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Layer-stacking Polytypes
Layer-based minerals having different symmetry systems by different stacking sequences of layer units.
- Ramsdell notation (Suffix, Italic)
- Cubic: -C
- Tetragonal: -Q, -TT
- Orthorhombic: -OR, -O
- Hexagonal: -H
- Trigonal: -T
- Rhombohedral: -R
- Monoclinic: -M
- Triclinic: -A, -TC
- Pseudo: -P
A list of minerals showing layer-stacking polytypism
- Amesite: -2H1, -2H2, -6R1, -6R2
- Anandite: -2M1, -2O
- Andorite: -ORab2c (Fizélyite), -ORab4c, -ORab6c (Ramdohrite), -ORab12c (Andorite IV), -PORab24c (Andorite VI, Nakaseite)
- Annite: -1M
- Anthophyllite: -Mabc (Cummingtonite), -OR2abc (Anthophyllite)
- Atacamite: -R2a2a3c (Paratacamite), -PH(b/2)2ca (Atacamite)
- Cancrinite: -1H (Cancrinite), -Hbbc (Microsommite), -4H (Afghanite)
- Celadonite: -1M
- Chabazite: -2H (Gmelinite), -3R (Chabazite), -3PH (Chabazite)
- Chevkinite: -Mabc (Perrierite-(Ce)), -Mab2c (Chevkinite-(Ce))
- Chloritoid: -Aabc (-1A), -Mab2c (-2M)
- Chrysotile: -2Mcl (Clinochrysotile), -OR (Orthochrysotile), -OR (Parachrysotile)
- Clintonite: -1M, -2M1, -3A
- Coquimbite: -1T (Coquimbite), -3R (Paracoquimbite)
- Cordierite: -1H (Indialite), -1PH (Cordierite)
- Cronstedtite: -1T, -3T, -2H1, -2H2, -6R2
- Gageite: -1A, -2M
- Gersdorffite: -P213, -Pa3, -Pca21
- Gibbsite: -PORabc (Bayerite), -Mba2c, -PM2b2ac (Gibbsite), -Aba2c (Nordstrandite)
- Graphite: -2H, -3R
- Greenalite: -3R, -1M, -2M1, -1A, -2A, -3A
- Gyrolite: -1T, -6H
- Illite: -1M (Low temperature), -1Md (Low temperature), -2M1 (Low-Moderate temperature)
- Kaolinite: -Aabc (Kaolinite), -Mab2c (Dickite) -Mba2c (Nacrite)
- Kalsilite: -1H (Kalsilite), -H3a3ac (Trikalsilite), -H3b3bc (Kaliophilite)
- Laihunite: -1M, -2M, -3O
- Lamprophyllite: -2M, -2O
- Laueite: -Aabc (Laueite), -A2abc (Stewartite)
- Laurionite: -ORqbc (Laurionite), -PH(2a/r3)bc (Paralaurionite)
- Lazurite: -C, -OR, -M, -T
- Lepidolite: -1M, -2M1, -2M2, -3T
- Lizardite: -2H1, -1T
- Lonsdaleite: -2H, -3R (Diamond)
- Magnesiohögbomite: -4H (-2N2S), -5H (-2N3S), -6H (-2N4S), -12H (-6N6S)
- Magnesionigerite: -2N1S, -6N6S
- Magnesiotaaffeite: -4H (-2N2S), -9R (-6N3S, Musgravite)
- Margarite: -2M1
- Molybdenite: -2H (common), -3R (rare)
- Muscovite: -1M (-1M), -2M (-2M1), -Mba2c (-2M2), -3T (-3T), -6H (-6H)
- Paragonite: -3T, -1M, -2M1
- Pearceite: -Tac, -T2ac (Arsenpolybasite-221), -M2a2b2c (Arsenpolybasite-222)
- Pectolite: -Aabc (Pectolite), -A2abc
- Phengite: -3T (High pressure), -2M1 (Low pressure)
- Phlogopite: -3T, -1M, -2M1
- Polybasite: -Tac (Antimonpearceite), -T2ac, -M2a2b2c
- Prehnite: -ORabc (Prehnite), -Mabc
- Protolithionite: -3T
- Pyroaurite: -2H (Sjögrenite), -3R (Pyroaurite)
- Pyrophyllite: -2M, -1A
- Pyrosmalite-(Mn): -1T (Pyrosmalite-(Mn)), -3R (Friedelite)
- Pyrrhotite: -Hbb2c (Troilite), -H2a2a6c, -OR2a2b11c, -H2a2a5c, -M2b2a4c
- Pyrrhotite: -4M, -5C, -5H, -6M, -7H, -11H
- Sabieite: -1T, -2H, -3R
- Sapphirine: -2M, -4M, -1A, -3A, -5A
- Shimazakiite: -4O, -4M
- Silver: -3C, -2H, -4H1
- Sternbergite: -ORab2c, -ORabc (Argentopyrite)
- Stichtite: -2H1 (Barbertonite), -3R1
- Strengite: -ORabc (Phosphosiderite), -OR2abc (Strengite)
- Strontiojoaquinite: -1M, -2O, -4O
- Sudoite: -1A
- Variscite: -PORabc (Metavariscite), -OR2abc (Variscite)
- Veatchite: -Ma2bc (Veatchite), -Mbac
- Wollastonite: -Aabc (Wollastonite), -M2abc (Parawollastonite)
- Wollastonite: -1A, -2M (Parawollastonite), -3A, -4A, -5A, -7A
- Wurtzite: -2H, -4H, -5H, -6H, -8H, -12R, -15R, -18R, -21R
- Xonotlite: -Ma2bc, -Ma2b2c, -A2a2bc, -POR2a2bc, -PORa2b2c