mineral
Blue Apatite
Fluorapatite / Apatite Group (Ca5(PO4)3(F,Cl,OH))
Hardness: 5 on Mohs scale; Color: Deep teal-blue to turquoise; Luster: Vitreous to sub-resinous; Crystal system: Hexagonal; Specific gravity: 3.16-3.22
- Hardness
- 5 on Mohs scale
- Color
- Deep teal-blue to turquoise
- Luster
- Vitreous to sub-resinous
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Physical properties
Hardness: 5 on Mohs scale; Color: Deep teal-blue to turquoise; Luster: Vitreous to sub-resinous; Crystal system: Hexagonal; Specific gravity: 3.16-3.22
Formation & geological history
Forms primarily in igneous rocks such as pegmatites, metamorphic rocks, and hydrothermally altered environments. Major deposits exist in Madagascar, Brazil, Mexico, and Russia.
Uses & applications
Used widely in ornamental carvings, polished tumbled stones, beads, and gemstone jewelry. Apatite group minerals are also a major industrial source of phosphorus for fertilizers.
Geological facts
Apatite is the defining mineral for hardness 5 on Mohs scale. Its name comes from the Greek word 'apate', meaning 'deceit', because it was historically often confused with other minerals like beryl, tourmaline, and topaz.
Field identification & locations
Identified by its rich blue-teal color, glass-like luster, and relative softness (scratched easily by a steel nail/knife). Commonly sold in tumbled and polished forms by lapidary vendors.
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