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! Characteristics
! Characteristics
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|-
| Sandstones
| colspan = 2 | Sandstones
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|-
| Primary intergranular
| Primary intergranular
| Interstitial void space between framework grains
| Interstitial void space between framework grains
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|-
| Dissolution or vug
| Dissolution or vug
| Partial or complete dissolution of framework grains or cement
| Partial or complete dissolution of framework grains or cement
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|-
| Micropores
| Micropores
| Small pores mainly between detrital or authigenic clays; can also occur within grains (e.g., microporous chert)
| Small pores mainly between detrital or authigenic clays; can also occur within grains (e.g., microporous chert)
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|-
| Fracture
| Fracture
| Breakage due to earth stresses
| Breakage due to earth stresses
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|-
| Carbonates
| colspan = 2 | Carbonates
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|-
| Interparticle
| Interparticle
| Pores between particles or grains
| Pores between particles or grains
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|-
| Intraparticle
| Intraparticle
| Pores within individual particles or grains
| Pores within individual particles or grains
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|-
| Intercrystal
| Intercrystal
| Pores between crystals
| Pores between crystals
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|-
| Moldic
| Moldic
| Pores formed by dissolution of an individual grain or crystal in the rock
| Pores formed by dissolution of an individual grain or crystal in the rock
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|-
| Fenestral
| Fenestral
| Primary pores larger than grain-supported interstices
| Primary pores larger than grain-supported interstices
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|-
| Fracture
| Fracture
| Formed by a planar break in the rock
| Formed by a planar break in the rock
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|-
| Vug
| Vug
| Large pores formed by indiscriminate dissolution of cements and grains
| Large pores formed by indiscriminate dissolution of cements and grains
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