mineral

Argetine Blue Agate (Chalcendony variant)

Silicon Dioxide (SiO₂)

Hardness: 6.5-7 (Mohs scale); Color: Blue-grey with swirls of white and brown; Luster: Vitreous to waxy; Crystal Structure: Trigonal (Cryptocrystalline); Cleavage: None; Specific Gravity: 2.58-2.64

Hardness: 6
Color: Blue-grey with swirls of white and brown
Luster: Vitreous to waxy

Identified April 2, 2026More mineral →

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Physical properties

Hardness: 6.5-7 (Mohs scale); Color: Blue-grey with swirls of white and brown; Luster: Vitreous to waxy; Crystal Structure: Trigonal (Cryptocrystalline); Cleavage: None; Specific Gravity: 2.58-2.64

Formation & geological history

Formed in volcanic cavities (vesicles) where silica-rich fluids deposited over time, often during the Tertiary period. This specific blue variety is strongly associated with formations in Argentina.

Uses & applications

Primarily used in jewelry as cabochons, for ornamental carvings, and as a healing stone in metaphysical practices. Often found in mineral collections.

Geological facts

Blue agates are prized for their calming aesthetics. This particular specimen shows 'swirl' or 'cloud' inclusions typical of Chalcedony, which is a microcrystalline variety of Quartz.

Field identification & locations

Identify in the field by its waxy luster, conchoidal fracture, and translucency. It is commonly found in river deposits or volcanic areas. Look for the 'orange skin' texture on weathered exteriors.

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