I HATE THIS CLASS - Sedimentary rocks

kill me now

1. detrital/clastic

2. gravel > 2mm

3. rounded rock fragments and mineral grains

Conglomerate

1. detrital/clastic

2. gravel > 2mm

3. angular rock fragments and mineral grains

Breccia

1. detrital/clastic

2. sand 1/16mm-2mm

3. Abundant feldspar, rock fragments and mineral grains

Arkose sandstone 

1. detrital/clastic

2. sand 1/16mm-2mm

3. mostly quartz grains, grains oftan rounded

Quartz sandstone

1. detrital/clastic

2. sand 1/16mm-2mm

3. Abundant rock fragments, quarts and mineral grains

Lithic sandstone

1. detrital/clastic

2. clay/silt <1/16 m

3. mostly clay minerals

Shale 

1. chemical 

2. biochemical

3.  brown, visible plant fragments, easily fragmented 

4. plant fragments 

Peat

1. chemical 

2. biochemical

3. brown, to brownish black, brittle, sooty

4. carbonized plant fragments

Lignite

1. chemical 

2. biochemical

3. black to dark brown, brittle, fine bands, dull and shiny

4. carbonized plant fragments

Bituminous coal

1. chemical 

2. biochemical

3. fossilized shell in a fine grained matrix

4. calcite, limestone

Fossiliferous limestone

1. chemical 

2. biochemical

3. well sorted hash of shell fragments, porous, little visible matrix or cement 

4. calcite, limestone

Coquina

1. chemical 

2. biochemical

3. microscopic shells, powdery

4. calcite, limestone

Chalk

1. chemical 

2. biochemical

3. dull appearance, dense

4. calcite, limestone

Micrite

1. chemical 

2. inorganic 

3. spherical grains ooids

4. limestone

Oolitic Limestone

1. chemical 

2. inorganic 

3. Microcrystalline, often waxy appearance, conchoidal fracture, harder than glass, varies in color

4. quartz

Chert

1. chemical 

2. inorganic 

3. softer than fingernail, sugary appearance

Rock Gypsum

1. chemical 

2. inorganic 

3. crystalline, salty taste, softer than glass

4. Halite

Rock salt