Rocks and Minerals Flashcards
aggregate of one or more minerals.
Rock
building blocks of rocks.
Minerals
Mineral is…
naturally occurring,
inorganic solid with ____ and ____
definite chemical composition and orderly crystalline structure
Substances that fulfil all the
requirements but do not
have a crystalline structure
are called
mineraloids
WHERE DO MINERALS COME FROM? (2)
1) From stuff
dissolved in liquids
2) From Cooling
molten material
if crystals are large?
Magma cools slowly
if Magma cools quickly?
crystals are small
The cooling of hot, liquid
rock called __ causes
compounds to combine
MAGMA
Extrusive” Cooling
Lava cools Fast
“Intrusive” Cooling
Magma cools slowly
Describes how light is reflected
from a mineral’s surface
LUSTER
EXAMPLES OF MINERALS FORMED BY EVAPORATION
Halite (salt) for food
*Graphite (pencil) for writing
*Diamond for jewelry
Amethyst
Galena
Calcite
Gold
Pyrite
two types of luster
metallic (shiny)
Nonmetallic (glassy, pearly,
greasy, dull)
is the natural, external color of the mineral
Color
color of the mineral in powered
form
Streak
Resistance of
mineral to
abrasion or
scratches.
HARDNESS