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Sedimentary Rock Specimens


Rocks and Minerals





Sedimentary rocks are formed at or near the surface of the earth. Most of these sediments are deposited in beds or layers by water or wind as a result of weathering (erosion). Sedimenary rocks can be classified by their mode of origin as clastic, chemical or organic.

Clastic sedimentary rocks like sandstone are composed of rock fragments or mineral grains broken from any type of pre-existing rock. Chemical sedimentary rocks like gypsum result from precipitation of dissolved materials in fresh or salt water. Organic sedimentary rocks like coal form from accumulation plant or animal debris.

Rockman's sedimentary rock specimens are hand broken as opposed to being crushed which helps keep cleavage and fracture characteristics intact. This is a partial listing. If you are looking for a specimen that is not listed, please contact us, we may have it in stock or we may be able to locate it.


We offers the 3 standard sizes of sedimentary rocks as illustrated:

small hand

Small – 0.75" to 1.2"
10 pieces in resealable bag.
large hand

Large – 2" x 3" up to 3" x 4"
ONE (1) boxed piece.
medium hand

Medium – 1.25" to 1.75"
10 pieces in resealable bag.

Argillite (red to brown)

  • 10 Pack - Small [RS005b]
  • 10 Pack - Medium [RS005c]
  • 1 Large Sample [RS005d]
Item Number


Arkose (red, coarse grained)

  • 10 Pack - Small [RS010b]
  • 10 Pack - Medium [RS010c]
  • 1 Large Sample [RS010d]
Item Number


Breccia (angular fragments cemented together)

  • 10 Pack - Small [RS031b]
  • 10 Pack - Medium [RS031c]
  • 1 Large Sample [RS031d]
Item Number


Bituminous Coal

  • 10 Pack - Small [RS030b]
  • 10 Pack - Medium [RS030c]
  • 1 Large Sample [RS030d]
Item Number


Lignite Coal (soft in bags)

  • 10 Pack - Small [RS035b]
  • 10 Pack - Medium [RS035c]
  • 1 Large Sample [RS035d]
Item Number


Conglomerate (mixed pebbles)

  • 10 Pack - Small [RS050b]
  • 10 Pack - Medium [RS050c]
  • 1 Large Sample [RS050d]
Item Number


Dolomite Rock (light to white, granular)

  • 10 Pack - Small [RS060b]
  • 10 Pack - Medium [RS060c]
  • 1 Large Sample [RS060d]
Item Number


Greywacke (limited supply)

  • 10 Pack - Small [RS073b]
Item Number


Loess (fine wind-blown glacial sediments)

  • 1 Large Sample [RS075d]
Item Number


Limestone (compact, fine-grained)

  • 10 Pack - Small [RS080b]
  • 10 Pack - Medium [RS080c]
  • 1 Large Sample [RS080d]
Item Number


Limestone - Chalk

  • 10 Pack - Small [RS081b]
  • 10 Pack - Medium [RS081c]
  • 1 Large Sample [RS081d]
Item Number


Limestone - Coquina

  • 10 Pack - Small [RS082b]
  • 10 Pack - Medium [RS082c]
  • 1 Large Sample [RS082d]
Item Number


Limestone - Fossiliferous

  • 10 Pack - Small [RS083b]
  • 10 Pack - Medium [RS083c]
  • 1 Large Sample [RS083d]
Item Number


Limestone - Oolitic (small ooids visable)

  • 10 Pack - Small [RS085b]
  • 10 Pack - Medium [RS085c]
  • 1 Large Sample [RS085d]
Item Number


Oolite (massive, cemented)

  • 10 Pack - Small [RS087b]
  • 10 Pack - Medium [RS087c]
  • 1 Large Sample [RS087d]
Item Number


Phosphorite (contains high amounts of phosphate)

  • 10 Pack - Small [RS090b]
  • 10 Pack - Medium [RS090c]
Item Number


Rock Salt (white to red granular)

  • 10 Pack - Small [RS100b]
  • 10 Pack - Medium [RS100c]
  • 1 Large Sample [RS100d]
Item Number


Sandstone (banded, with layering)

  • 10 Pack - Small [RS120b]
  • 10 Pack - Medium [RS120c]
  • 1 Large Sample [RS120d]
Item Number

Sandstone (gritty, yellow-brown,ferruginous)

  • 10 Pack - Small [RS110b]
  • 10 Pack - Medium [RS110c]
  • 1 Large Sample [RS110d]
Item Number


Sandstone (red, fine-grained)

  • 10 Pack - Small [RS115b]
  • 10 Pack - Medium [RS115c]
  • 1 Large Sample [RS115d]
Item Number


Sandstone (siliceous, gray to white)

  • 10 Pack - Small [RS125b]
  • 10 Pack - Medium [RS125c]
  • 1 Large Sample [RS125d]
Item Number


Shale (bituminous, black)

  • 10 Pack - Small [RS127b]
  • 10 Pack - Medium [RS127c]
  • 1 Large Sample [RS127d]
Item Number


Shale (black to dark gray, carbonaceous)

  • 10 Pack - Small [RS128b]
  • 10 Pack - Medium [RS128c]
  • 1 Large Sample [RS128d]
Item Number


Shale (gray, calcareous)

  • 10 Pack - Small [RS129b]
  • 10 Pack - Medium [RS129c]
  • 1 Large Sample [RS129d]
Item Number


Shale (red, argillaceous)

  • 10 Pack - Small [RS130b]
  • 10 Pack - Medium [RS130c]
  • 1 Large Sample [RS130d]
Item Number


Shale (tan)

  • 10 Pack - Small [RS132b]
  • 10 Pack - Medium [RS132c]
  • 1 Large Sample [RS132d]
Item Number


Oil Shale (brown, trapped oil)

  • 10 Pack - Small [RS135b]
  • 10 Pack - Medium [RS135c]
  • 1 Large Sample [RS135d]
Item Number


Siltstone (tan or gray)

  • 10 Pack - Small [RS140b]
  • 10 Pack - Medium [RS140c]
  • 1 Large Sample [RS140d]
Item Number


Tufa (calcium carbonate percipitate)

  • 10 Pack - Small [RS141b]
  • 10 Pack - Medium [RS141c]
  • 1 Large Sample [RS141d]
Item Number


Travertine (less porous than tufa)

  • 10 Pack - Small [RS142b]
  • 10 Pack - Medium [RS142c]
  • 1 Large Sample [RS142d]
Item Number




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