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Next: APPENDIX 2 Up: Nomenclature of Polytype Structures Previous: II.2. Descriptive symbols: notation

APPENDIX 1

Examples of the application of the modified Gard nomenclature to some representative mineral groups, followed by traditional names in parentheses (not all examples are strict polytypes); further examples are given in the 1977 report

Elements
graphite-2H (graphite-2H)
graphite-3R (graphite-3R)
Sulphides
sternbergite-Oab2c (sternbergite)
sternbergite-Oabc (argentopyrite)
pyrrhotite-Hbbc (troilite)
pyrrhotite-H2a2a6c (6C-type pyrrhotite)
pyrrhotite-O2a2b11c (11C-type pyrrhotite)
pearceite-${\psi}Haac$ (pearceite)
pearceite-${\psi}H2a2a2c$ (arsenopolybasite)
andorite-Oab12c (andorite)
andorite-${\psi}Oab24c$ (nakaseite)
Halogenides
atacamite-R2a2a3c (paratacamite)
Oxides
taaffeite-4H (taaffeite)
taaffeite-9R
gibbsite-${\psi}Oabc$ (bayerite)
gibbsite-Mba2c (hydrargillite)
Carbonates
hydrotalcite-2H (manasseite)
pyroaurite-3R (pyroaurite)
Borates
veatchite-Ma2bc (veatchite)
Sulphates
coquimbite-3R (paracoquimbite)
Phosphates, arsenates, and vanadates
variscite-${\psi}Oabc$ (metavariscite)
strengite-${\psi}Oabc$ (metastrengite)
Silicates
chloritoid-Aabc (chloritoid-1A)
zoisite-Mabc (clinozoisite)
cordierite-1H (indialite)
anthophyllite-O2abc (anthophyllite)
wollastonite-Aabc (wollastonite)
wollastonite-M2abc (parawollastonite)


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