Dataset description: This dataset contains semi-quantitative phase composition of variably altered samples from Whakaari (White Island) volcano, New Zealand. Column descriptions: 1. block_id: ID of the block from which samples were cored 2. sample_id: ID of the core sample 3. sample_type: Type of sample (Lava, Tuff, Breccia, Sulfur flow or Vesicular lava) 4. Plagioclase_pct: Amount of plagioclase in the sample (%) 5. Pyroxene_pct: Amount of pyroxene in the sample (%) 6. FeTiOxides_pct: Amount of Fe-Ti Oxides in the sample (%) 7. Alunite_pct: Amount of alunite in the sample (%) 8. Cristobalite_pct: Amount of cristobalite in the sample (%) 9. Tridymite_pct: Amount of Tridymite in the sample (%) 10. Sulphur_pct: Amount of native sulfur in the sample (%) 11. Pyrite_pct: Amount of pyrite in the sample (%) 12. Clay_pct: Amount of clays in the sample (%) 13. Anhydrite_pct: Amount of anhydrite in the sample (%) 14. actual_amorph_pct: Amount of amorphous phases in the sample (%) 15. amorph_phase_type: Type of amorphous phases in the sample (P-primary volcanic glass, S-secondary silica/aluminosilicates, PS- Primary volcanic glass and secondary silica/aluminosilicates) 16. other_phases_BSE: Other minor phases identified from backscattered-electron images and energy dispersive spectroscopy 17. alteration_intensity: Alteration intensity of the sample (Fresh-slightly altered, moderately altered, highly altered) 18. additional_notes: Additional notes pertaining to the sample block_id sample_id sample_type Plagioclase_pct Pyroxene_pct FeTiOxides_pct Alunite_pct Cristobalite_pct Tridymite_pct Sulphur_pct Pyrite_pct Clay_pct Anhydrite_pct actual_amorph_pct amorph_phase_type other_phases_BSE alteration_intensity additional_notes W1 W1-1 Lava 67 20 0 0 0 0 0 0 0 0 13 P "Anhydrite/Gypsum, Fe-Ti Oxide" Fresh-slightly altered W1 W1-2 Lava 67 20 0 0 0 0 0 0 0 0 13 P "Anhydrite/Gypsum, Fe-Ti Oxide" Fresh-slightly altered W2 W2-1 Sulfur flow 0 0 0 0 0 0 85 0 0 0 15 P "Detrital silica, Anhydrite/Gypsum" Fresh-slightly altered W2 W2-2 Sulfur flow 0 0 0 0 0 0 85 0 0 0 15 P "Detrital silica, Anhydrite/Gypsum" Fresh-slightly altered W3 W3-1 Sulfur flow 0 0 0 0 0 0 85 0 0 0 15 P "Detrital silica, Barite" Fresh-slightly altered W3 W3-2 Sulfur flow 0 0 0 0 0 0 85 0 0 0 15 P "Detrital silica, Barite" Fresh-slightly altered W3 W3-3 Sulfur flow 0 0 0 0 0 0 85 0 0 0 15 P "Detrital silica, Barite" Fresh-slightly altered W3 W3-4 Sulfur flow 0 0 0 0 0 0 85 0 0 0 15 P "Detrital silica, Barite" Fresh-slightly altered W4 W4-1 Breccia 0 0 0 46 3 0 0 0 0 0 50 S Highly altered W4 W4-2 Lava 22 12 0 8 3 0 0 0 9 0 45 PS Fe-Ti Oxides Highly altered W4 W4-3 Lava 22 12 0 8 3 0 0 0 9 0 45 PS Fe-Ti Oxides Highly altered W5 W5-1 Tuff 24 20 0 13 0 0 0 0 0 0 44 P "Silica, Pyrite" Moderately altered W5 W5-2 Tuff 24 20 0 13 0 0 0 0 0 0 44 P "Silica, Pyrite" Moderately altered W5 W5-3 Tuff 24 20 0 13 0 0 0 0 0 0 44 P "Silica, Pyrite" Moderately altered W5 W5-5 Tuff 24 20 0 13 0 0 0 0 0 0 44 P "Silica, Pyrite" Moderately altered W5 W5-6 Tuff 24 20 0 13 0 0 0 0 0 0 44 P "Silica, Pyrite" Moderately altered W6 W6-1 Lava 60 17 0 0 9 6 0 0 0 0 8 P "Fe-Ti Oxides, Clays" Moderately altered W6 W6-2 Lava 43 15 0 0 8 6 0 0 0 0 28 P "Fe-Ti Oxides, Clays" Moderately altered W6 W6-3 Lava 62 17 0 0 10 1 0 0 0 0 10 P "Fe-Ti Oxides, Clays" Moderately altered W6 W6-4 Lava 62 18 0 0 11 1 0 0 0 0 9 P "Fe-Ti Oxides, Clays" Moderately altered W6 W6-5 Lava 62 18 0 0 10 1 0 0 0 0 9 P "Fe-Ti Oxides, Clays" Moderately altered W7 W7-1 Lava 58 13 0 0 13 0 0 0 0 0 15 P "Anhydrite/Gypsum, Fe-Ti Oxide" Moderately altered W7 W7-2 Lava 58 13 0 0 13 0 0 0 0 0 15 P "Anhydrite/Gypsum, Fe-Ti Oxide" Moderately altered W7 W7-3 Lava 58 13 0 0 13 0 0 0 0 0 15 P "Anhydrite/Gypsum, Fe-Ti Oxide" Moderately altered W8 W8-1 Tuff 0 0 0 28 1 17 1 1 0 0 52 S Highly altered W8 W8-2 Tuff 0 0 0 28 1 17 1 1 0 0 52 S Highly altered W9 W9-1 Breccia 0 15 0 54 5 0 0 0 0 0 26 PS "Anhydrite/Gypsum, Pyrite" Highly altered W9 W9-2 Breccia 0 2 0 63 0 0 0 0 0 0 34 PS "Anhydrite/Gypsum, Pyrite, Silica" Highly altered W11 W11-1 Tuff 0 0 0 49 3 0 0 0 0 0 48 S "Fe-Ti Oxides, Clays" Highly altered W11 W11-2 Tuff 0 0 4 37 7 0 0 0 0 0 52 S Clays Highly altered W11 W11-3 Tuff 0 0 4 37 7 0 0 0 0 0 52 S Clays Highly altered W11 W11-4 Tuff 0 0 0 49 3 0 0 0 0 0 48 S "Fe-Ti Oxides, Clays" Highly altered W11 W11-5 Tuff 0 0 0 49 3 0 0 0 0 0 48 S "Fe-Ti Oxides, Clays" Highly altered W12 W12-1 Breccia 0 0 0 40 3 0 0 0 0 0 57 S Pyrite Highly altered W13 W13-1 Tuff 0 0 0 50 1 0 0 0 0 0 49 S Highly altered W13 W13-2 Tuff 0 0 0 50 0 0 0 0 0 0 50 S Highly altered W14 W14-1 Breccia 27 26 1 0 0 0 0 0 0 0 46 P "Silica, Pyrite" Moderately altered "Based on visual examniation during BSE imaging, this sample is classified as Moderately altered. The secondary alteration minerals may have gone undetected in XRD analysis due to the powder not being representative of the bulk composition." W15 W15-1 Tuff 0 0 0 18 18 6 0 3 0 16 39 S Highly altered W18 W18-1 Vesicular lava 42 24 0 0 0 0 0 0 0 0 35 P Fresh-slightly altered W18 W18-3 Vesicular lava 42 24 0 0 0 0 0 0 0 0 35 P Fresh-slightly altered W18 W18-4 Vesicular lava 41 23 0 0 0 0 0 0 0 0 36 P Fe-Ti Oxides Fresh-slightly altered W19 W19-1 Vesicular lava 41 27 0 0 0 0 0 0 0 0 32 P Clays Fresh-slightly altered W19 W19-2 Vesicular lava 41 27 0 0 0 0 0 0 0 0 32 P Clays Fresh-slightly altered W20 W20-1 Vesicular lava 27 25 1 0 0 0 0 0 0 0 47 P "Clays, Anhydrite/Gypsum" Fresh-slightly altered WS WS-1 Sulfur flow 0 0 0 0 0 0 92 0 0 0 8 P Fresh-slightly altered