| Abbe | xxv xxvii |
| Aberdeenshire | 30 53 |
| Abrasives | ii |
| ACHESON | ii |
| Acid instrusives | 47 |
| Acid, lavas | 31 50 |
| Acid, nitric | xx |
| Acid, sulphuric | xx |
| Acmite | 27 28 |
| Actinolite | 2 29 30 53 57 61 62 |
| Adjustable drawing-table | xxvii |
| ADYE | 10 14 24 43 |
| Aegirine | 25 26 27 28 51 |
| Air-bubbles | 50 |
| Albite | 68 |
| Albite, lamellation | 2 12 14 16 29 34 36 38 53 60 67 |
| Alcyonarian | 4 |
| Aldous quarry | 11 |
| Algae | 4 48 |
| Allothigenous | 19 |
| Allotriomorphic | 1 24 41 47 49 51 55 58 66 |
| ALLPORT | 16 23 24 33 38 45 62 70 |
| Alteration | 52 |
| Aluminium | 60 |
| Amateur's lapidary machine | ii |
| Amorphous matter | 46 |
| Amphibole, grammatitic | 24 |
| Amphibole, soda | 47 |
| Andes | 67 |
| Andesine | 67 68 70 |
| Andesite, hornblende | 67 |
| Anglesey | 39 |
| Ankerite | 64 |
| Annelid-tubes | 20 |
| Anorthite | 14 30 68 |
| Anorthoclase | 61 |
| Anthocyrtis | 56 |
| Anticlinal arches | 40 |
| Antilles | 56 |
| Antrim | xxi 50 |
| Apatite | 1 8 11 12 15 16 23 24 37 38 42 45 46 49 51 53 59 60 65 67 68 69 70 |
| Apophysis | 65 |
| Aragonite | 18 72 |
| Argillaceous | 44 52 |
| Argyllshire | 42 |
| Arm o'Grain | 1 |
| ARNOLD-BEMROSE | 14 |
| Arran | 33 61 |
| Arthur's Seat | 13 |
| Artificially indurated rocks | xxi |
| Artist's saucers | ix |
| Assouan | 49 65 |
| Astromma | 56 |
| Astrorhizidae | 5 |
| Atlantic | xix 4 56 |
| "Augen-structur" | 52 54 |
| Augite | 1 2 7 8 9 13 14 15 16 23 24 37 41 42 43 45 46 49 57 58 61 65 66 67 68 |
| Augite, picrite | 7 |
| Augite, syenite | 49 |
| Augite, trachyte | 46 |
| Austria | 48 |
| Authigenous | 19 |
| Avon | 18 |
|
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