Name that Sedimentary Rock Click the correct answers to learn your rock samples name.

Is it Coarse or Fine Grained? The rock is made of distinct pieces of rocks, sand, plants or shells. The rock is made of distinct pieces of rocks, sand, plants or shells. The rock is made of distinct pieces The rock is made of distinct pieces The rock looks like its made of pieces too small to see. The rock looks like its made of pieces too small to see. The rock looks like its made of pieces too small to see. The rock looks like its made of pieces too small to see. The rock is made of mineral crystals that precipitated from water solution. The rock is made of mineral crystals that precipitated from water solution. The rock is made of mineral crystals The rock is made of mineral crystals

Coarse Grained What are the pieces you see in your rock? Pebbles and larger rock bits Pebbles and larger rock bits Pebbles and larger rock bits Pebbles and larger rock bits Sand Sand Sand Plant fragments Plant fragments Plant fragments Plant fragments Shell fragments Shell fragments Shell fragments Shell fragments

Pebbles or Rocks Are the rock bits within your rock sample rounded, or angular? Smooth and rounded. Smooth and rounded. Smooth and rounded. Smooth and rounded. Sharp and angular. Sharp and angular. Sharp and angular. Sharp and angular.

Fine Grained What is your rock sample like? Made of flat layers, dull and soft, with a reddish, brown, grey, or blackish color. Made of flat layers, dull and soft, with a reddish, brown, grey, or blackish color. Made of flat layers, dull and soft Made of flat layers, dull and soft Light weight, black, dull and sooty to glassy luster, flammable. Light weight, black, dull and sooty to glassy luster, flammable. Light weight, black, dull and sooty to glassy luster, flammable. Light weight, black, dull and sooty to glassy luster, flammable. The rock fizzes in acid, lighter in color, H = 3. The rock fizzes in acid, lighter in color, H = 3. The rock fizzes in acid The rock fizzes in acid Glassy luster, hardness is seven, with a conchoidal (broken glass) fracture. Glassy luster, hardness is seven, with a conchoidal (broken glass) fracture. Glassy luster, hardness is seven, with a conchoidal (broken glass) fracture. Glassy luster, hardness is seven, with a conchoidal (broken glass) fracture.

Glassy Fine Grained What color is it? Darker red, brown, grey, or black color. Darker red, brown, grey, or black color. Darker red, brown, grey, or black color. Darker red, brown, grey, or black color. Lighter in color: white, tan, or light brown. Lighter in color: white, tan, or light brown. Lighter in color: white, tan, or light brown. Lighter in color: white, tan, or light brown.

Precipitated Crystalline Rock What are the crystals like? Monoclinic (tilted boxes), off-white, H = 3. Monoclinic (tilted boxes), off-white, H = 3. Monoclinic (tilted boxes), off-white, H = 3. Monoclinic (tilted boxes), off-white, H = 3. Cubes, transparent to dirty brown, H = 2.5 Cubes, transparent to dirty brown, H = 2.5 Cubes, transparent to dirty brown, H = 2.5 Cubes, transparent to dirty brown, H = 2.5 Acicular (long & narrow), off-white, H = 2. Acicular (long & narrow), off-white, H = 2. Acicular (long & narrow), off-white, H = 2. Acicular (long & narrow), off-white, H = 2.

Breccia Coarse grained Coarse grained Made of sharp pieces of other rocks. Made of sharp pieces of other rocks. –This rock formed near the place where the other rock weathered into pieces. Go Back Go Back

Conglomerate Coarse grained Coarse grained Made of rounded pebbles and rocks Made of rounded pebbles and rocks –This rock formed from other rock bits that weathered out and were worn smooth as they travelled a long distance in fast water. Go Back Go Back

Sandstone Coarse grained Coarse grained Made of sand Made of sand –This rock is made of sand. If you look at the sand grains, you can tell whether the sand was in a beach, a stream, a glacier, or a desert. Go Back Go Back

Coquina Made of shell pieces Made of shell pieces –This rock formed in warm, shallow ocean waters, somewhere below the low tide level. Go Back Go Back

Peat Made of plant pieces Made of plant pieces Soft and crumbly Soft and crumbly –This rock formed in a swamp or bog, where still water without much oxygen kept the plant remains from decaying completely. Go Back Go Back

Chert Fine grained Fine grained Hardness = 7 Hardness = 7 Conchoidal fracture Conchoidal fracture Lighter colors Lighter colors –This rock formed from dissolved quartz solutions. Go Back Go Back

Flint Fine grained Fine grained Hardness = 7 Hardness = 7 Conchoidal fracture Conchoidal fracture Darker colors Darker colors –This rock formed from dissolved quartz solutions. Go Back Go Back

Halite Cubic crystals to massive Cubic crystals to massive Transparent, clear to brownish. Transparent, clear to brownish. Hardness = 2.5 Hardness = 2.5 Rock salt. Rock salt. –This rock precipitated out when an ocean or salt lake dried up. Go Back Go Back

Calcite Monoclinic (crooked box) crystals Monoclinic (crooked box) crystals Hardness = 3 Hardness = 3 Transparent to dirty brown Transparent to dirty brown –This rock precipitated out from solutions, often in groundwater. Go Back Go Back

Gypsum Acicular (needle like) Acicular (needle like) Hardness = 2 Hardness = 2 White to dirty brown White to dirty brown –This rock formed from solutions, often in semi- arid regions. Go Back Go Back

Coal Black Black Massive or flat layers Massive or flat layers Sooty (lignite) to glassy (anthracite) Sooty (lignite) to glassy (anthracite) –This rock forms from compressed organic materials like peat. Go Back Go Back

Shale Dull and soft Dull and soft Flat layers or massive Flat layers or massive Dark colors. Dark colors. –This rock formed from clay minerals, usually in still water. Go Back Go Back

Limestone Dull Dull Hardness = 3 Hardness = 3 Fizzes in acid Fizzes in acid –This rock usually forms in fresh water or warm ocean water. Go Back Go Back