Blue Lace Agate
Quartz var. Chalcedony (Agate) · Semi-Precious Gemstone / Decorative Stone
Crystal System
Trigonal (Monoclinic/Triclinic on a micro-scale); Cryptocrystalline habit
Mineral Group
Silicates (Tectosilicate subgroup)
Chemical Formula
SiO2 (Silicon Dioxide) with trace iron and manganese
Formation Process
Hydrothermal deposition within volcanic rock cavities (vesicles) or sedimentary fissures
About This Crystal
A translucent to opaque variety of chalcedony characterized by delicate, ribbon-like bands of light blue and white. It has a vitreous to waxy luster and a smooth, tumbled surface in this specimen.
Physical Characteristics
Color: Sky blue to lavender with white bands; Streak: White; Cleavage: None; Fracture: Conchoidal; Specific Gravity: 2.60–2.64; Fluorescence: Often inert or faint yellow under UV.
Optical Properties
Refractive Index: 1.530–1.540; Birefringence: Up to 0.004; Optical character: Aggregate; No significant pleochroism.
Hardness & Durability
Origin Region
Namibia (specifically the Karas region), South Africa, and Brazil
Hardness & Durability
Mohs Hardness: 6.5–7; Excellent toughness due to microcrystalline structure; Stable under normal light and heat.
Care & Maintenance
Clean with warm soapy water/soft brush; avoid harsh chemicals and prolonged direct sunlight which may cause dehydration or fading.
Rarity & Value
Relatively uncommon compared to standard agate; Value is determined by color intensity and pattern clarity; Generally affordable but increasing in price due to limited supply in Namibia.
Special Characteristics
Distinctive 'laced' or 'banded' pattern caused by rhythmic deposition of silica; non-pleochroic and doubly refractive aggregate.
Lore & History
Traditionally associated with the Throat Chakra; historically used as a 'stone of communication' and peace. Widely used in Victorian jewelry and traditional lapidary arts.