Igneous
What do igneous form from?
Hot liquid.
wavy bands of light and dark minerals visible in gneiss bedrock formed by?
heat and pressure
How do sedimentary rocks form?
When existing rocks are broken down into sediments
what rock has a black streak and greasy feel?
Graphite
What rock has a hardness of 2.5, cleavage, metallic silver, gray-black streak, and is used for lead and batteries?
Galena.
What are two types of igneous rock textures?
Glassy and Porphyritic.
metamorphism results in the alignment of crystals known as?
foliation
what components are sedimentary rocks classified by?
Clastic, Organic, and chemical.
What rock bubbles with acid when powered?
Calcite
What rock has a hardness of 3.5, no color, bubbles with acid when powdered, and is used for building stones?
Dolomite.
What texture does slow cooling cause?
Coarse grain.
Metamorphic sometimes causes minerals to separate into light and dark layers this is called?
Banding
What is compaction?
It is caused by the weight of sediments.
What rock cleaves in 2 directions, striations visible?
Plagioclase feldspar
What rock has a hardness of 7, has no color, glassy luster, forms hexagonal crystal, and is used for glass jewelry and electronics.
Quartz.
What is the size of the crystal determined by?
Rate of cooling.
What metamorphism is when rocks are altered at or near Earth’s surface, as the result of contact with magma or lava
Contact Metamorphism
During compaction what is driven out?
Water.
What rock is often seen as red glassy grains in NYS metamorphic rock?
Garnet
What rock has a hardness of 2.5, is colorless-white, has a cubic cleavage and salty taste, and is used as a food additive and melts ice.
Halite.
Name all of the extrusive igneous rocks.
Obsidian, Pumice, Rhyolite, Andesite, Basalt, and Scoria.
What rock has the composition of the mineral mica, has a fine grain size and has foliated texture?
Shale
What takes place when dissolved minerals are deposited in the tiny spaces among the sediments?
Cementation
pyroxene
What rock has a hardness of 5.5, is black-dark green, cleaves at 56° and 124°, and is used for mineral collections and jewelry.
Amphibole.