Apatite

Ca5(PO4)3(F,Cl,OH)

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As the reference mineral for hardness 5 on the Mohs scale, apatite occupies the middle of that comparative sequence. The name denotes a group of calcium phosphate minerals with the general formula Ca5(PO4)3(F,Cl,OH) that crystallize in the hexagonal system. Specimens are transparent and vitreous and range widely in color through green, blue, yellow, violet, and colorless, with a white streak and poor basal cleavage. Beyond its mineralogy, apatite is biologically fundamental: it serves as the principal reservoir of phosphorus for living systems and forms both tooth enamel and the inorganic fraction of bone. Prismatic and tabular crystals are the usual habit, and the specific gravity falls between 3.16 and 3.22.

Apatite refers to a group of phosphate minerals and is the reference mineral for hardness 5 on the Mohs scale. It is the main source of phosphorus for biological systems and is the mineral that makes up tooth enamel and bone mineral.

ระบบผลึก Hexagonal
หมวดหมู่แร่ธาตุ 08 Phosphates, Arsenates, and Vanadates
ความแข็งโมห์ส 5.0
ความถ่วงจำเพาะ 3.16-3.22
สี Green, blue, yellow, violet, colorless
ความวาว Vitreous
สีเส้นขูด White
การแตกเรียบ Poor {0001}
รอยแตก Conchoidal to uneven
ความโปร่งใส Transparent
ลักษณะผลึก Prismatic, tabular

ความแข็งโมห์ส

Mohs Hardness: 5.0 – 5.0
1 Soft10 Hard
Apatite has a Mohs hardness of 5 on the 1–10 mineral hardness scale.
ความแข็งโมห์ส Reference Mineral
1 Talc
2 Gypsum
3 Calcite
4 Fluorite
5 Apatite
6 Orthoclase
7 Quartz
8 Topaz
9 Corundum
10 Diamond

ระบบผลึก

Hexagonal
Apatite crystallizes in the Hexagonal crystal system.
คุณสมบัติ Value
ระบบผลึก Hexagonal
Axial Relationships a = b ≠ c, α = β = 90°, γ = 120°

Frequently Asked Questions

What is the hardness of Apatite?
Apatite has a Mohs hardness of 5.0.
What crystal system does Apatite belong to?
Apatite crystallizes in the Hexagonal crystal system.
What color is Apatite?
Apatite is typically Green, blue, yellow, violet, colorless.
What type of luster does Apatite have?
Apatite exhibits a Vitreous luster.
What is the chemical formula of Apatite?
The chemical formula of Apatite is Ca5(PO4)3(F,Cl,OH).