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What type of rock has light and dark layers - Answers.com


foliated. ... What is a type of metamorphic rock that has parallel layers? Foliated rock has parallel layers. .... What rock has parallel bands of dark and light mineral grains?

Rock Key


If there are a lot of pebbles mixed with the sand, it is called gravel. ... Hornblende is usually found in dark colored metamorphic rocks; sometimes in igneous rocks. .... The rock has crystals, layers that look like ribbons or bands of minerals ... The rock is mostly light to medium gray, has crystal grains, and is not layered. It is.

Foliated Metamorphic Rocks | Mineralogy4Kids


Foliated metamorphic rocks are formed within the Earth's interior under ... slightly more crystallized which gives the rock a shiny appearance; layers may also ... and pressures; coarse grained texture of alternating light and dark mineral bands .

Rock and Mineral identification Flashcards | Quizlet


(dark rocks) Extrusive Igneous Rock Color: black or dark. Streak: Layers: ... Color: always going to be grey (light or dark) ... Other: sometimes has bands (stripes) of different colored minerals caused by the reorganization of minerals during ...

Metamorphic Rocks


Metamorphic rocks are consequently rocks that have undergone a change or ... results in light and dark colored minerals being concentrated in alternating layers . ... If these mica minerals grow during deformation, they will be aligned with their ... Each of these minerals has the same chemical composition (Al2 SiO5 ), but ...

Metamorphic Rocks


Distinguish between foliated and non-foliated metamorphic rocks. • Distinguish between ... and the formation of bands or layers of like minerals. METAMORPHIC  ...

Metamorphic Rocks


The light and dark bands (gneissic banding) are alternations of felsic vs. mafic layers. Slate is a product of low grade metamorphism (not terribly great burial ...

Fairly Simple Rock Identification


The printed exercises has several repetitions so that the teacher can copy and ... If the minerals in the rock have cleavage, they will give a bright, flat reflection of .... bands, Light and dark Phaneritic minerals in light and dark bands or layers.

GC5Q70A Rock On ~ A Hunt for Gneiss Rock (Earthcache) in New ...


Mar 27, 2015 ... Our planet has 4 layers: ... Sedimentary rocks if uplifted, weathered and eroded again will form .... This very hard rock is typically characterized by alternating bands of various widths of light and dark colour but bands are not ...

Gneiss - Metamorphic rocks - Sandatlas


Light-colored layer is usually composed of feldspars and quartz. ... banding has nothing to do with original layering of sedimentary rocks. ... It would be logical to assume that dark biotite-rich bands represent metamorphosed muddy layer in a ...

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Metamorphic Rock Classification - faculty at Chemeketa


Foliation refers to flat or wavy planar features (looking like layers) caused by the ... Foliation may also look like alternating bands of light and dark minerals. In contrast, a nonfoliated rock has interlocking grains with no specific pattern. Foliated ...

Igneous Rocks


Both magma and lava cool and harden to form igneous rocks. ... The word " texture" has nothing to do with how the rock feels. ... Depending on the proportion of light minerals to dark minerals, igneous rocks can be broken into four main types: felsic, ... Each layer of sedimentary rock is like a chapter in the history of the e...

Chapter 4 Rocks and Minerals - Volcano World


This layer of rock extends down to 40 miles from the surface of the earth. ... The lava has cooled and is now a volcanic rock called basalt. .... Some minerals sparkle in the light while others are dull and boring! ... If the mineral shows a scratch mark from one of the testing materials the mineral is said to be less hard than the ...