen and includes a Certificate of Authenticity lifetime guarantee generic card. MINERAL CLASSIFICATION & CRYSTAL STRUCTUREAgate is a variety of Chalcedony, which is a microcrystalline form of Quartz (Silicon Dioxide – SiO₂). It belongs to the tectosilicate mineral class and crystallises in the trigonal crystal system, though individual crystals are microscopic and intergrown.Unlike macrocrystalline quartz varieties such as Amethyst or Clear Quartz, Agate is composed of extremely fine silica fibres arranged in compact layers. This dense microcrystalline structure gives Agate its smooth finish, durability, and suitability for slicing and polishing.Agate has a Mohs hardness of approximately 6.5–7, making it relatively resistant to scratching and ideal for display specimens and decorative use. NATURAL BANDING & COLOUR CHARACTERISTICSAgate is renowned for its striking natural banding. These bands develop through rhythmic mineral deposition, forming concentric or fortification-style patterns over long geological timescales.Colour variations occur due to trace mineral inclusions such as iron oxides, manganese, and other naturally occurring elements. Depending on the specimen, tones may include:• White and cream• Grey and charcoal• Brown and earthy hues• Red or orange tones• Semi-translucent quartz zonesSome areas may allow light to pass through thinner sections, creating a subtle glow when backlit, while denser layers remain opaque. Each Agate slice is entirely unique in its pattern formation and mineral distribution. GEOLOGICAL FORMATION PROCESSAgate typically forms in volcanic rock environments, especially within basalt. During volcanic activity, gas bubbles become trapped in molten lava, creating hollow cavities known as vesicles.After cooling, silica-rich groundwater infiltrates these cavities. Over extended geological periods, successive layers of chalcedony are deposited along the cavity walls. Changes in temperature, pressure, and mineral composition result in the distinctive layered bands.In some specimens, the central cavity may contain crystalline quartz (drusy quartz), though many slices are fully solid with concentric layering. CUT & DISPLAY PRESENTATIONThis Agate has been sliced to reveal its internal structure, then polished on the flat surfaces to enhance the visibility of its natural banding. The outer edge may retain a more natural contour, reflecting the original nodule shape.Agate slices are popular as:• Mineral and crystal display pieces• Educational geological specimens• Decorative home or office accents• Unique collector’s quartz varieties• Thoughtful natural giftsAgate has been traditionally associated with grounding and balance in spiritual contexts. These interpretations are symbolic and cultural in nature. AUTHENTICITY & INDIVIDUAL SELECTION• Genuine Agate (Chalcedony – Quartz SiO₂)• Mineral class: Tectosilicate• Microcrystalline quartz composition• Natural banded formation• Approximate size: 3–4 inches• Exact specimen shown in photographs• Includes Certificate of Authenticity lifetime guarantee generic cardFormed through volcanic processes over millions of years, this Agate slice represents a natural example of banded silica mineralisation and makes a distinctive addition to any mineral collection or display.
to reveal its natural internal structure and distinctive layered patterns. The piece has been carefully chosen for its clarity of banding, colour contrast, and overall presentation quality. The photograph shows the exact specimen you will receive. Please refer to the listing photos for full sizing and scale.This crystal is a genuine natural specimen and includes a Certificate of Authenticity lifetime guarantee generic card. MINERAL CLASSIFICATION & CRYSTAL STRUCTUREAgate is a variety of Chalcedony, which is a microcrystalline form of Quartz (Silicon Dioxide – SiO₂). It belongs to the tectosilicate mineral class and crystallises in the trigonal crystal system, though individual crystals are microscopic and intergrown.Unlike macrocrystalline quartz varieties such as Amethyst or Clear Quartz, Agate is composed of extremely fine silica fibres arranged in compact layers. This dense microcrystalline structure gives Agate its smooth finish, durability, and suitability for slicing and polishing.Agate has a Mohs hardness of approximately 6.5–7, making it relatively resistant to scratching and ideal for display specimens and decorative use. NATURAL BANDING & COLOUR CHARACTERISTICSAgate is renowned for its striking natural banding. These bands develop through rhythmic mineral deposition, forming concentric or fortification-style patterns over long geological timescales.Colour variations occur due to trace mineral inclusions such as iron oxides, manganese, and other naturally occurring elements. Depending on the specimen, tones may include:• White and cream• Grey and charcoal• Brown and earthy hues• Red or orange tones• Semi-translucent quartz zonesSome areas may allow light to pass through thinner sections, creating a subtle glow when backlit, while denser layers remain opaque. Each Agate slice is entirely unique in its pattern formation and mineral distribution. GEOLOGICAL FORMATION PROCESSAgate typically forms in volcanic rock environments, especially within basalt. During volcanic activity, gas bubbles become trapped in molten lava, creating hollow cavities known as vesicles.After cooling, silica-rich groundwater infiltrates these cavities. Over extended geological periods, successive layers of chalcedony are deposited along the cavity walls. Changes in temperature, pressure, and mineral composition result in the distinctive layered bands.In some specimens, the central cavity may contain crystalline quartz (drusy quartz), though many slices are fully solid with concentric layering. CUT & DISPLAY PRESENTATIONThis Agate has been sliced to reveal its internal structure, then polished on the flat surfaces to enhance the visibility of its natural banding. The outer edge may retain a more natural contour, reflecting the original nodule shape.Agate slices are popular as:• Mineral and crystal display pieces• Educational geological specimens• Decorative home or office accents• Unique collector’s quartz varieties• Thoughtful natural giftsAgate has been traditionally associated with grounding and balance in spiritual contexts. These interpretations are symbolic and cultural in nature. AUTHENTICITY & INDIVIDUAL SELECTION• Genuine Agate (Chalcedony – Quartz SiO₂)• Mineral class: Tectosilicate• Microcrystalline quartz composition• Natural banded formation• Approximate size: 3–4 inches• Exact specimen shown in photographs• Includes Certificate of Authenticity lifetime guarantee generic cardFormed through volcanic processes over millions of years, this Agate slice represents a natural example of banded silica mineralisation and makes a distinctive addition to any mineral collection or display.
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