Cubic (Isometric)

4/m -3 2/m (Oh)

동일한 길이의 세 축이 90도로 교차 (a = b = c, alpha = beta = gamma = 90°)

등축정계(입방정계)는 서로 수직인 동일한 길이의 세 축을 가집니다. 이 결정계에 속한 광물은 가장 높은 대칭성을 가집니다. 주요 결정 형태로는 정육면체, 팔면체, 십이면체가 있습니다. 대표 광물로는 다이아몬드, 가닛, 황철석, 암염, 형석 등이 있습니다.

The cubic or isometric crystal system is the most symmetrical of all seven crystal systems, with three axes of equal length intersecting at 90-degree angles. This high symmetry produces some of the most recognizable crystal shapes in mineralogy: perfect cubes, octahedra, and dodecahedra. Approximately 12% of known mineral species crystallize in the cubic system, including many of the world's most economically important and visually stunning minerals.

Symmetry

Cubic symmetry means a crystal looks identical when rotated 90° around any of its three axes (a₁ = a₂ = a₃, all at 90°). This produces 36 symmetry elements — the maximum possible for any crystal system. The five cubic crystal classes range from the highly symmetric hexoctahedral class (like diamond and garnet) to the less symmetric tetartoidal class (like ullmannite). Crystals in this system can form cubes {100}, octahedra {111}, rhombic dodecahedra {110}, and complex combinations. Pyrite often forms perfect cubes with striated faces, while garnets characteristically form dodecahedra.

주요 광물

Diamond — the hardest known natural material (Mohs 10) — crystallizes in the cubic system, as does its industrial counterpart spinel. Halite (rock salt) forms near-perfect cubes, making it a classic teaching specimen. Garnets are perhaps the most diverse cubic mineral group, with species like almandine, pyrope, and grossular spanning a range of compositions and colors. Fluorite is famous for its octahedral cleavage and wide color range including the deep purple of Derbyshire 'Blue John.' Galena (lead sulfide) forms distinctive metallic cubes and is the primary ore of lead. Gold and silver also crystallize in the cubic system, though they rarely form visible crystals.

광물 (13)

Diamond

C

01 Native Elements

Pyrite

FeS2

02 Sulfides and Sulfosalts

Sphalerite

ZnS

02 Sulfides and Sulfosalts

Garnet (Almandine)

Fe3Al2(SiO4)3

09 Silicates

Gold

Au

01 Native Elements

Spinel

MgAl2O4

04 Oxides and Hydroxides

Sodalite

Na4Al3Si3O12Cl

09 Silicates

Silver

Ag

01 Native Elements

Halite

NaCl

03 Halides

Fluorite

CaF2

03 Halides

Copper

Cu

01 Native Elements

Galena

PbS

02 Sulfides and Sulfosalts

Magnetite

Fe3O4

04 Oxides and Hydroxides

자주 묻는 질문

What is the Cubic (Isometric) crystal system?
등축정계(입방정계)는 서로 수직인 동일한 길이의 세 축을 가집니다. 이 결정계에 속한 광물은 가장 높은 대칭성을 가집니다. 주요 결정 형태로는 정육면체, 팔면체, 십이면체가 있습니다. 대표 광물로는 다이아몬드, 가닛, 황철석, 암염, 형석 등이 있습니다.
What minerals crystallize in the Cubic (Isometric) system?
There are 13 minerals that crystallize in the Cubic (Isometric) crystal system on MineralFYI.
What symmetry does the Cubic (Isometric) system have?
The Cubic (Isometric) crystal system has 4/m -3 2/m (Oh) symmetry.
What are the axes of the Cubic (Isometric) crystal system?
The Cubic (Isometric) system is characterized by 동일한 길이의 세 축이 90도로 교차 (a = b = c, alpha = beta = gamma = 90°).