Description
Large Agate Slice – 5.5 Inch Natural Banded Quartz Specimen
This genuine 5.5 inch Agate Slice is a striking large-format natural quartz specimen, carefully cut and polished to reveal its intricate banding and internal structure. With its substantial size and beautifully layered patterns, this piece is ideal for collectors, display enthusiasts, and anyone who appreciates the artistry of natural geological formations.
The photograph shows the exact specimen you will receive. Each slice is individually selected for pattern clarity, colour contrast, and overall presentation. Please refer to the listing images for full sizing and scale confirmation.
This crystal is a genuine specimen and includes a Certificate of Authenticity lifetime guarantee generic card.
Mineral Type & Scientific Classification
Agate is a variety of chalcedony, a microcrystalline form of quartz composed primarily of silicon dioxide (SiO₂). It belongs to the trigonal crystal system, though the crystals are microscopic and intergrown in fibrous layers.
Key mineral properties include:
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Mineral Group: Quartz
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Variety: Chalcedony (Agate)
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Chemical Formula: SiO₂
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Crystal System: Trigonal
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Hardness: 6.5–7 on the Mohs scale
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Lustre: Waxy to vitreous
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Transparency: Opaque to translucent at thinner edges
Agate is known for its distinctive banding, formed through rhythmic silica deposition within cavities of volcanic rocks. These bands may appear concentric, lace-like, or linear depending on growth conditions.
Geological Formation & Structure
Agate forms in vesicles and fractures within volcanic rocks such as basalt. When silica-rich groundwater circulates through these cavities, it deposits successive layers of chalcedony over extended geological time periods.
Variations in trace elements and mineral inclusions during growth produce the different colour bands seen in agate. Common natural tones include white, grey, brown, red, orange, and occasionally subtle blue or green hues.
In some agate slices, the centre may contain a druzy quartz pocket where larger quartz crystals formed in the final stages of cavity filling. These crystalline interiors contrast beautifully with the surrounding layered chalcedony.
Large 5.5 Inch Slice – Display Features
At approximately 5.5 inches across, this agate slice offers a substantial display presence. Features may include:
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Bold natural banding patterns
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Smooth polished faces enhancing colour contrast
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Semi-translucent outer zones
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Possible quartz crystal centre
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Natural edge contour reflecting original geode shape
The polished finish enhances the natural structure while preserving the authenticity of the stone. The slice can be displayed upright with a stand, laid flat, or used as a decorative centrepiece.
Due to its size, this specimen makes a particularly eye-catching addition to any collection.
Collecting, Decorative & Gift Appeal
Large agate slices are popular for:
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Mineral and crystal collections
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Decorative home or office displays
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Geological teaching specimens
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Photography styling
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Unique and meaningful gifts
Agate is traditionally associated in spiritual contexts with balance and grounding, though this listing focuses entirely on its geological and collectible value.
The durability of quartz ensures this piece is long-lasting and suitable for display in a variety of settings.
Authenticity & Certificate Included
This is a genuine natural agate chalcedony quartz specimen. The photograph shows the exact 5.5 inch slice you will receive, carefully chosen for quality and visual appeal.
Your purchase includes a Certificate of Authenticity lifetime guarantee generic card. Please refer to the listing photographs for full sizing details.
A substantial and beautifully banded quartz specimen, this large agate slice offers timeless geological beauty and makes a standout addition to any mineral collection or display space.
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