HCCS-NORTHWEST
COLLEGE
PHYSICAL GEOLOGY 1403
METAMORPHIC ROCKS
SLATE
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•
•
•
FOLIATED TEXTURE
LOW-GRADE
SLATY CLEAVAGE
PARENT ROCK:
SHALE
• CLAY COMPOSITION
SCHIST
•
•
•
•
•
FOLIATED TEXTURE
INTERMEDIATE GRADE
SCHISTOSITY
PARENT ROCK: SHALE
CLAY COMPOSITION
GNEISS
•
•
•
•
FOLIATED TEXTURE
HIGH-GRADE
GNEISSIC LAYERING
PARENT ROCK:
DIORITE
• PLAGIOCLASE, QTZ,
MICA
MARBLE
• NONFOLIATED
TEXTURE
• HIGH-GRADE
• PARENT ROCK:
LIMESTONE
• CALCIUM
CARBONATE
QUARTZITE
• NONFOLIATED
TEXTURE
• HIGH-GRADE
• PARENT ROCK:
SANDSTONE
• QUARTZ
COMPOSITION
METACONGLOMERATE
• NONFOLIATED
TEXTURE
• HIGH-GRADE
• PARENT ROCK:
CONGLOMERATE
• QUARTZ
COMPOSITION