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Cementation in science is the process by which particles are glued together by a natural mineral cement. It is commonly found in sedimentary rocks, where loose sediment grains are bound together to form a solid rock through the precipitation of minerals between the grains. This process helps in the consolidation and hardening of sediment into rock over time.
The mineral pyrite has a brassy yellow color in its original form but a black or greenish-black color in its powdered form due to oxidation.
Sandstone is primarily composed of sand-sized grains of mineral or rock particles, typically quartz and feldspar. These grains are usually bound together by a cementing material such as silica, calcite, or iron oxide.
Graphite is the mineral used in pencils.
Gold itself doesn't like to form chemical compounds. That's why there isn't any "gold sulfide" or "gold carbonate" or any other mineral that we mine. Make no mistake, we do mine tons of rock and process it to get out the gold. But that's because the gold is distributed through that rock as really tiny bits. Though gold does form a few compounds, we don't really see it in nature as a mineral. Hope that makes sense, and that it helps.
no texture
no texture
Obsidian cools so quickly the mineral grains do not have time to form.
schist
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.
Pumice does not have grains.
yes
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.
The slower the rate of cooling the larger the size of the crystals that can develop.
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, 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.
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.