| rock: | mudstone | ||
| |||
| type: | sedimentary - detrital | ||
| sediment: | silt | ||
| particle size: | <0.0039 mm | ||
| description: | Fine-grained detrital rock resulting from the compaction of mud with minor amounts clay and/or silt; lacks bedding planes and is massive; on fracture, mudstone breaks into blocky pieces; similar to shale in terms of particle size but distinguished from it by fracture; although fractures like siltstone, distinguished from the latter by smaller sediment size; typically the mud is made of clay minerals and mica; forms approximately half of all sedimentary rocks. | ||
| origin: |
| ||
| rock: | mudstone | ||
 | |||
Copyright Houghton Mifflin Company. All
Rights Reserved. | |||
