Can you see grains in
the mineral?
Yes
No
Do the grains look
melted together or
interlocked?
Yes
Are the grains in lines,
layers, or rows?
Yes
Gneiss or Schist
Is it soft or smooth
with faint layers?
Yes
No
Do the grains feel silty,
sand, or pebbly?
Yes
No
Granite
No
Siltstone,
Sandstone or
Conglomerate
Shale
Is it dark colored?
Yes
No
No
If it fizzes with acid,
it’s Limestone or
Marble
If glassy, it’s
Quartzite
Is it hard?
Yes
No
Does it break in
thin sheets?
STUDENT’S NAME
PROBABLE ROCK TYPE
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Yes
Coal
No
Slate
Is it glassy?
Yes
Obsidian
No
Basalt or Pumice