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Themes > Science > Physics > Solid State Physics > Atomic Bonding and Crystal Structure > Crystal Structure and Crystal Planes > Systems of Crystals |
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Type (and Net) |
Number of Faces |
Shape(s) of Faces |
Examples* |
cubic (isometric) |
6 |
all are squares |
pyrite, silver, gold, diamond, garnet, galena, halite (rock salt), spinel, fluorite |
tetragonal |
6 |
4 rectangles 2 squares right angles |
zircon |
orthorhombic |
6 |
all rectangles 3 pairs of rectangles with different sizes right angles |
topaz, epsonite, barite |
rhombohedral |
6 |
rhombuses on all sides no right angles |
calcite |
monoclinic |
6 |
4 rectangles 2 parallelograms 16 right angles 8 other angles |
gypsum, muscovite, azurite |
triclinic |
6 |
parallelograms no right angles |
turquoise |
hexagonal |
8 |
2 hexagons 6 rectangles right angles |
ice, apatite, emerald, quartz, hematite |
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