Abalone Shell / Paua Shell
Biogenic Calcium Carbonate (Nacre / Mother of Pearl) · Organic Gem
Crystal System
Orthorhombic (Aragonite) / Trigonal (Calcite)
Mineral Group
Carbonates
Chemical Formula
CaCO3
Formation Process
Biogenic precipitation by marine gastropods (mollusks of the family Haliotidae), secreting layers of aragonite platelets bound by conchiolin.
About This Crystal
The specimen features decorative inlaid segments within metal flower-shaped settings, exhibiting intense iridescent flashes of pink, magenta, green, blue, and gold with a pearly luster and typical organic flame-like or swirling grain patterns.
Physical Characteristics
Colors range from iridescent greens and blues to deep magentas and pinks; white streak; no cleavage; uneven fracture; specific gravity approximately 2.65 to 2.95; brittle tenacity; reactive to acids due to carbonate content.
Optical Properties
Displays strong iridescence (orient/play of color) caused by the interference and diffraction of light through microscopic aragonite platelets. Doubly refractive with high birefringence.
Hardness & Durability
Origin Region
New Zealand, Pacific Northwest of North America, South Africa, Japan, California
Hardness & Durability
Mohs hardness of 3.5 to 4.0; poor toughness; sensitive to acids, harsh chemicals, excessive heat, and prolonged direct sunlight; relatively soft, requiring gentle care when worn as jewelry.
Care & Maintenance
Clean only with mild soapy water and a soft cloth. Never use ultrasonic or steam cleaners, and avoid harsh chemicals, perfumes, and abrasive materials. Store separately to prevent scratching.
Rarity & Value
Common to moderately rare depending on the species and quality of the shell. Value is determined by vibrancy of color, pattern intensity, and craftsmanship of the setting. Treatments can include dyeing or resin coating.
Special Characteristics
Notable for its exceptional natural iridescence (nacreous play of color), created by the physical structure of microscopic aragonite platelets diffracting light.
Lore & History
Historically used by indigenous peoples worldwide, particularly Native Americans and the Māori (who call it Paua), for ceremonial items, fish hooks, and jewelry. In modern metaphysical practices, it is associated with water elements, emotional healing, and calming energies, though these are traditional beliefs rather than scientific claims.