Aragonite Flos Ferri
Aragonite · Mineral Specimen
Crystal System
Orthorhombic; typically exhibits branching coralloid or acicular (needle-like) habits in this variety.
Mineral Group
Carbonates (Aragonite Group)
Chemical Formula
CaCO3
Formation Process
Hydrothermal or Sedimentary; typically forms from the precipitation of calcium carbonate-rich waters in caves or near hot springs at low temperatures.
About This Crystal
This specimen features a 'Flos Ferri' (flower of iron) habit, characterized by white, branching, coral-like structures. It has a vitreous to pearly luster and is translucent to opaque with a snowy white color.
Physical Characteristics
Color: White; Streak: White; Cleavage: Distinct on {010}; Fracture: Subconchoidal; Specific Gravity: 2.93–2.95; Fluorescence: Often shows yellowish-white or pinkish under LWUV.
Optical Properties
Refractive Index: 1.530–1.685; Birefringence: 0.155 (very high); Dispersion: Low; Biaxial negative; no significant pleochroism.
Hardness & Durability
Origin Region
Styria, Austria (Eisenerz); also found in Mexico, Morocco, and various cave systems worldwide.
Hardness & Durability
Mohs Hardness: 3.5 to 4.0; Very brittle toughness; poor durability for jewelry, primarily a collector's specimen.
Care & Maintenance
Avoid contact with acids (will effervesce and dissolve). Clean only with dry air or very gentle brush; sensitive to heat and ultrasonic cleaning. Store away from moisture.
Rarity & Value
Uncommon as a well-formed 'Flos Ferri' variety. Value depends on the intricacy of the branching and the whiteness of the specimen.
Special Characteristics
Coralloid growth pattern; some specimens exhibit phosphorescence or 'green' thermoluminescence when heated gently.
Lore & History
Historically named 'Flos Ferri' due to its frequent discovery in the cavities of iron mines. In metaphysical lore, it is believed to be a grounding stone that fosters patience and stability.