Download 6B20 Identifying Rock Types

6B20 Identifying Rock Types
B20 Rock Type Background
• Ranger Ormond examined the hiker’s rock.
Was it an igneous rock like kimberlite?
Igneous, metamorphic and sedimentary rocks
often look different from each other because
they are formed differently.
• She wanted to compare the hiker’s rock to
samples of metamorphic, sedimentary and
igneous rocks. Can you help her figure out
which rock is which?
B20 Rock Type Procedure
• On separate paper put Name, Hour, and Date.
• Make a 3-column data table with 9 rows and
titles: Name, Observations, Rock Type (I,S,M)
• Use a magnifying lens to examine some rock
samples and record observations in a table
• Check color, hardness, smoothness, streaks, &
compare crystal sizes as small · or large •
• Compare the rocks to Vocab Rock Properties
• Are they Igneous, Sedimentary, or Metamorphic?
B20 Rock Type Data Table (copy)
Rock Name
• Coal
• Gabbro
• Gneiss
• Granite
• Limestone
• Obsidian
• Phyllite
• Sandstone
Observations
Type (I,S,M)
B20 Rock Type Data Table: Obs
Rock Name
• Coal
• Gabbro
• Gneiss
• Granite
• Limestone
• Obsidian
• Phyllite
• Sandstone
Observations
Type (I,S,M)
Black layers, light, crumbly
?
Dark, shiny, large crystals
?
Color bands, small crystals
?
Large red crystals
?
White/rose, soft, fossils
?
Black shiny, hard, smooth as glass ?
Gray bands, small crystals
?
Sand texture, crumbly
?
B20 Rock Type Analysis: Date________
Name______________________ Hr__
Copy and Explain each in 1 paragraph.
1. Do all rocks of the same type look the same?
2. What characteristic is most useful to identify
each type of rock listed below? Explain.
A. igneous B. sedimentary C. metamorphic
3. Which fact is most helpful in identifying an
unknown rock and why? A) It is light gray, B) It is
shiny, C) It was found high up on an extinct volcano,
or D) It can easily fit in a kid’s hand.
B20 Rock Type
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