Volcanic glass (obsidian) is not a mineral because it is not naturally occurring
ID: 113519 • Letter: V
Question
Volcanic glass (obsidian) is not a mineral because
it is not naturally occurring
it does not have a consistent atomic pattern
it contains no oxygen atoms
a and b
b and c
3 points
QUESTION 26
Ions of silicon, iron, calcium and other common elements make the rock-forming minerals. What is an ion?
an atom that is not neutral in electric charge
an atoms that has more neutrons than normal
a man-made chemical compound
a kind of atom found only in continental crust (not in oceanic crust)
3 points
QUESTION 27
Why do silicate minerals make up over 95% of the Earth's crust?
they form a silicon-oxygen tetrahedron
they are based on Si and O ions, both of which are very abundant in the crust
they don't; they make up less than 40% of the crust
none of the above
3 points
QUESTION 28
The rock-forming minerals quartz and feldspar make up most of the continental crust. Which arrangement of the Si-O tetrahedra do these two minerals have?
isolated
single chain
double chain
sheets
frameworks
a.it is not naturally occurring
b.it does not have a consistent atomic pattern
c.it contains no oxygen atoms
d.a and b
e.b and c
Explanation / Answer
Question 25
option d
Obsidian is glass, it is natural and inorganic, but it is amorphous and not crystalline. Therefore it fails one of the 3 key criteria to make it a mineral.
Question 26
option a
an atom that is not neutral in electric charge
Question 27
option a
they form a silicon-oxygen tetrahedron
Question 28
option e frameworks
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