Description
Black Agate Terminated Pencil – Genuine Chalcedony Quartz Specimen
This genuine Black Agate terminated pencil crystal is a beautifully polished mineral specimen crafted from natural banded chalcedony, a microcrystalline variety of quartz. Shaped into a classic six-sided pencil with a pointed termination, this piece highlights the deep black tones and subtle natural patterning that make agate a timeless collector’s stone.
The photograph shows the exact specimen you will receive. Each piece is carefully chosen for its colour depth, polish quality, and overall display appeal. Full sizing can be confirmed in the listing photographs.
This crystal is a genuine specimen and includes a Certificate of Authenticity lifetime guarantee generic card.
Mineral Type & Scientific Classification
Black Agate is a variety of chalcedony, which itself is a cryptocrystalline form of quartz composed primarily of silicon dioxide (SiO₂). It belongs to the trigonal crystal system, though individual crystals are microscopic and intergrown in fibrous layers.
Key mineral details 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 slightly translucent at edges
Agate is characterised by its layered banding formed through rhythmic silica deposition within cavities of volcanic rock. Black agate displays deep charcoal to jet-black tones, sometimes with subtle grey or white banding depending on the specimen.
Geological Formation of Agate
Agate forms in volcanic environments where silica-rich groundwater fills cavities, vesicles, or cracks within basalt and other igneous rocks. Over long geological periods, successive layers of silica precipitate from solution, creating concentric bands and layered structures.
The dark colouration in black agate may result from natural mineral inclusions or trace elements incorporated during formation. Some black agates on the market are enhanced through dyeing; however, this specimen is a genuine natural stone selected for its authentic mineral character.
The dense quartz structure gives agate its durability and suitability for carving and polishing.
Terminated Pencil Shape & Finish
This specimen has been precision-polished into a terminated pencil form featuring:
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Six smooth polished sides
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A symmetrical pointed termination
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Deep black colour with potential subtle banding
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Smooth surface finish enhancing natural lustre
The geometric pencil shape enhances the clean, modern aesthetic of the stone while maintaining its natural mineral integrity. The pointed termination reflects the traditional crystal point style commonly used for display or spiritual practices (belief-based use only).
Each terminated pencil is unique due to natural variations in internal banding and colour distribution.
Display, Collecting & Gift Appeal
Black Agate terminated pencils are ideal for:
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Mineral and crystal collections
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Decorative desk or shelf displays
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Modern home decor
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Unique gift ideas
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Spiritual practices where agate is traditionally associated with grounding and balance
Any spiritual associations are presented neutrally and are not medical claims.
With a Mohs hardness of up to 7, agate is a durable quartz variety suitable for long-term display and handling.
Authenticity & Certificate Included
This is a genuine Black Agate chalcedony quartz specimen, carefully shaped and polished into a terminated pencil point. The photograph shows the exact piece you will receive.
Your purchase includes a Certificate of Authenticity lifetime guarantee generic card. Please refer to the listing photographs for full sizing and scale.
A sleek and striking polished quartz variety, this Black Agate terminated pencil crystal offers natural geological beauty combined with elegant craftsmanship for collectors and display enthusiasts alike.
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