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. Author manuscript; available in PMC: 2018 Aug 16.

Published in final edited form as: Geochem Geophys Geosyst. 2016 Jan 11;17(2):300–323. doi: 10.1002/2015GC006091

Tabel 3.

Comparison of Analytical Results for Mineralogy

Technique	Scale	Bastille	Dante	Hot Harold
Petrography	Microscale, all	Marcasite,^a pyrite,^a chalcopyrite,^a sphalerite,^a silica,^b barite,^b and anhydrite^b	Anhydrite,^a pyrite,^a pyrrhotite,^a sphalerite,^a wurtzite,^a and iron oxide^b	Not available due to small sample size
Elemental analysis	Bulk, all	Relatively abundant Fe, Ba, and SiO₂; Cu and Al₂O₃ high in inner wall; Zn high in outer wall	CaO high in inner wall, Fe high in outer wall	Relatively abundant CaO
X-ray diffraction	Bulk, interior	Pyrite,^a marcasite,^a chalcopyrite,^a and gypsum^b	Anhydrite,^a pyrite,^a gypsum,^b and sulfur^b	Anhydrite,^a and gypsum^b
VNIR reflectance spectroscopy	Bulk, interior	Chalcopyrite and/or pyrite,^a mica,^b and chlorophyll-a^b	Anhydrite,^a chalcopyrite and/or pyrite,^a gypsum,^b and chlorophyll-a^b	Anhydrite,^a gypsum,^b sphalerite, and/or pyrite^b, possibly sulfur^b
Thermal emission spectroscopy	Bulk, interior	Chalcopyrite and/or pyrite^a	Gypsum,^a and pyrite^b	Anhydrite^a
Mössbauer spectroscopy	Bulk, interior	Chalcopyrite (sextet),^a possible pyrite, sphalerite, marcasite (doublet)	Possible pyrite, sphalerite, marcasite (doublet), possible ferricopiapite, lepidocrocite, maybe schwertmannite (sextets)	Too little Fe to identify minerals

^aMajor component.

^bMinor component.