Blue Apatite
Fluorapatite (member of the Apatite supergroup) · Semi-Precious Gemstone / Collector Mineral
Crystal System
Hexagonal system; typically forms in prismatic crystals with hexagonal cross-sections, but seen here as a tumbled, rounded pebble.
Mineral Group
Phosphates / Apatite Group
Chemical Formula
Ca5(PO4)3F with traces of OH and Cl
Formation Process
Primarily magmatic crystallization in igneous rocks (pegmatites) or hydrothermal activity; occasionally metamorphic.
About This Crystal
A translucent to near-opaque tumbled stone with a deep peacock-blue to teal-blue hue. It features visible internal fractures and golden-to-brown veining or matrix material. The luster is vitreous (glassy) and the surface appears smooth from polishing.
Physical Characteristics
Color: Teal blue; Streak: White; Cleavage: Indistinct; Fracture: Conchoidal to uneven; Specific Gravity: 3.16-3.23; Low fluorescence usually (yellowish or violet-blue under UV).
Optical Properties
Refractive Index: 1.632-1.648; Birefringence: 0.002-0.008 (unidirectionally refractive); Pleochroism: Strong (blue to colorless/greenish).
Hardness & Durability
Origin Region
Notable sources include Madagascar, Brazil, Mexico, and Myanmar; typically found in igneous rocks such as pegmatites.
Hardness & Durability
Mohs Hardness: 5 (defines 5 on the scale); Brittle toughness; Sensitive to acids and localized heat. Low durability for rings; better for pendants/earrings.
Care & Maintenance
Avoid ultrasonic and steam cleaners. Clean only with warm, soapy water and a soft cloth. Store separately from harder stones like quartz to prevent scratches.
Rarity & Value
Relatively common but high-quality gem-grade specimens are scarcer. Value is determined by color intensity; teal-blue Madagascar material is highly sought after.
Special Characteristics
Known for its 'neon' or 'electric' blue colors; can occasionally show chatoyancy (cat's eye effect) if fibrous inclusions are present.
Lore & History
Historically confused with other gems (name derived from Greek 'apatau' meaning to deceive). Traditionally associated with the Throat Chakra, believed to aid communication and clarity.