n
A very fine, pyrogenic form of silica.
adj
Of the nature of agate, or containing agate.
n
(geology) An alkaline variety of basalt.
n
Any of a class of metamorphic rock composed mainly of amphibole with some quartz etc.
n
(geology) Any of a class of metamorphic rock composed mainly of amphibole and olivine.
adj
(geology, of a soil) Containing weathered volcanic glass or pumice
n
A kind of soil formed in volcanic ash and containing high proportions of glass and amorphous colloidal materials, including allophane, imogolite and ferrihydrite.
adj
(geology, petrology) Pertaining to aphanites, igneous rocks composed of microscopic mineral crystals (fine grains too small to be visible to the naked eye.
adj
(geology) Of a rock sample: compact, crystalline and too fine-grained in texture for its constituents to be identifiable.
adj
(geology, soil science) Of or pertaining to clay or clay minerals.
adj
(soil science) Containing clay and iron.
n
Alternative form of atomic cocktail [(idiomatic, medicine) A drinkable liquid containing a radioactive substance, used in health care either as a diagnostic aid or as a treatment, especially for cancer of the thyroid.]
n
(mineralogy) A hard mafic igneous rock of varied mineral content; volcanic in origin, which makes up much of the Earth's oceanic crust.
n
Obsolete form of basalt. [(mineralogy) A hard mafic igneous rock of varied mineral content; volcanic in origin, which makes up much of the Earth's oceanic crust.]
adj
(obsolete) Consisting of, or resembling, basalt.
n
(geology) A basaltic extrusive rock, similar to chert.
n
(geology) A form of limestone consisting of bioclasts in a micrite matrix
n
(geology) A form of biomicrite composed of very small fragments
n
(geology) A limestone similar to biosparite
n
(geology) A limestone composed of less than 25% oolites and less than 25% intraclasts
adj
Pertaining to, consisting of, or containing blende.
n
(geology) A metamorphic rock containing glaucophane.
adj
Of or relating to breccia.
n
(geology) A form of metamorphosed argillaceous limestone that has a schistose structure
n
(geology) A mixed rock whose fabric is of visually uneven textures and which is composed of dissimilar types of materials with varied origins.
n
(geology) A sedimentary rock composed mostly of volcanic ash
adj
(mineralogy) Having a rounded, finely banded texture formed by rhythmic precipitation.
adj
(mineralogy, of a mineral) That fractures with planar concentric curves (e.g., as flint, chert or obsidian).
adj
(geology) Alternative form of conglomeratic [(geology) Of or pertaining to a conglomerate.]
adj
(mineralogy) Containing, or abounding in, culm or glance coal.
adj
(geology) Composed of detritus
n
(petrology) A kind of metamorphic rock that contains diaspore.
n
(geology) A fine, powdery earth formed from the skeletons of diatoms
adj
(geology) Relating to, or composed of diatomites
n
(geology) A dolomite mudstone.
adj
(mineralogy) Having a druse.
adj
Of or relating to dunite.
adj
(mineralogy) Having imperfect fracture or cleavage.
n
(petrology, uncommon) A type of migmatite where the crystal structures of the rock before metamorphism are partially preserved.
adj
(geology) Describing rock formed from fragments of volcanic rock that have been moved to another place.
adj
(geology) Above a metamorphic stratum
adj
(geology) Flowing from a basin
adj
(mineralogy) Having chinks or openings; rimose.
adj
(of a rock) Having feldspathoids.
n
A rock with such properties.
adj
(soil science, of soil) That is low in silica (and high in iron minerals) as a result of weathering
adj
(geology) Siliceous (including basanite).
n
(petrology, colloquial) a rock that has been brecciated, metamorphosed, or otherwise transformed to the point where its origin cannot be recognized
adj
(geology) Bearing globules; of rocks, having a concretionary structure where the concretions are isolated globules evenly distributed through the texture of the rock.
adj
(geology) Describing porphyritic igneous rock in which phenocrysts are clustered in irregular groups
n
(geology) granitic gneiss
n
(geology) A metamorphic rock having the composition of a laminated granite
adj
(geology) Resembling granite.
adj
(geology) Containing equidimensional grains of metamorphic rock formed by recrystallization
adj
(petrology) Having a texture resembling that of classic granophyre.
n
(geology) alternative form of greenschist [(petrology) A metamorphic rock formed at low temperature and pressure, often with an abundance of green minerals such as chlorite, serpentine, and epidote.]
n
(petrology) A metamorphic rock formed at low temperature and pressure, often with an abundance of green minerals such as chlorite, serpentine, and epidote.
n
(geology) A highly altered granitic rock containing quartz and mica.
adj
(geology) Completely glassy.
n
Any of a series of contact metamorphic rocks that have been baked and indurated by the heat of intrusive igneous masses and rendered massive, hard, splintery, and in some cases exceedingly tough and durable.
adj
(geology, rare) igneous
n
Any rock created or modified by the impact of a meteorite.
n
(countable, mineralogy) Any material that is trapped inside a mineral during its formation, as a defect in a precious stone.
adj
(soil science) Being or relating to a soil horizon with an accumulation of iron and aluminium oxides and low-activity silicate clays.
n
(geology) An uncommon, small-volume ultrapotassic igneous rock primarily occurring as dikes, lopoliths, laccoliths, stocks and small intrusions.
adj
Like lava, or composed of lava; lavic.
n
(attributive) Pertaining to or made of limestone.
n
(chemistry, materials design) lithate
n
(geology) A lithic fragment: a piece of another rock eroded down to sand size.
n
(geology) Any rock whose grains are large enough to be visible to the naked eye
n
(geology) A rock composed of a mosaic of relatively large pieces of a mineral, typically quartz
n
A rock with such properties.
adj
(mineralogy) Not having an obvious crystalline structure.
n
An amphibolite produced from a basalt by metamorphism.
n
(geology) A metamorphosed form of a basalt, dolerite or similar rock
n
A porphyroblast produced by metamorphic recrystallization
n
(geology) metamorphosed dolerite
n
Alternative spelling of metagreywacke [A greywacke that has undergone metamorphism to some degree.]
n
A greywacke that has undergone metamorphism to some degree.
n
(mineralogy) A mineral with a disrupted crystal structure due to radiation damage.
adj
(mineralogy, of a radioactive mineral) Having a disrupted crystal structure due to radiation damage
n
(geology) A metamorphosed pelite rock
n
A sandstone that has undergone metamorphism to some degree.
n
(petrology) A metamorphosed sedimentary rock.
n
(geology) A metasomatic rock.
n
(geology) Any rock of mixed appearance, being an intimate mixture of granite and older rock, specifically from intense metamorphism which partially melts the rock, causing it to recrystallize in a state intermediate between igneous and metamorphic.
n
(geology) A building stone, one of the group of the Paris basin, almost entirely made up of many-chambered microscopic shells.
adj
(geology) Pertaining to, or containing, a molasse.
n
(geology) A migmatite formed by partial melting of an existing rock
adj
(geology, of a soil) Having a reasonable amount of clay, but that falls apart into flat-edged geometrical forms that have shiny faces
adj
(soil science) Either too thin, too light in colour, or too low in organic matter to be considered either mollic or umbric.
n
(geology) A gneiss derived from an igneous rock.
n
(geology) A gneiss derived from a sedimentary rock.
adj
(geology) Describing a weathered rock that is not soft or loose
n
(mineralogy) The mineral substance in which other minerals are embedded.
n
(geology) A sedimentary rock containing very fine particles.
n
(petrology) allochems composed of micrite
adj
(soil science) Composed of hardened material containing significant amounts of iron
adj
Alternative form of petrosilicious [Containing or relating to petrosilex.]
adj
(geology) evident; visible
adj
(geology) formed of minerals that can be distinguished with the naked eye
n
(geology) A type of metamorphic rock formed from clay-rich sediments called pelites.
n
(geology) A sedimentary rock formed from pisoids
adj
(geology) Describing the texture of an igneous rock that has small crystals of one mineral scattered among larger crystals of another
adj
(geology) Describing a crystalline sedimentary rock having multisized crystals the larger of which enclose small ones, often of a different mineral
adj
Pertaining to porphyry.
n
(geology) a hard igneous rock consisting of large crystals in a fine-grained matrix
n
(geology) The original precursor of any specified metamorphic rock
n
A rock that is believed to be a meteorite, but is in fact terrestrial in origin.
adj
Of or relating to pyrobitumen.
n
A kind of diagram used to classify igneous rocks based on their mineral composition.
n
(geology) A metamorphosed schist composed mostly of quartz with some mica and/or tourmaline.
adj
Pertaining to quartz; made of quartz.
adj
Pertaining to quartz; made of quartz.
adj
(geology) Having the character of schist.
adj
Containing or composed of schist; resembling schist; (of a wine) having a mineral aroma resembling that of schist
adj
Pertaining to, or containing, sediment.
n
(geology) a metamorphic rock composed of serpentine minerals formed by the hydration of ultramafic rocks
adj
(chemistry) Of, relating to, consisting of, or resembling silica or silicates.
adj
(geology) Describing clastic rocks that bear quartz or similar silicate minerals
adj
Alternative spelling of siliceous [(chemistry) Of, relating to, consisting of, or resembling silica or silicates.]
adj
Consisting of or resembling stalactites.
adj
(geology) deposited in a marsh or swamp
n
(geology) An extrusive igneous rock with a composition between that of trachyte and andesite
n
(geology) trachytic phonolite
adj
Of the nature or texture of tufa.
adj
(geology) Describing igneous rocks that contain magnesium and iron and only a very small amount of silica, such as are found in the Earth’s mantle.
n
(geology) ultramafic rock
adj
Alternative form of ultramafic [(geology) Describing igneous rocks that contain magnesium and iron and only a very small amount of silica, such as are found in the Earth’s mantle.]
adj
(geology) (of igneous rock) Having minerals without free silica
n
(geology) A volcanic arenite
n
A metamorphic rock formed in high-pressure environments, composed principally of talc and kyanite.
adj
Of, pertaining to, containing, or produced using a zeolite.
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