mineral

Aragonite (Flos Ferri)

Calcium Carbonate (CaCO3)

Hardness: 3.5-4.0; Color: White to colorless; Luster: Vitreous to resinous; Crystal structure: Orthorhombic (acicular or branching habits); Cleavage: Distinct in one direction; Specific gravity: 2.95

Hardness: 3
Color: White to colorless
Luster: Vitreous to resinous

Identified February 6, 2026More mineral →

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Physical properties

Hardness: 3.5-4.0; Color: White to colorless; Luster: Vitreous to resinous; Crystal structure: Orthorhombic (acicular or branching habits); Cleavage: Distinct in one direction; Specific gravity: 2.95

Formation & geological history

Formed through low-temperature hydrothermal processes or by precipitation in sedimentary environments such as hot springs and caves. Common in the oxidized zones of ore deposits.

Uses & applications

Primarily used as decorative collector specimens, educational samples, and occasionally as a source of lime in soil treatments or low-grade cement production.

Geological facts

Aragonite is chemically identical to calcite but has a different crystal structure. Over long geological periods at standard temperatures, aragonite often recrystallizes into the more stable calcite.

Field identification & locations

Identified in the field by its distinct branching or 'coral-like' appearance and its vigorous effervescence when exposed to cold dilute hydrochloric acid. Commonly found in mines or cave systems.