Arkose

arkosicarkose sandstoneArkosic sandarkosic sandstonearckosicfeldspar-richquartz-arkosesub-arkosic
Arkose is a detrital sedimentary rock, specifically a type of sandstone containing at least 25% feldspar.wikipedia
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Sedimentary rock

sedimentarysedimentary rockssediments
Arkose is a detrital sedimentary rock, specifically a type of sandstone containing at least 25% feldspar.
Although the Dott classification scheme is widely used by sedimentologists, common names like greywacke, arkose, and quartz sandstone are still widely used by non-specialists and in popular literature.

Sand

sand grainsandybeach sand
Arkosic sand is sand that is similarly rich in feldspar, and thus the potential precursor of arkose.
Arkose is a sand or sandstone with considerable feldspar content, derived from weathering and erosion of a (usually nearby) granitic rock outcrop.

Sandstone

sandstonesred sandstoneSandstein
Arkose is a detrital sedimentary rock, specifically a type of sandstone containing at least 25% feldspar.

Uluru

Ayers RockUluṟuUluru/Ayers Rock
The central Australian inselberg Uluru (Ayers Rock) is composed of late Neoproterozoic/Cambrian arkose, deposited in the Amadeus Basin.
For the purpose of mapping and describing the geological history of the area, geologists refer to the rock strata making up Uluru as the Mutitjulu Arkose, and it is one of many sedimentary formations filling the Amadeus Basin.

Grus (geology)

grussharp sandweathered granite
Arkose is generally formed from the weathering of feldspar-rich igneous or metamorphic, most commonly granitic, rocks, which are primarily composed of quartz and feldspar (called 'grus' as a sand).
Grus sand, when cemented into a sandstone, will form an arkose.

Detritus (geology)

detritaldetritusgeological detritus
Arkose is a detrital sedimentary rock, specifically a type of sandstone containing at least 25% feldspar.

Feldspar

alkali feldsparfeldspathicfeldspars
Arkose is a detrital sedimentary rock, specifically a type of sandstone containing at least 25% feldspar.

Quartz

rock crystalquartz crystalcitrine
Quartz is commonly the dominant mineral component, and some mica is often present.

Mica

micaceousmicasMica group
Quartz is commonly the dominant mineral component, and some mica is often present.

Calcite

calcareouscalciticcalcite crystals
Arkose usually contains small amounts of calcite cement, which causes it to fizz slightly in dilute hydrochloric acid; sometimes the cement also contains iron oxide.

Hydrochloric acid

HClhydrochloricmuriatic acid
Arkose usually contains small amounts of calcite cement, which causes it to fizz slightly in dilute hydrochloric acid; sometimes the cement also contains iron oxide.

Iron oxide

iron oxidesiron hydroxideferruginous
Arkose usually contains small amounts of calcite cement, which causes it to fizz slightly in dilute hydrochloric acid; sometimes the cement also contains iron oxide.

Fossil

fossilsfossil recordfossilized
Fossils are rare in arkose, due to the depositional processes that form it, although bedding is frequently visible.

Bed (geology)

beddingbedsbedding plane
Fossils are rare in arkose, due to the depositional processes that form it, although bedding is frequently visible.

Igneous rock

igneousigneous rocksdecompression melting
Arkose is generally formed from the weathering of feldspar-rich igneous or metamorphic, most commonly granitic, rocks, which are primarily composed of quartz and feldspar (called 'grus' as a sand).

Metamorphic rock

metamorphicmetamorphosedmetamorphic rocks
Arkose is generally formed from the weathering of feldspar-rich igneous or metamorphic, most commonly granitic, rocks, which are primarily composed of quartz and feldspar (called 'grus' as a sand).

Granite

graniticgranitespink granite
Arkose is generally formed from the weathering of feldspar-rich igneous or metamorphic, most commonly granitic, rocks, which are primarily composed of quartz and feldspar (called 'grus' as a sand).

Weathering

weatheredchemical weatheringweather resistant
These sediments must be deposited rapidly and/or in a cold or arid environment such that the feldspar does not undergo significant chemical weathering and decomposition; therefore arkose is designated a texturally immature sedimentary rock.

Conglomerate (geology)

conglomerateconglomeratesconglomeratic
Arkose is often associated with conglomerate deposits sourced from granitic terrain and is often found above unconformities in the immediate vicinity of granite terrains.

Unconformity

unconformablyunconformitiesangular unconformity
Arkose is often associated with conglomerate deposits sourced from granitic terrain and is often found above unconformities in the immediate vicinity of granite terrains.

Australia

AUSAustralianCommonwealth of Australia
The central Australian inselberg Uluru (Ayers Rock) is composed of late Neoproterozoic/Cambrian arkose, deposited in the Amadeus Basin.

Inselberg

monadnockkopjekopjes
The central Australian inselberg Uluru (Ayers Rock) is composed of late Neoproterozoic/Cambrian arkose, deposited in the Amadeus Basin.

Neoproterozoic

Neoproterozoic EraLate NeoproterozoicBaikalian
The central Australian inselberg Uluru (Ayers Rock) is composed of late Neoproterozoic/Cambrian arkose, deposited in the Amadeus Basin.

Cambrian

Cambrian PeriodEarly CambrianLower Cambrian
The central Australian inselberg Uluru (Ayers Rock) is composed of late Neoproterozoic/Cambrian arkose, deposited in the Amadeus Basin.

Amadeus Basin

Amadeus
The central Australian inselberg Uluru (Ayers Rock) is composed of late Neoproterozoic/Cambrian arkose, deposited in the Amadeus Basin.