What is Apatite?


Apatite is a group of phosphate minerals that includes fluorapatite, chlorapatite, and hydroxylapatite. It’s primarily found in Russia, Mexico, and the USA. Apatite is often used as a gemstone and is popular for its wide range of colors including blue, green, and yellow.

Apatite is a colorful gemstone that comes in a variety of hues. Its vibrant colors and lustrous appearance make it a popular choice for jewelry, especially rings and necklaces.

Gemstone Properties

Chemical ClassificationInorganic - Phosphate
ColorApatite comes in a variety of colors, including blue, green, yellow, brown, and colorless.
LusterVitreous to greasy.
TransparencyTransparent to translucent.
OccurrenceBrazil, Mexico, and Myanmar.
FormationApatite forms in various geological environments, including igneous, metamorphic, and sedimentary rocks.
DiaphaneityTransparent to translucent
Mohs Hardness5
Specific Gravity3.16-3.22.
Diagnostic PropertiesOften blue or green, low hardness.
Chemical CompositionCa5(PO4)3(F,Cl,OH)
PleochroismVisible in some varieties, especially the blue and green ones.
Crystal SystemHexagonal
Optical PropertiesBiaxial (-)
Refractive Index1.632 - 1.638
Birefringence0.002 - 0.008
2V angleMeasured: 78° to 82°
DispersionNot notably high.