crystallography and minerals arranged by crystal form
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Crystallography and Minerals Arranged by Crystal Form
Amorphous Isometric Tetragonal Orthorhombic Hexagonal Trigonal Monoclinic Triclinic
1. Crystal Groups and Classes - Crystallography groups are composed of 32 classes of symmetry derived from observations of the external crystal form. From these 32 classes, 230 space groups (see Crystallography 101) are distinguishable using x-ray analysis. For additional information on crystal systems, please review an excellent on-line treatment of this subject, the Introduction to Crystallography and Mineral Crystal Systems by Mike and Darcy
System (1) Class Name (2)AXES
Planes CenterHermann-Maugin Symbols (3)2-Fold3-Fold4-Fold6-Fold
Isometric
Tetartoidal 3 4 - - - - 23
Diploidal 3 4 - - 3 yes 2/m 3
Hextetrahedral 3 4 - - 6 - 4 3m
Gyroidal 6 4 3 - - - 432
Hexoctahedral 6 4 3 - 9 yes 4/m 3 2/m
Tetragonal
Disphenoidal 1 - - - - - 4
Pyramidal - - 1 - - - 4
Dipyramidal - - 1 - 1 yes 4/m
Scalenohedral 3 - - - 2 - 4 2m
Ditetragonal pyramidal - - - - 4 - 4mm
Trapezohedral 4 - 1 - - - 422
Ditetragonal-Dipyramidal 4 - 1 - 5 yes 4/m 2/m 2/m
Orthorhombic
Pyramidal 1 - - - 2 - mm2
Disphenoidal 3 - - - - - 222
Dipyramidal 3 - - - 3 yes 2/m 2/m 2/m
Hexagonal Trigonal Dipyramidal - 1 - - 1 - 6
Pyramidal - - - 1 - - 6
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Dipyramidal - - - 1 1 yes 6/m
Ditrigonal Dipyramidal 3 1 - - 4 - 6m2
Dihexagonal Pyramidal - - - 1 6 - 6mm
Trapezohedral 6 - - 1 - - 622
Dihexagonal Dipyramidal
6 - - 1 7 yes 6/m 2/m 2/m
Trigonal
Pyramidal - 1 - - - - 3
Rhombohedral - 1 - - - yes 3
Ditrigonal Pyramidal - 1 - - 3 - 3m
Trapezohedral 3 1 - - - - 32
Hexagonal Scalenohedral 3 1 - - 3 yes 3 2/m
Monoclinic
Domatic - - - - 1 - m
Sphenoidal 1 - - - - - 2
Prismatic 1 - - - 1 yes 2/m
TriclinicPedial - - - - - - 1
Pinacoidal - - - - - yes 1
ISOMETRIC - Mike and Darcy Howard's Details on The Cubic (Isometric) System
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Isometric (Cubic) Crystal Classes
Crystal AxesExample
Form
Java Example
Forms and Links to Mineral Listings
Paper Models
IsometricCrystallographi
cAxes
Isometric Minerals Crystal Form Example[214], [104], [024], [100], [010]
Class Unknown Mineral Listing
Isometric Diploidal Mineral ListingH-M Symbol (2/m 3)
IsometricGyroidal Mineral ListingH-M Symbol (4 3 2)
IsometricHexoctahedral Mineral Listing H-M Symbol (4/m 3 2/m)
IsometricHextetrahedral Mineral ListingH-M Symbol (4 3m)
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IsometricTetartoidal Mineral ListingH-M Symbol (2 3)
TETRAGONAL - Mike and Darcy Howard's Details on The Tetragonal System
Tetragonal Crystal Classes
Crystal Axes Example Form
Java Example
Forms and Links to Mineral Listings
Paper Models
TetragonalCrystallograp
hicAxes
Tetragonal Mineral Crystal Form Example[214], [104], [024], [100], [010]
Class Unknown Mineral Listing
TetragonalDipyramidal Mineral ListingH-M Symbol (4/m)
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TetragonalDisphenoidal Mineral ListingH-M Symbol (4)
Tetragonal Ditetragonal Dipyramidal Mineral ListingH-M Symbol (4/m 2/m 2/m)
TetragonalPyramidal Mineral ListingH-M Symbol (4)
TetragonalDitetragonal-pyramidal Mineral ListingH-M Symbol (4mm)
Tetragonal Scalenohedral Mineral ListingH-M Symbol (4 2m)
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TetragonalTrapezohedral MineralH-M Symbol (4 2 2)
ORTHORHOMBIC - Mike and Darcy Howard's Details on The Orthorhombic System
Orthorhombic Crystal Classes
Crystal Axes Example Form
Java Example
Forms and Links to Mineral Listings
Paper Models
OrthorhobicCrystallograp
hicAxes
Orthorhombic Minerals Crystal Form Example[214], [104], [024], [100], [010]
Class Unknown Mineral Listing.
OrthorhombicDipyramidal Mineral ListingH-M Symbol (2/m 2/m
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2/m)
OrthorhombicDisphenoidal Mineral ListingH-M Symbol (2 2 2)
OrthorhombicPyramidal Mineral ListingH-M Symbol (mm2)
HEXAGONAL - Mike and Darcy Howard's Details on The Hexagonal System (Hexagonal Division)
Hexagonal Crystal Classes
Crystal Axes Example Form
Java Example
Forms and Links to Mineral Listings
Paper Models
Hexagonal Minerals Crystal Form Example.[214], [104], [024], [100], [010]
Class Unknown Mineral Listing.
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HexagonalCrystallograp
hicAxes
HexagonalDihexagonal Dipyramidal Mineral ListingH-M Symbol (6/m 2/m 2/m)
HexagonalDihexagonal Pyramidal Mineral ListingH-M Symbol (6mm)
HexagonalDipyramidal Mineral ListingH-M Symbol (6/m)
HexagonalDitrigonal Dipyramidal Mineral ListingH-M Symbol (6 m2)
HexagonalPyramidal Mineral ListingH-M Symbol (6)
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HexagonalTrapezohedral Mineral ListingH-M Symbol (6 2 2)
Hexagonal Trigonal Dipyramidal MineralH-M Symbol (6)
TRIGONAL - Mike and Darcy Howard's Details on The Hexagonal System (Trigonal Division)
Trigonal Crystal Classes
Crystal Axes Example Form
Java Example
Forms and Links to Mineral Listings
Paper Models
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TrigonalCrystallograp
hicAxes
Trigonal Minerals Crystal Form Example.[214], [104], [024], [100], [010]
Class Unknown Mineral Listing.
TrigonalDitrigonal Pyramidal Mineral Listing and Stereo image.H-M Symbol (3m)
TrigonalHexagonal Scalenohedral Mineral Listing and Stereo image.H-M Symbol (3 2/m)
TrigonalPyramidal Mineral Listing and Stereo image.H-M Symbol (3)
TrigonalRhombohedral Mineral Listing and Stereo image.H-M Symbol ( 3)
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Trigonal Trapezohedral Mineral Listing and Stereo image.H-M Symbol (3 2)
MONOCLINIC - Mike and Darcy Howard's Details on The Monoclinic System
Monoclinic Crystal Classes
Crystal Axes Example Form
Java Example Forms
and Links to Mineral Listings
Paper Models
MonoclinicCrystallograp
hicAxes
β <> 90°
Monoclinic Minerals Crystal Form Example.[214], [104], [024], [100], [010]
Class Unknown Mineral Listing.
MonoclinicDomatic Mineral ListingH-M Symbol (m)
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MonoclinicPrismatic Mineral ListingH-M Symbol (2/m)
MonoclinicSphenoidal Mineral ListingH-M Symbol (2)
TRICLINIC - Mike and Darcy Howard's Details on The Triclinic System
Triclinic Crystal Classes
Crystal Axes Example Form Java Example
Paper Models
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Forms and
Links to Mineral Listings
TriclinicCrystallographi
cAxes
α,β,γ <> 90
Triclinic Minerals Crystal Form Example.[214], [104], [024], [100], [010]
Class Unknown Mineral Listing.
TriclinicPedial Mineral ListingH-M Symbol (1)
TriclinicPinacoidal Mineral ListingH-M Symbol ( 1)