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Apatite
Apatite is a Calcium Phosphate, often confused with other minerals as beryl, peridot and olivine, its softnes limits an aceptance of apatite as a genmstone

Physical Characteristics

 

Color: Green - Yellow, ocassionally blue, purple or redish brown
Luster: Vitreous, greasy
Transparency: Transparent to translucent
Crystal System: Hexagonal
Habits: Hexagonal prism with a hexagonal pyramid or pinacoid termination
Fracture: Conchoideal
Cleavage: Indistinct in one direction
Hardness: 5
Specific Gravity: 3.1 - 3.2
Streak: White
Other: Sometimes shows a slightly "melty" look as a salt rock exposed to water
Occurrence: Mexico (Durango), Canada, Germany, Russia