Http:// v=wv4M4wror58. ROCK Composed of one or more minerals Classified by 1.Origin – how they...
-
Upload
georgina-barber -
Category
Documents
-
view
214 -
download
1
Transcript of Http:// v=wv4M4wror58. ROCK Composed of one or more minerals Classified by 1.Origin – how they...
http://www.youtube.com/watch?v=wv4M4wror58
ROCK
Composed of one or more minerals
Classified by
1. Origin – how they were formed
2. Mineral Content
3. Texture
ROCK
Composed of one or more minerals
Classified by
1. Origin – how they were formed
2. Mineral Content
3. Texture
IGNEOUS ROCKS
ESRT Page 6http://www.youtube.com/watch?v=aCnAF1Opt8M
Formation
• Solidification of magma• Made up of inter grown mineral crystals
• Environments a. Magma – below ground b. Lava – above ground
a. Texture
Determined by the rate of cooling, refers to the size, shape and arrangement of crystals which grew out of the cooling magma/lava
1. Intrusive
• You can visibly see the ____________
• cooled slowly, deep beneath the Earth’s surface
• large to medium crystals
Mineral crystals
Pegmatite – Very Coarse Texture
Granite - Coarse Texture
2. Extrusive• Very small or no _______________
• cooled quickly on earth’s surface
• glassy to fine (can see with a hand lens) crystals
Mineral crystals
3. Porphyritic
• Contains crystals of two markedly different sizes
• identify with the majority of crystals
4. Vesicular
• Porous from trapped gas pockets
b. Color
Based on the mineral content or what it is made of
Mafic
Dark colored, high in Iron (Fe) and Magnesium (Mg), more dense
Felsic
• Light colored, high in Aluminum (Al) and Silicon (Si), less dense
HOW DO YOU KNOW ITS AN IGNEOUS ROCK
1.Mineral Crystals or
2.Vesicular – Gas pockets
Order in which minerals crystallize from a cooling magma/lava to form igneous rocks