quiz 2 Flashcards
true or false, yellowstone marks the end of a continental hot-spot track
true
the tendency of a mineral to break and produce a smooth, carving shell-shaped surface is termed
conchoidal fracture
the mantle is composed entirely of …
molten peridotite
identify the false statement
- formation of table salt is in mineralogic terms, formation of halite
- formation of table salt takes place when a solution becomes saturated
- formation of table salt is an example of solidification melt
- formation of table salt needs a crystal to begin
formation of table salt is an example of solidification melt
identify the false statement:
-Diamonds are brought through the crust in large carrot-shaped structure called pegmatites
–Diamonds have been found in South Africa, India, northwest Canada and the rocky mountains in the united states.
-Diamonds of industrial quality are used as abrasives
-Diamonds that have weathered out of ore bodies can end up in stream gravels
-Diamonds are brought from the mantles to the surface in magma that hardens into kimberlite
Diamonds are brought through the crust in large carrot-shaped structure called pegmatites
gemstones are commonly found in pegmatites wich are igneous rocks that are …
exceptionally coarse grained
the silica terahedron that forms the backbone of all the silicate minerals is composed of silicon and what other element?
oxygen
which of the following minerals is more commonly known as table salt? gypsum, feldspar, halite or quartz
halite
a blakc fine grained tabular intrusion between two layers of horizontal sedimentary rock must logically be a:
basaltic sill
an unknown mineral scartches glass, has only average specific gravity, and shows no cleavage but does show conchoidal fracture. which of the following could it be? Galena, mica, talc , halite or quartz
quartz
define silicates
-are classified on the basis of how the tetrahedrons join and share oxygen atoms
-are a huge category of minerals and include the common minerals quartz and feldspar
-have the sillicon-oxygen tetrahedron as their structural unit
-are a major component of the continental crust
bowen’s reaction series
allows geologist to predict what minerals will be grouped in igneous rocks
what volcanic features is not related to plate boundary magmatism?
Kilauea, Hawaii
solid blocks of wall rocks (sometimes called country rock) may:
-not melt but instead remain as recognizable blocks called xenoliths
-be broken off during a process called stoping
-melt entirely and thus change the chemical composition of the intruding magma
- be broken off by intruding magma
the energy of various crystal has been shown by scientist to improve human healthà6
false
intrusive igneous rocks
cool slowly and are coarse grained
wich of the following is not true about minerals?
-all minerals are compound of more than one element
-all minerals are naturally made
-some minerals are preicipitated by organisms
-all minerals can be expressed as chemical formulas
all minerals are compounds of more than one element
granite
-is felsic in composition
-logically could be found in batholith
-is a phaneritic rock
-is the coarse grained equivalent of rhyolite
the mineral bronze is produced when humans melt copper and tin together
false, bronze is not a mineral
identify the false statement: mafic minerals
-freeze at higher temperature than silic minerals do
-form black or dark-gray rocks
-would be at the top of bowen’s reaction series, crystallizing first out the melt
-are those rich in iron and magnesium
-form rhyolyte and granite
form rhyolyte and granite
after an explosive volcanic eruption on an island, the surrounding sea is full of light-gay floating rock. what must this rock be?
pumice
calcite is a mineral that can constitute oyster shells and in such cases is an example of which mineral formation?
biomineralization
what pair of minerals are polymorphs
graphite and diamond
which mineral group composes more than 90% of the minerals of the continental crust?
silicates
the bedrock of the Columbia River plateau in Oregon and Washington are flood basalts associated with a mantle superplume
true
a rock has a médium-gray, fine grained groundmass with large cystals of plagioclase. true or false : the lava flow that produced was quickly quenched in ocean water
false
identify the false statement: magma moves up towards earths surface
-because the weight of overlying rock creates pressure that squeezes it up
- because its less dense than the surrounding rock
-while some of its dissolved volatiles bubble out of solution
-slowly, working its way up through cracks and narrow conduits
-more quickly as it cools and therefore becomes less viscous and more dense
more quickly as it cools and therefore becomes less viscous and more dense
window glass is not a mineral because it doesnt have crystal lattice structure
true
when you scrape a mineral along a ceramic plate to observe the colour of its powder, you are checking the physical property known as
streak
gold and copper can both be found as native metals
true
