Mother of Pearl Shell Fragment
Biogenic Calcium Carbonate (Aragonite/Calcite) var. Nacre · Organic Gem
Crystal System
Orthorhombic (Aragonite) or Trigonal (Calcite); Biogenic amorphous/tabular habit
Mineral Group
Carbonates
Chemical Formula
CaCO3
Formation Process
Biogenic precipitation by mollusks, depositing layers of aragonite platelets and organic matrix (conchiolin) in marine environments
About This Crystal
A small, smooth, off-white to cream-colored mollusk shell fragment featuring visible natural growth lines and a pearlescent, iridescent luster with a curved, flattened shape.
Physical Characteristics
Color: White, cream with iridescent sheen. Streak: White. Cleavage: None distinct in organic form. Fracture: Uneven to splintery. Specific Gravity: 2.65 to 2.95. Tenacity: Brittle.
Optical Properties
Biaxial negative (aragonite component), strong iridescence, pearlescent luster, translucent to opaque.
Hardness & Durability
Origin Region
Worldwide marine environments, commonly coastal regions of the tropics, South Pacific, and Indian Ocean
Hardness & Durability
Mohs hardness of 3.5 to 4.5. Low toughness, sensitive to acids, scratching, and harsh chemicals. Poor durability for everyday jewelry without protective settings.
Care & Maintenance
Clean with mild soapy water and a soft cloth. Avoid ultrasonic cleaners, steam, prolonged immersion in water, harsh chemicals, and acidic substances. Store separately to prevent scratching.
Rarity & Value
Common; widely accessible as beach finds or byproducts of the pearl industry. Value is generally very low unless crafted into high-end jewelry or inlay art.
Special Characteristics
Exhibits strong nacreous iridescence (mother-of-pearl effect) caused by light interference through microscopic aragonite platelets.
Lore & History
Historically used across many coastal cultures for jewelry, buttons, and decorative inlay work. In modern metaphysical lore, mother-of-pearl is traditionally associated with calming energy, stress relief, and connection to the water element and the ocean.