Table of Contents
What type of rock contains banding?
metamorphic rock
gneiss, metamorphic rock that has a distinct banding, which is apparent in hand specimen or on a microscopic scale. Gneiss usually is distinguished from schist by its foliation and schistosity; gneiss displays a well-developed foliation and a poorly developed schistosity and cleavage.
What metamorphic rock contains bands?
Gneiss
Gneiss is a foliated metamorphic rock that has a banded appearance and is made up of granular mineral grains. It typically contains abundant quartz or feldspar minerals.
What type of rock has visible mineral bands?
Gneiss is a foliated metamorphic rock identified by its bands and lenses of varying mineral composition. Some of these bands (or lenses) contain granular minerals that are bound together in an interlocking texture.
Which minerals make up the light bands?
Mineralogy – felsic minerals such as feldspar ( orthoclase, plagioclase) and quartz generally form the light coloured bands; mafic minerals such as biotite, pyroxene ( augite) and amphibole ( hornblende) generally form the dark coloured bands; garnet porphyroblasts common.
What is a foliated rock with gneissic banding composed of feldspar mica and quartz?
Texture
| Texture | Characteristics | Rock Name |
|---|---|---|
| foliated (banded) | thin layers of mica | Schist |
| foliated (banded) | thick layers of quartz, feldspar, and mica | Gneiss |
| non-foliated (massive) | welded quartz sandstone | Quartzite |
| non-foliated (massive) | sugary to course crystals, fizzes in HCl acid | Marble |
Where are sedimentary rocks found?
You’re most likely to find sedimentary rocks near sources of water, which is where a lot of erosion takes place. You can find different types in riverbeds, ponds and coasts and throughout the oceans.
What are sedimentary rocks examples?
Common sedimentary rocks include sandstone, limestone, and shale. These rocks often start as sediments carried in rivers and deposited in lakes and oceans. When buried, the sediments lose water and become cemented to form rock.
What type of rock is basalt?
Basalt is a hard, black volcanic rock. Basalt is the most common rock type in the Earth’s crust. Depending on how it is erupted, basalt can be hard and massive (Figure 1) or crumbly and full of bubbles (Figure 2).
Is marble a sedimentary rock?
The main difference between limestone and marble is that limestone is a sedimentary rock, typically composed of calcium carbonate fossils, and marble is a metamorphic rock.
Is Schist a sedimentary rock?
Schist (/ʃɪst/ shist) is a medium-grained metamorphic rock showing pronounced schistosity. Schist can form from many different kinds of rocks, including sedimentary rocks such as mudstones and igneous rocks such as tuffs.
Is Basalt a sedimentary rock?
Basalt is not a sedimentary rock. It is actually an igneous rock formed from cooled, melted rocks.