Earth Science Lab Practical Review
Station 1: Rocks and Minerals COLOR -Least useful property STREAK CLEAVAGE/FRACTURE -Porcelain Streak plate DENSITY/HEFT LUSTER How are Minerals Identified?? -Metallic or Non-metallic CRYSTAL SHAPE HARDNESS -Glass plate INTERNAL ARRANGEMENT OF ATOMS SPECIAL PROPERTIES
STREAK The color of a mineral when finely powdered
LUSTER Metallic – reflects light like metal (shiny) Nonmetallic – any mineral which DOES NOT exhibit shiny metallic characteristics
LUSTER- Now you try… NON-METALLIC
LUSTER- Now you try… NON-METALLIC
LUSTER- Now you try… METALLIC
Hardness Resistance of a mineral to being scratched
Hardness If the mineral SCRATCHES the glass – it has a hardness of 5 or higher. If the mineral DOES NOT SCRATCH glass – it has a hardness of below 5.
CLEAVAGE/FRACTURE Cleavage- when a mineral break along a flat, smooth surface Fracture- when a mineral breaks along an irregular surface
CLEAVAGE OR FRACTURE CLEAVAGE
CLEAVAGE OR FRACTURE CLEAVAGE
CLEAVAGE OR FRACTURE FRACTURE
ROCKS SEDIMENTARY ROCKS -cementation -compaction -fossils -layers -form underwater -pieces and parts of other rocks
ROCKS METAMORPHIC ROCKS -HEAT + PRESSURE! -Foliated -Recrystallization -Banding -Mountains Schist Gneiss
-Solidification of magma or lava ROCKS IGNEOUS ROCKS -Solidification of magma or lava -Glassy -Vesicular -Extrusive -Intrusive Pumice Obsidian Scoria Diorite