Database fields in category Sample characteristics

Label	Statistics	Description
`FORMATION`		The name of the stratigraphic unit of formation rank or higher, represented by rock, mineral, or coal samples from the United States, Canada, or Mexico.
`DESCRIPTIO`		Description of the sample material provided by the submitter, indicating any distinguishing characteristics.
`CHARACTER_`		Indication of how typical sample is of an area and how it was collected
`SOURCE`		Type of source material or location
`AGE`		Age of the sample if known
`ROCK_FORM`		Type of rock formation from which sample was collected
`TEXTURE_ST`		Rock texture and structure
`QTZ_FELDSP`		Relationship between quartz and feldspar in the rock
`ROCK_NAME`		General rock classification
`ECON_GEOL`		Mineralization noted by geologist in sample. This field is used to identify samples of ores and (or) related protore, altered material, or other samples of possible economic significance.