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When a mineral grains in a metamorphic rock do not form layers the rock has a?

no texture


When mineral grains in a metamorphic rock do not form layers the rock has what texture?

no texture


Why is the texture of obsidian is best contain few or no minerals grains?

Obsidian cools so quickly the mineral grains do not have time to form.


What is a type of metamorphic rock in which mineral grains grow and rearrange but do not form layers?

schist


What kind of sediment consists primarily of mineral grains that were eroded from rocks on land?

Detrital sediment consists primarily of mineral grains that were eroded from rocks on land. These mineral grains are transported by wind, water, or ice and eventually settle and accumulate to form detrital sedimentary rocks, such as sandstone or shale.


Does pumic have mineral grains?

Pumice does not have grains.


Do Glassy igneous rocks form when magma cools too fast for mineral grains to grow?

yes


Why does obsidian contain few or no mineral grains?

The material that would normally form mineral crystals does not have time to form a crystalline structure because of very rapid cooling after volcanically erupting into the air or onto the surface. Obsidian is a volcanic glass.


How is the size of the mineral grains affect by the rate at which molten rock material rock?

The slower the rate of cooling the larger the size of the crystals that can develop.


Why do some igneous rock have bigger mineral grains than others?

This is due to the rate of cooling - a slower rate of cooling results in large mineral grains because the molecules had time to maneuver into a crystalline lattice. A faster rate of cooling results in smaller mineral grains because the molecules were locked into place faster and therefore couldn't form the crystalline lattice structures before getting stuck.


When water combines with mineral grains do the grains become smaller or larger?

When water combines with mineral grains, the grains can become smaller due to mechanical weathering processes like abrasion and attrition, where the movements of water cause the grains to break down into smaller pieces. However, in some cases, water can also facilitate processes like dissolution or precipitation that can lead to mineral grains growing larger.


If you found a rock with flat mineral grains which rock would it be?

It is likely a type of metamorphic rock, such as schist or gneiss, which form under high temperature and pressure conditions leading to the alignment of mineral grains into flat layers.