Apatite (Blue Apatite)
Fluorapatite (Apatite Group) · Semi-Precious Gemstone / Mineral Specimen
Crystal System
Hexagonal; crystals are often prismatic, though usually found in massive or granular form in rough mineral specimens
Mineral Group
Phosphates (Apatite Group)
Chemical Formula
Ca5(PO4)3F with trace elements of iron or rare earth elements for color
Formation Process
Primarily igneous through magmatic crystallization in pegmatites; can also form in metamorphic environments or via hydrothermal processes.
About This Crystal
A translucent to opaque rough specimen featuring a deep teal-blue to neon-blue color. It shows a vitreous to greasy luster with an irregular, granular texture and white rocky matrix inclusions.
Physical Characteristics
Color: Teal blue; Streak: White; Cleavage: Indistinct; Fracture: Conchoidal to uneven; Specific Gravity: 3.1-3.2; Diaphaneity: Translucent to opaque; Fluorescence: Weak yellow to purple-blue in some specimens.
Optical Properties
Refractive Index: 1.63-1.64; Birefringence: 0.002-0.008; Pleochroism: Strong (blue to colorless/yellow); Doubly refractive but often too opaque in rough form to observe without equipment.
Hardness & Durability
Origin Region
Madagascar, Brazil, Mexico, and Myanmar; typically found in pegmatites, hydrothermal veins, and igneous rocks
Hardness & Durability
Mohs hardness of 5 (the index mineral for 5); brittle tenacity; poor wearability for rings, best suited for pendants or display specimens.
Care & Maintenance
Highly sensitive to heat and acids; clean only with warm, soapy water and a soft brush. Avoid ultrasonic cleaners and steam. Store away from harder stones like quartz to prevent scratching.
Rarity & Value
Relatively common but neon-blue 'Paraiba-like' colors are highly sought after. Value is determined by color intensity and transparency. Often inexpensive in rough form.
Special Characteristics
Known for intense 'electric' blue colors; can occasionally show chatoyancy (cat's eye) if fibrous, though not visible in this granular specimen.
Lore & History
The name is derived from the Greek 'apate' meaning to deceive, because it was often mistaken for other minerals like tourmaline or beryl. Historically linked to communication and personal power in folklore.