Aragonite (Flos Ferri)
Aragonite (variety Flos Ferri) · Mineral Specimen / Collector Mineral
Crystal System
Orthorhombic with an acicular or coralloid (branch-like) habit
Mineral Group
Carbonates (Aragonite Group)
Chemical Formula
CaCO3
Formation Process
Sedimentary or Hydrothermal; specifically formed via chemical precipitation in iron mines or caves through the slow dripping of calcium-rich water.
About This Crystal
This specimen exhibits a branching, coral-like appearance known as 'Flos Ferri' (flower of iron). It is opaque to translucent with a white to creamy body color and a dull to sub-vitreous luster. The surface is covered in tiny, druzy micro-crystals giving it a frosted texture.
Physical Characteristics
Color: White; Streak: White; Cleavage: Distinct in one direction (though rarely visible in coralloid forms); Fracture: Subconchoidal; Specific Gravity: 2.93 - 2.95; Tenacity: Brittle; Fluorescence: May show weak cream or pink fluorescence 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
Notably from Styria (Eisenerz), Austria; also found in cave environments in Mexico, Italy, and the USA (Arizona).
Hardness & Durability
Mohs Hardness: 3.5 to 4.0. It is quite soft and fragile, susceptible to scratches and structural damage if handled roughly. Not suitable for most jewelry.
Care & Maintenance
Clean only with compressed air or very gentle rinsing in distilled water; avoid all acids (including vinegar) as they will dissolve the carbonate structure. Store in a padded, dust-free container away from heat and mechanical shock.
Rarity & Value
Uncommon in this specific 'Flos Ferri' coralloid form. Value is determined by the intricacy of the branching and the lack of damage. Specimens usually range from $20 to $150 depending on size and aesthetics.
Special Characteristics
Features a unique coralloid (coral-like) growth pattern. Unlike common aragonite stars, this variety lacks symmetry and grows in twisted, organic-looking branches.
Lore & History
Historically named 'Flos Ferri' by miners who found it in the iron mines of Styria. Symbolically, it was often associated with 'stone flowers' or cave spirits. In metaphysical lore, it is believed to be a grounding stone that provides patience and stability during times of stress.