Post on 13-Jan-2016
Chapter 2, Section 2How Minerals Form
Chapter 2, Section 2How Minerals Form
Friday, October 23, 2009Pages 56 -- 60
Friday, October 23, 2009Pages 56 -- 60
ObjectiveObjective
Describe the processes by which minerals form.
Describe the processes by which minerals form.
Vocabulary WordsVocabulary Words
Magma Lava Solution Vein
Magma Lava Solution Vein
Processes That Form Magma
Processes That Form Magma
Minerals can form in two ways: Through crystallization of melted
materials. Through crystallization of materials
dissolved in water. Crystallization is a process where
atoms are arranged to form a material with a crystal structure.
Minerals can form in two ways: Through crystallization of melted
materials. Through crystallization of materials
dissolved in water. Crystallization is a process where
atoms are arranged to form a material with a crystal structure.
Mineral from MagmaMineral from Magma
Magma is molten material that hardens to form rock.
Lava is magma that reaches the surface.
When lava cools, it hardens and forms rocks.
Magma is molten material that hardens to form rock.
Lava is magma that reaches the surface.
When lava cools, it hardens and forms rocks.
Mineral from Magma -- Cont’d
Mineral from Magma -- Cont’d
Crystals form when lava cools and turns from a liquid to solid state.
The size of the crystals depend on: How fast the magma cools. The amount of gas the magma
contains. The chemical composition of the
magma.
Crystals form when lava cools and turns from a liquid to solid state.
The size of the crystals depend on: How fast the magma cools. The amount of gas the magma
contains. The chemical composition of the
magma.
Minerals from Magma -- Cont’d
Minerals from Magma -- Cont’d
Magma closer to the surface cools faster yielding smaller crystals.
Magma deep below the surface cools slowly yielding larger crystals.
Magma closer to the surface cools faster yielding smaller crystals.
Magma deep below the surface cools slowly yielding larger crystals.
QuickTime™ and aTIFF (Uncompressed) decompressor
are needed to see this picture.
Spodumeme crystal can be as large as the size of a telephone pole!
Minerals from Hot Water Solution
Minerals from Hot Water Solution
A solution is a mixture in which one substance dissolves in another.
When hot water begins to cool, the elements and compounds leave the solution and crystallize to form minerals.
A solution is a mixture in which one substance dissolves in another.
When hot water begins to cool, the elements and compounds leave the solution and crystallize to form minerals.
QuickTime™ and aTIFF (Uncompressed) decompressor
are needed to see this picture.
Silver as a pure metal -- delicate, treelike crystals are formed.
VeinsVeins
A vein is a narrow channel or slab of mineral that’s different from the surrounding rock.
Occurs when pure metals crystallize underground from hot water solutions.
A vein is a narrow channel or slab of mineral that’s different from the surrounding rock.
Occurs when pure metals crystallize underground from hot water solutions.
QuickTime™ and aTIFF (Uncompressed) decompressor
are needed to see this picture.
Minerals Formed by Evaporation
Minerals Formed by Evaporation
Minerals can form from evaporation of a solution.
Minerals can form from evaporation of a solution.
QuickTime™ and aTIFF (Uncompressed) decompressor
are needed to see this picture.
Salt crystals
Where Minerals are FoundWhere Minerals are Found
Minerals can be found on the Earth’s crust.
These minerals are not distributed evenly.
There are areas of concentration for minerals.
Minerals can be found on the Earth’s crust.
These minerals are not distributed evenly.
There are areas of concentration for minerals.
QuickTime™ and aTIFF (Uncompressed) decompressor
are needed to see this picture.
HomeworkHomework
Workbook 2.2 due on Wednesday, 10-28.
Vocabulary quiz on 2.2 on Wednesday, 10-28.
Workbook 2.2 due on Wednesday, 10-28.
Vocabulary quiz on 2.2 on Wednesday, 10-28.