Blue Apatite
Fluorapatite (var. Blue Apatite) · Semi-Precious Gemstone and Collector Mineral
Crystal System
Hexagonal crystal system; typical habit is prismatic hexagonal crystals or massive/granular forms. This specimen is a tumbled/polished pebble.
Mineral Group
Phosphates group; specifically the Apatite supergroup (Fluorapatite)
Chemical Formula
Ca5(PO4)3F with traces of Mn, Fe, and Rare Earth Elements (REE)
Formation Process
Magmatic/Igneous: occurs in pegmatites and granitic rocks. Also found in metamorphic rocks such as marbles or via hydrothermal processes.
About This Crystal
This is a polished, deep teal-to-navy blue specimen. It exhibits a vitreous to greasy luster with translucent to near-opaque transparency. Internal fractures and cloud-like inclusions provide a layered depth, characteristic of neon-blue varieties.
Physical Characteristics
Color: Teal-blue; Streak: White; Cleavage: Poor/indistinct in one direction; Fracture: Conchoidal to uneven; Specific Gravity: 3.16–3.22; Fluorescence: Often yellow or blue under SW-UV.
Optical Properties
Uniaxial negative; Refractive Index: 1.634–1.642; Birefringence: 0.002–0.008; Strong pleochroism (blue to colorless/yellowish). Single refraction with low dispersion.
Hardness & Durability
Origin Region
Notable sources include Madagascar, Brazil, Mexico, and Myanmar. Madagascar is specifically known for this deep teal-blue neon quality.
Hardness & Durability
Mohs Hardness: 5 (Defining mineral for 5). It is brittle with poor toughness. It is heat-sensitive and susceptible to scratching by quartz or harder gems.
Care & Maintenance
Cleaning: Use only warm soapy water. Do not use ultrasonic cleaners or steam. Avoid acids/chemicals. Store separately from harder stones to prevent scratching. Keep away from intense heat.
Rarity & Value
Locality-dependent; Madagascar neon blue is popular. Value is determined by color intensity and clarity. Common treatments: Heat treatment is frequently used to enhance or stabilize the blue color.
Special Characteristics
Exhibits strong pleochroism and can occasionally show chatoyancy (cat's eye) when cut as a cabochon. Known for its 'neon' glow due to REE inclusions.
Lore & History
Historically named after the Greek word 'apate' (to deceive) because it was often confused with fluorite or aquamarine. Traditional beliefs associate it with the Throat Chakra, communication, and suppressing hunger.