Description
Product Overview
This 250g bag of Green Banded Agate tumblestones from Brazil features large, carefully selected polished stones measuring approximately 30–40mm. Each piece displays distinctive banding patterns and rich green tones, enhanced by a smooth polished finish. Supplied with a Certificate of Authenticity lifetime guarantee card, this bulk set is ideal for collectors, display, crafting, or resale. The listing image shows an example of the stones you will receive, with each bag offering natural variation in colour, banding, and pattern. Please refer to the photo for full sizing and scale.
Mineral Identification and Composition
Green Banded Agate is a variety of chalcedony, which itself is a microcrystalline form of quartz composed of silicon dioxide (SiO₂). Agate is characterised by its layered structure, formed through successive deposition of silica within cavities in volcanic rock.
The green coloration is typically achieved through natural mineral inclusions or enhancement processes applied to agate to accentuate its banding. The layered structure remains natural, with concentric or flowing bands that create visually striking patterns across each stone.
Crystal Structure and Physical Properties
As a member of the quartz family, agate shares the trigonal crystal system at the microscopic level, although it appears massive to the naked eye. Its fine-grained structure allows it to be polished to a smooth, durable finish.
Typical properties include:
- Colour: Green with lighter and darker banding patterns
- Lustre: Waxy to vitreous when polished
- Transparency: Translucent to opaque
- Hardness: 6.5–7 on the Mohs scale
The tumbling process enhances the natural banding and provides a uniform, smooth surface across each piece.
Geological Formation and Brazilian Origin
Agate forms within cavities of volcanic rocks, where silica-rich fluids deposit layers of microcrystalline quartz over time. These layers build up gradually, creating the characteristic banded structure.
Brazil is one of the world’s leading sources of agate, producing large quantities of high-quality material. The deposits are typically associated with ancient volcanic regions, where gas bubbles in cooling lava created the cavities later filled with silica deposits.
Appearance and Natural Variation
Each Green Banded Agate tumblestone is unique, with variations in band thickness, colour intensity, and pattern formation. Some stones may show bold, contrasting bands, while others feature more subtle, flowing layers.
The polished finish highlights these natural patterns, making each stone visually distinct. Variations are a natural part of agate formation and contribute to the individuality of every piece within the 250g set.
Uses and Collecting Appeal
Green Banded Agate tumblestones are widely appreciated by mineral collectors, gemstone enthusiasts, and craft users. Their larger size of 30–40mm makes them suitable for display pieces, decorative arrangements, or inclusion in curated mineral collections.
In non-scientific and cultural contexts, agate is traditionally associated with stability and grounding and is often appreciated in spiritual or decorative settings. These interpretations are based on cultural traditions rather than scientific evidence.
Authenticity and Presentation
- Genuine Green Banded Agate (chalcedony, SiO₂) from Brazil
- 250g bulk bag of large tumblestones
- Individual stone size: approximately 30–40mm
- Smooth polished finish with natural banding patterns
- Supplied with a Certificate of Authenticity lifetime guarantee card
- Listing image shows an example of the stones you will receive
This Green Banded Agate tumblestone set offers a combination of Brazilian origin, distinctive layered patterns, and polished presentation, making it a versatile and attractive addition to any mineral collection or display.
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