Sedimentary Rock

 

Detrital

Grain

Check:

Size (mm)

Grain Name

Description

__

2 or larger

Gravel

__ Grains rounded

__ Grains angular

__

1/16 to 2

Sand

Like sandpaper

__

1/256 - 1/16

Silt

Feels gritty, grains barely detectable

__

less than 1/256

Clay

__ Grains detected only with magnifier.
__ No grains detected.

If clay or silt, then: __ Layered; __ Not layered

Date collected,
locality of origin
(attach a description, sketch,
or photograph of surroundings)

 

 

Classification

__ Detrital (clastic)
__ Organic
__ Inorganic chemical

Reacts with HCl?
__ yes; __ no

Color:

 

Organic

Composition

__ Calcite
__ Plant matter
__ Chert
__ Other:

 

Physical Properties

__ Cemented in compact matrix
__ Porous matrix
__ Shells visible with unaided eye
__ Shells visible only with magnifier
__ Shells not visible
__ Other:

Other observations

 

 

 

 

 

Inorganic Chemical

Mineral Composition

Mineral

Physical Properties

__ Halite

x

__ Gypsum

x

__ Calcite

x

__ Dolomite

x

__ Quartz

x

__ Other:

x

Rock Properties

Observable Crystals?

 

Grain: coarse, medium, fine

Other:

 

 

Remarks, uses