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Definitions Are Largely Based on Input From Reference: Arild Palmström / www.rockmass.net GLOSSARY OF TERMS IN ENGINEERING GEOLOGY AND ROCK MECHANICS Updated November 2019 The definitions are largely based on input from: • ISRM Terminology (1975) • Handbook in Engineering geology and rock mechanics, issued by the Norwegian Rock Mechanics Group (NBG), (2000); • Geoguide 3 (1988), issued by the Geotechnical Engineering Office, Hong Kong; • Common textbooks in rock mechanics, rock engineering and engineering geology; • Webster’s dictionary; • Dictionary of geological terms, issued by American Geological Institute; • Encyclopædia Britannica. • Wikipedia 1. abutment The point in a tunnel or cavern where the wall and roof (back) meet. 2. access tunnel Tunnel from surface to underground work site. 3. accessory A term applied to minerals occurring in small quantities in a rock, and whose presence or absence does not affect its mechanical properties. 4. acid Chemical term for an igneous rock containing more than 62% silica and usually less than 20% dark minerals. (Contrast with "intermediate" and "basic"). 5. actinolite Mineral. A monoclinic variety of amphibole. 6. activity (of a soil) Ratio of plasticity index to clay fraction. 7. adit Tunnel (gallery) driven from a surface portal to an underground working place. Used for drainage, ventilation, transportation, or giving access to an ore body or working place. Also used as a term for a small investigation tunnel. 8. aegirine Mineral. A variety of monoclinic pyroxene. 9. aeolian A term applied to deposits whose constituents have been carried by, and laid down from, the wind. 10. agglomerate Pyroclastic rock composed predominantly of rounded bombs of material of greater than 60mm average dimension. (Contrast with "pyroclastic breccia"). 11. aggregate 1) A mixture of different materials which may be separated mechanically. 2) Mineralogic material (i.e. sand gravel, crushed rock etc) which may be mixed with cement, bitumen or epoxy to form concrete or asphalt. 12. aggregate abrasion value A measure of the resistance of an aggregate to abrasion; the lower value, the more resistant to abrasion is the aggregate. 13. aggregate soundness test A chemical test to measure the relative resistance of rocks to repeated wetting and drying and crystallisation of salts within pores. 14. albite Mineral. The most sodium rich variety of pyroxene feldspar (NaAlSi3O8). 15. alkali feldspar Group of feldspars composed of mixtures, or mixed crystals, of potassium feldspar (KAlSi3O3) and sodium feldspar (NaAlSi3O8). (See "feldspar"). 16. allochthonous rocks Rocks having been thrusted in connection with mountain range formation. 17. alum schist A black shale variety containing pyrrhotite. 18. alluvium Detrital material of any grain size transported and deposited during comparatively recent geological time by a river or stream. 19. alteration Change of the mineralogical composition of a rock, typically brought about by the action of hydrothermal solutions. The term joint alteration includes both weathering and alteration. It is included in the description of joint alteration in the following main categories: - the alteration of the rock in the joint wall/surface; - the coating on the joint surface when it occurs; and - the filling in joints with separation. 1 February 2013 Reference: Arild Palmström / www.rockmass.net 20. amorphous Term for a mineral or other substance that lacks crystalline structure and has no characteristic external form. 21. amphiboles A group of rock-forming minerals. 22. amphibolite Homogeneous to slightly schistose, dark, metamorphic rock with 20 - 50 % plagioclase, 20 - 80 % amphibole, 0 - 50 % mica, minor amounts of quartz, garnet and epidote. 23. amphibolitic gneiss Gneiss with > 20 % amphibole. 24. andalusite Brown, yellow, green, red or grey silicate mineral which occurs in thick, nearly square prisms in schists, gneisses and hornfelses. 25. andesite A fine-grained igneous rock formed essentially of plagioclase, together with the mafic minerals biotite, hornblende, and pyroxene (the effusive rock of diorite). 26. angular Shape term for a rock particle with sharp edges and corners. 27. anhydrite White or light-coloured mineral consisting of calcium sulphate (CaSO4). Essentially a slightly harder and less soluble form of gypsum. 28. anisotropy Characterises a material which has different properties in different directions. 29. anorthite Mineral. The most calcium rich variety of plagioclase feldspar 30. anorthosite A plutonic rock composed almost entirely of plagioclase. 31. anthophyllite Mineral. A variety of rhombic amphibole. 32. anticline Fold in the form of an arch whose core contains the stratigraphically older rocks. 33. antiform Fold with the convex side up (may be inverted, as opposed to anticline). 34. anthracite Pure, high quality coal. 35. aperture Perpendicular distance between adjacent rock walls of a discontinuity, in which the intervening space is air or water filled. 36. aphanitic Textural term for a rock in which the individual constituents are not visible to the naked eye. 37. aplite Light-coloured, fine-grained igneous rock of granitic composition. Very uniform and smooth- textured appearance. Commonly occurs in the form of narrow dykes. 38. aquiclude A (relatively) impermeable barrier to groundwater flow. 39. aquifer Permeable layer of water bearing ground. 40. arenaceous Applied to rocks that have been derived from sand or that contain sand. 41. arenite 1) Consolidated rock of the texture of sand, irrespective of composition; see psammite. 2) Arenaceous sedimentary rock containing less than 15% silt and clay material. (Contrast with "wacke"). 42. argillaceous Applied to all rocks composed of clay or having notable portion of clay in their composition, as roofing slate, shale, etc. 43. arkose Sedimentary rock. Sandstone with 0 - 75 % quartz, 10 - 90 % feldspar and rock fragments, 0 - 20 % clay minerals. 44. arkosite Schistose to slightly schistose, metamorphic rock with 0-70 % quartz, 10 - 90 % feldspar, 0 - 30 % mica and chlorite. (Metamorphic variant of arkose). 45. artesian Relating to a confined aquifer (usually one for which the pressure surface is above ground level) 46. ash Pyroclastic rock material of sand-, silt- and clay-size (i.e. < 2mm), subdivided into coarse ash for sand-size and fine ash for silt- and clay-size. Descriptive term for tuff composed wholly or predominantly of these grain sized. 47. astenosphere The part of the Earth's mantle beneath the lithosphere. 48. augen gneiss Gneiss with feldspar appearing as eyes in the bedrock. 49. augite Dark-coloured silicate mineral in the pyroxene group often found in basic igneous rocks. 50. aureole Zone surrounding an igneous intrusion in which the country rock shows the effects of thermal or contact metamorphism. 51. authigenic Formed where found (used of mineral particles of rocks formed by crystallisation in the place they occupy) 52. autochtonous rocks Rocks not having been thrusted in connection with mountain range formation. 2 February 2013 Reference: Arild Palmström / www.rockmass.net 53. axial plane Plane that connects the points of maximum curvature of the bedding planes or other structural rock surfaces in a fold. 54. banded Structural term for a rock with alternating layers of material of differing colour or texture, possibly of differing mineral composition also. 55. bar block See columnar block 56. basal Pertaining to, situated at, or forming the base of a geological structure. "Basal layer" refers to the lowest layer in a layered rock or soil. 57. basalt Dark coloured, fine-grained igneous rock composed mainly of plagioclase feldspar and mafic minerals. Often occurs in the form of lave flows. (The fine-grained equivalent of gabbro.) 58. basic Chemical term for an igneous rock containing 44 to 54% silica and usually more than 30% dark minerals. (Contrast with "acid" and "intermediate"). 59. batholith A body of plutonic igneous rock, usually greater than 80 km2 (sometimes many thousand km2 in surface area) 60. bauxite Residual soil layer relatively rich in aluminium oxide, which is formed in tropical area of high rainfall. 61. bedded Structural term for a sedimentary rock or superficial deposit formed, arranged or deposited in layers or beds > 20 mm thick. 62. bedding joint Joint along bedding plane in a sedimentary rock. 63. bedrock Solid rock underlying soil, sand and other unconsolidated material. 64. bentonite An expansive clay formed from the decomposition of volcanic ash. 65. bias The difference between the estimated value and the true value based on statistically random sampling. 66. bit wear index A number representing the wear on drill bits during boring. It is found from laboratory tests by combining the drilling rate value (DRI) and the abrasion-value. 67. biotite Black, dark brown or dark green mineral of the mica group. Forms distinctive shiny thin prisms or flakes. Very common in crystalline, igneous and metamorphic rocks. 68. black cotton soil A dark clay soil which shrinks and cracks in dry weather. 69. blastability Index value of the resistance of a rock mass to blasting. 70. black shale Sedimentary or slightly metamorphic, schistose rock containing graphite. 71. block 1) Rock fragment derived from the sides of a volcanic vent. Commonly angular or subangular. Restricted to pyroclasts > 60mm diameter. 2) General term for individual pieces of rock bounded by discontinuities in a rock mass. 72. block angles The angles between the sides of the block (orthogonal, oblique, acute, rhomboedric etc.). 73. block shape factor
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