Chapter 26 Flashcards
a naturally occurring inorganic solid with a crystalline form
mineral
the color of a mineral in powdered form
streak
when a mineral breaks along preferred planes of weakness creating sets of smooth parallel sides, it has what?
cleavage
minerals that break with irregular surfaces exhibit what?
fracture
the physical property that measures a mineral’s resistance to scratching
hardness
molten rock material inside Earth
magma
what are the three ways a mineral can form?
hot water, molten rock, and evaporation
a mineral is _____, _____, and _____?
naturally occuring, an inorganic solid, and has a crystalline form
what are the two most abundant elemants that make up Earth’s crust?
silicon and oxygen
what does inorganic mean?
that minerals are materials that are not living
what does the arrangement of an atom and the bonds between them reflect about a mineral?
it reflects the way a mineral breaks, how hard it is, and the crystal shape it has
what are all of the ways to identify minerals?
luster, streak, cleavage, fracture, atomic arrangement, hardness, and crystal shape
what are the two types of luster?
metallic and nonmetallic
how does metallic luster reflect light?
very easily, and like a metal surface
how does nonmetallic luster reflect light?
shines like glass or appears earthy or waxy
how do you preform a streak test?
by rubbing a mineral on an unglazed white porcelain tile
what are the two types of breakage that can happen to minerals?
fracture and cleavage
what is the name of the scale that measures the hardness of a mineral?
the Mohs Scale of Hardness
what is the number range on the Mohs Scale of Hardness?
one through 10
how many different crystal shape systems are there?
there are six
minerals grow from the ____?
surface of Earth
what are the three ways minerals can form?
hot water, molten rock, and evaporation
what are the two mineral groups?
silicates and nonsilicates
which mineral group is the most abundant in Earth’s crust?
silicates
what elements are Silicates made up of?
oxygen and silicon
non-silicates do not contain what element?
silicon
what mineral is used to make glass?
quartz
Define rock
a naturally formed mixture containing minerals, rock fragments, and volcanic glass
how are rocks identified?
by their composition and texture
what does the texture of a rock describe about a rock?
the rock’s size, shape, and arrangement of the rock’s components
where do intrusive igneous rocks form?
molten rock material that cools and crystallizes either underground or on Earth’s surface