Garnet (Almandine)

Fe3Al2(SiO4)3

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The most common garnet species, almandine is an iron aluminum silicate (Fe3Al2(SiO4)3) that serves as a key metamorphic index mineral. It crystallizes in the cubic system, forming dodecahedral or trapezohedral crystals with a vitreous luster, a colorless streak, and no cleavage. Colors are deep red, reddish-brown, or black, with a Mohs hardness of 6.5 to 7.5 and a specific gravity from 3.93 to 4.32. Almandine belongs to a group that also includes pyrope, grossular, andradite, spessartine, and uvarovite, and its hardness makes it valuable both as a gemstone and as an industrial abrasive. Its conchoidal to uneven fracture and absence of cleavage help separate garnet from the silicates it accompanies in schists and gneisses.

Almandine is the most common garnet species and a key metamorphic indicator mineral. The garnet group includes pyrope, grossular, andradite, spessartine, and uvarovite. Garnets are widely used as gemstones and abrasives.

ระบบผลึก Cubic (Isometric)
หมวดหมู่แร่ธาตุ 09 Silicates
ความแข็งโมห์ส 6.5-7.5
ความถ่วงจำเพาะ 3.93-4.32
สี Deep red, reddish-brown, black
ความวาว Vitreous
สีเส้นขูด Colorless
การแตกเรียบ None
รอยแตก Conchoidal to uneven
ความโปร่งใส Transparent
ลักษณะผลึก Dodecahedral, trapezohedral

ความแข็งโมห์ส

Mohs Hardness: 6.5 – 7.5
1 Soft10 Hard
Garnet (Almandine) has a Mohs hardness of 6.5–7.5 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

Cubic (Isometric)
Garnet (Almandine) crystallizes in the Cubic (Isometric) crystal system.
คุณสมบัติ Value
ระบบผลึก Cubic (Isometric)
Axial Relationships a = b = c, α = β = γ = 90°

Frequently Asked Questions

What is the hardness of Garnet (Almandine)?
Garnet (Almandine) has a Mohs hardness of 6.5-7.5.
What crystal system does Garnet (Almandine) belong to?
Garnet (Almandine) crystallizes in the Cubic (Isometric) crystal system.
What color is Garnet (Almandine)?
Garnet (Almandine) is typically Deep red, reddish-brown, black.
What type of luster does Garnet (Almandine) have?
Garnet (Almandine) exhibits a Vitreous luster.
What is the chemical formula of Garnet (Almandine)?
The chemical formula of Garnet (Almandine) is Fe3Al2(SiO4)3.