- What are the features of schist?
- Why is Mica shiny?
- Where is schist found?
- What type of rock is schist?
- Is Schist a regional or contact?
- What is the texture of schist?
- Where do you find gold in a rock?
- Is gold found in metamorphic rock?
- Is granite a schist?
- What does schist mean?
- What color is schist?
- What can schist turn into?
- Does MICA have gold in it?
- How old is mica schist?
- What is the most likely Protolith of schist?
- What are the two types of metamorphic textures?
- Is gold found in schist?
What are the features of schist?
Schist has a flat, large and sheet-like grains and It have flat and elongated minerals such as talc or micas.It has quartz and feldspar minerals are intertwined.
These lamellar (flat, planar) minerals include micas, chlorite, talc, hornblende, graphite, and others.
Banding in it is typically poorly developed..
Why is Mica shiny?
Mica minerals! … They sparkle because light is reflected on their flat surfaces, which are where the mineral breaks along its plane of cleavage. These minerals break so easily along their cleavage that some crystals have broken into many thin layers that look like the pages of a little book.
Where is schist found?
Schist can be found in many countries including Brazil, parts of the US and Ireland. Schist has been previously used to make decorative rock walls. Presently, schist is used as a decorative stone as well as for jewelry.
What type of rock is schist?
Schist is a type of metamorphic rock in which lamellar minerals, such as muscovite, biotite, and chlorite, or prismatic minerals, such as hornblende and tremolite, are oriented parallel to a secondary platy or laminated structure termed the schistosity.
Is Schist a regional or contact?
Most foliated metamorphic rocks—slate, phyllite, schist, and gneiss—are formed during regional metamorphism. As the rocks become heated at depth in the Earth during regional metamorphism they become ductile, which means they are relatively soft even though they are still solid.
What is the texture of schist?
Texture – foliated, foliation on mm to cm scale. Grain size – fine to medium grained; can often see crystals with the naked eye. Hardness – generally hard. Colour – variable – often alternating lighter and darker bands, often shiny.
Where do you find gold in a rock?
Gold is most often found in quartz rock. When quartz is found in gold bearings areas, it is possible that gold will be found as well. Quartz may be found as small stones in river beds or in large seams in hillsides.
Is gold found in metamorphic rock?
Gold usually comes detachment veins hosted in metamorphic rocks such as quartz and slate which being eroded by floods igneous type (basalts, peridotites, andesites, granites, breccias and other large volume of coarse grains especially) that although gold is not specifically formed igneous bedrock drag him to these …
Is granite a schist?
In some cases, schists are lumped in with slates and phyllites. This is especially true if the stone breaks into flat layers or if the mica grains are small. Some types of schist are commercially categorized as granite. This is likely if it’s leaning more toward gneiss on the metamorphic spectrum.
What does schist mean?
: a metamorphic crystalline rock that has a closely foliated structure and can be split along approximately parallel planes.
What color is schist?
Garnet-Mica SchistTypeMetamorphic RockCompositionMuscovite, Biotite, Garnet, Quartz, FeldsparIndex MineralsGarnetColorShiny, medium grayMiscellaneousSmall-sized dark red-brown garnets on foliation surfaces5 more rows
What can schist turn into?
At that point the rock can be called a “phyllite.” When the platy mineral grains have grown large enough to be seen with the unaided eye, the rock can be called “schist.” Additional heat, pressure, and chemical activity might convert the schist into a granular metamorphic rock known as “gneiss.”
Does MICA have gold in it?
Yes you can find gold in rivers that have mica but it will not be on top. Gold is one of the heaviest things in the river. … Mica is really a whole host of minerals, muscovite, biotite and chlorite being the most common.
How old is mica schist?
Mica schist is a metamorphic rock that formed through the intense heat and pressure that were generated when Africa and North America slammed together to create Pangaea, about 275 million years ago.
What is the most likely Protolith of schist?
The protolith of schists can be igneous (e.g. basalt, volcanic tuff) or sedimentary (clay, mud).
What are the two types of metamorphic textures?
TEXTURES Textures of metamorphic rocks fall into two broad groups, FOLIATED and NON-FOLIATED.
Is gold found in schist?
Pyrite is far more common than gold in schists or phyllites. … It is worth noting that many pyrite (and other sulfide) deposits also carry a miniscule percentage of gold as microscopic grains in amoung the sulfide mineral grains.