Result Type

You Searched For: Sedimentary Rocks

108  results were found

Gneiss

+ward’ssciencewardsci.com800-962-2660 Gneiss Type: Metamorphic; regional. Texture/Appearance: Foliated often with distinct banding (segregation) of minerals; some preferred orientation in micas (platy) or hornblende (prismatic crystals). Medium to...

Shale

+ward’ssciencewardsci.com800-962-2660 Shale Type: Sedimentary; clastic. Texture/Appearance: Very fine-grained (clay to silt-sized particles) grains not distinguishable to the naked eye. A relatively soft rock with fine laminae; may display carbona...

Quartzite

+ward’ssciencewardsci.com800-962-2660 Quartzite Type: Metamorphic; regional. Texture/Appearance: Massive with generally small grain size; sometimes saccharoidal. Grain size (sand size 1/16-2mm) dependent on original detritus. Generally non-foliate...

Gypsum

wardsci.com 800-962-2660 Gypsum CaSO4 • 2H2O Crystallography: Monoclinic; 2/m. Crystals commonly simple in habit; tabular on {010}; diamond- shaped with edges beveled by {120} and {111}. Twinning common on {100}. Also granular massive. Physical Pr...

Graywacke

wardsci.com 800-962-2660 Graywacke Type: Sedimentary; clastic. Texture/Appearance: Generally coarse-grained with angular to sub-angular poorly sorted grains in a clayey matrix. May show graded bedding; fossils are rare. Color: Gray to greenish-gra...

Breccia

wardsci.com 800-962-2660 Breccia Type: Sedimentary; clastic. Texture/Appearance: Coarse-grained angular rock fragments cemented in a fine- to very fine-grained matrix. Clasts have sharp edges. Color: Variable. Mineralogy/Chemistry: Composition var...

Arkose

+ward’ssciencewardsci.com800-962-2660 Arkose Type: Sedimentary; clastic. Texture/Appearance: Usually coarse-grained sometimes with pebbles. Angular to subangular poorly to moderately well-sorted sand grains. No Fossils. Color: Gray pink or reddish...

Greenstone

ward’s sciencewardsci.com800-962-2660 Greenstone Type: Metamorphic; regional. Texture/Appearance: Fine-grained massive or compact; generally non-schistose. Color: Dark green. Mineralogy/Chemistry: Mainly composed of chlorite actinolite epidote and...

Tuff

+ward’ssciencewardsci.com800-962-2660 Tuff Type: Igneous; extrusive (pyroclastic). Texture/Appearance: Clastic texture with angular rock and mineral fragments and lapilli mixed with fine-grained volcanic ash partly cemented by sedimentary material...

Dolostone

wardsci.com 800-962-2660 Dolostone Type: Sedimentary chemical. Texture/Appearance: Fine to coarsely crystalline grain size; sugary (saccharoidal). May contain various fossil relicts molds and casts. Stratification absent or irregular. Color: Light...

Siltstone

+ward’ssciencewardsci.com800-962-2660 Siltstone Type: Sedimentary; clastic. Texture/Appearance: Silt-sized (<1/16 mm) to very fine sand-sized particles; massive not laminated (no bedding planes) may exhibit significant clay or sand. Color: Tan gra...

Coal

wardsci.com 800-962-2660 Coal Type: Sedimentary; organic. Texture/Appearance: Peat is a brownish matted variety of coal consisting of partly decomposed plant remains seen as visible vegetable matter. Lignite is a darker more compact variety with p...

Conglomerate

+ward’ssciencewardsci.com800-962-2660 Conglomerate Type: Sedimentary; clastic. Texture/Appearance: Coarse-grained rock containing rounded to subangular clasts of greater than 2mm in diameter scattered in a finer-grained matrix of sand silt and/or ...

Metaconglomerate

+ward’ssciencewardsci.com800-962-2660 Metaconglomerate Type: Metamorphic regional. Texture/Appearance: Coarse-grained rock containing rounded to subangular clasts greater than 2mm in diameter and distributed in a fine-grained matrix or metamorphic...

Sandstone

+ward’ssciencewardsci.com800-962-2660 Sandstone Type: Sedimentary; clastic. Texture/Appearance: Grains generally sand-sized (1/16–2mm) normally sorted and somewhat rounded. May be poorly to well cemented. May also display visible fossils (not part...

Limestone

+ward’ssciencewardsci.com800-962-2660 Limestone Type: Sedimentary; chemical or clastic. Texture/Appearance: Fine to coarsely crystalline; varieties may be dense compact and graded to brecciated styliolitic or oolitic. Stratification usually indist...
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